JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2022
·Vol. 147
·期 23
·13351-13361
·
IF 4.755
Shi Yanqin,Chen Lukai,Ma Biao,Lu Songyan,Chen Si,He Huiwen,Ma Meng,Wang Xu
An excellent migration resistant thermal stabilizer, an oligomer of bis-uracil derivative (P-UESU), was synthesized by the polymerization of UESU. The UESU was obtained by the reaction of 10-undecenyl aldehyde and 6-amino-1,3-dimethyluracil (DAU). The results of FTIR, DSC, and MS indicated that UESU and P-UESU were synthesized successfully, and P-UESU was an oligomer with more than four polymerization degrees. P-UESU could be used as the thermal stabilizer for PVC due to its high thermal stability. The super low migration ratio of P-UESU in PVC was proved by the migration resistant test, which is lower than 0.2%, better than OSU, USU, and commercial Ca/Zn thermal stabilizers. The reasons were ascribed to its big molecular volume and the physical entanglement with PVC molecular chains, which was confirmed by Flory–Huggins theory. Moreover, the static and dynamic thermal stability time of PVC with P-UESU/ESBO/TPP reached more than 160 min and 41 min, respectively. It was interesting that the excellent migration resistance of P-UESU was not affected by the addition of the auxiliary thermal stabilizers. The tensile strength and elastic modulus of PVC were also high, which were 26.93 MPa and 28.85 MPa. In conclusion, P-UESU had a good application prospect in practical application due to its excellent migration resistance and good thermal stability effect on PVC.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2024
·
IF 7.2
Sifan Chen,Tingting Zhao,Peiyuan Li,Shuanjin Wang,Dongmei Han,Sheng Huang,Wei Liu,Zhiheng Huang,Min Xiao,Yuezhong Meng
A completely new poly(carbonate-ester) macrodiol (PPCP-mDL), derived from direct copolymerization of carbon dioxide (CO 2 ), propylene oxide (PO), phthalic anhydride (PA) and 1, 4-butanediol (BDO) catalyzed by metal-free triethylborine (TEB)/1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) pairs has been developed. The molecular weight of PPCP-mDL produced varying from 1.1–2.3 kg mol −1 can be easily controlled through the regulation of reaction conditions. For the formulation of non-toxic, phthalate-free flexible PVC, novel and biodegradable ec-PPCP-mDL with high molecular weight may be obtained through end-capping the PPCP-mDL using benzoyl chloride. The ec-PPCP-mDL/PVC blends display better comprehensive plasticization performance than do comparable blends with commercial DEHP plasticizers. These blends exhibit high thermal stability, mechanical properies, plasticizer migration resistance and transmittance. The interaction between ec-PPCP-mDL and PVC has been characterized using FTIR spectroscopy. A possible mode of plasticization has been suggested. The rich ester groups in the structure of ec-PPCP-mDLs interact well with PVC via hydrogen bonding, resulting in excellent compatiblity with PVC. Overall, the novel ec-PPCP-mDL material, respects an attractive alternative to plasticizers as a green, non-toxic, biodegradable, partially sustainable for the preparation of flexible PVC formulations.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2013
·
IF 2.404
Zhenning Yan,Shuangqiang Wang,Haixia Wang,Shuangyan Wu
Two Bi 3 + selective electrodes based on L1 and L2 incorporated into a polyvinylchloride (PVC) membrane have been developed. The ionophores L1 and L2 are 2-(5-amino-1,3,4-thiadiazol-2-ylthio)-N′-benzylidene acetohydrazone and 1-(2-(5-amino-1,3,4-thiadiazol-2-ylthio) acetyl)-4-benzoylthiosemicarbazone, respectively. These electrodes are composed of dioctylphtalate (DOP) as a plasticizer and sodium tetraphenylborate (NaTPB) as the lipophilic additive. The best performance was obtained with the membrane compositions of L1 (0.30): PVC (33.22): DOP (66.36): NaTPB (0.12) (%, w/w) and L2 (1.00): PVC (33.00): DOP (65.91): NaTPB (0.09) (%, w/w). Two membrane electrodes show Nernstian response slopes towards Bi 3 + (20.2 and 19.7 mV/decade, respectively) over the concentration range of 10 − 7 –10 − 3 and 10 − 7 –10 − 2 M, respectively. The effects of the pH and the possible interfering cations were investigated. Both electrodes have a response time of about 10 s, and they can work in a certain concentration aqueous ethanol solution. The prepared electrodes were used as an indicator electrode in potentiometric titration of Bi 3 + ions with EDTA. The membrane sensors were also applied to the determination of Bi 3 + content in compound bismuth aluminate tablets.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·
IF 3
Zou Yanyan,Pau Dennis,Yi Linlin,Li Yaoqiang,Li Kaiyuan
13X zeolite–calcium oxide (CaO) composite capture agent application in the pyrolysis recovery of polyvinyl chloride (PVC)-based waste cables was investigated in this research to elucidate the agent’s efficiency in capturing chlorine (Cl) and carbon (C) during pyrolysis. The 13X zeolite–CaO mixture is subjected to separate pyrolysis of the PVC-based cable outer sheath in experimental furnaces of simulated solar-powered and thermogravimetry. Subsequently, a range of spectroscopic techniques are employed to quantitatively analyze the gaseous and solid products resulting from the pyrolysis process. Through X-ray fluorescence, total carbon, and other analyses, the research outcomes demonstrated that the capture agent exhibits superior Cl and C capture performance compared to using a single agent for plastic pyrolysis. The yield of Cl element in the solid residue has increased significantly by 130–140% under the presence of optimized composite capture agent. By determining the dynamic changes of gaseous and solid products during the cable outer sheath pyrolysis, the influence of the capture agent on the redistribution and transformation mechanisms of Cl and C elements was identified, and it was found that contaminating volatiles were well immobilized in the solid residue. This research provides a new solution for efficient Cl and C capture in the pyrolysis recovery of waste cables and determines the fixation and transformation mechanisms of Cl and C elements by the composite capture agent, indicating a potential for feasible and sustainable resource utilization of waste cables.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Zaheen Ullah Khan,Wasid Ullah Khan,Bakhtar Ullah,Wajid Ali,Bilal Ahmad,Wajid Ali,Pow-Seng Yap
Due to the rapid industrialization, heavy metals contamination in the aquatic environment has become more serious. Thus, it is urgent to develop enhanced removal technology for heavy metals. Graphene oxide (GO) based composite paper-like materials have been widely applied for adsorption of heavy metals from wastewater. Herein, we fabricated for the first time an advanced, highly-ordered and homogenous PVC/PPD/GO paper-like material using a resin-infiltration technique. This process is complimentary to layer-by-layer assembly, where the assembling components are required to interact strongly (e.g., via hydrogen bonding or electrostatic attraction). The results showed that the composite papers could achieve high removal efficiency of the heavy metals from water. The amount of Pb(II) adsorbed at equilibrium as achieved by GO, PVC/GO-0.05, PVC/GO-0.08, PVC/PPD/GO-0.05 and PVC/PPD/GO-0.08 buckypapers were 17.61, 22.17, 25.41, 33.57 and 44.80 mg g −1 , respectively. In addition, the effects of experimental factors (e.g. GO content, ionic strength of heavy metal ions , temperature and solution pH) on heavy metal adsorption were discussed. Furthermore, the as-prepared PVC/PPD/GO-0.08 composite papers exhibited superior stability and could be recycled more than 900 h based on their 15 regeneration cycles. The improved heavy metal removal efficiency was attributed to the enhanced morphology and the formation of micro- and nano-channels created by the entangled PPD/GO. The findings indicated that the PVC/PPD/GO composite buckypapers could be used as promising materials for the adsorption of heavy metals from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2016
·
IF 3.12
Mei Wang,Jianling Xia,Jianchun Jiang,Shouhai Li,Kun Huang,Wei Mao,Mei Li
A novel liquid Ca/Zn thermal stabilizer was synthesized from tung-maleic anhydride (TMA) as feedstock and evaluated for its stabilizing effects on poly (vinyl chloride) (PVC). First, N -(3-amino-benzoic acid) tung-maleamic acid (ABTMA) was prepared from the ammonolysis of TMA and para -aminobenzoic acid (PABA). Then its complex calcium salt (ABTMA-Ca) and zinc salt (ABTMA-Zn) were synthesized through a one-step method, and investigated by Fourier transform infrared spectroscopy and elemental analysis . ABTMA-Ca and ABTMA-Zn were separately treated with diethylene glycol monobutyl ether at 120 °C for 3 h to form liquid ABTMA-Ca (LABTMA-Ca) and liquid ABTMA-Zn (LABTMA-Zn). The effects of LABTMA-Ca/LABTMA-Zn, CaSt 2 /ZnSt 2 and C36DA-Ca/C36DA-Zn on thermal stability of PVC were studied through Congo Red test, discoloration tests and dynamic thermal stability analysis. The LABTMA-Ca/LABTMA-Zn thermal stabilizer exhibit excellent long-term stability. Analysis of tensile and dynamic mechanical properties shows PVC samples stabilized with LABTMA-Ca/LABTMA-Zn and the other two Ca/Zn systems all display comparable strength , modulus and glass transition. A common stabilizing mechanism of LABTMA-Ca/LABTMA-Zn system and its radical mechanism were presented, respectively.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Ming Yong,Yuqing Zhang,Shuai Sun,Wei Liu
Usually seen as a waste with low chemical value and limited commercial potential, lignin produced in large quantity from paper industry performs abundant valuable hydrophilic groups which make it a potential hydrophilic assistant. In this contribution, in order to improve hydrophilicity and antifouling properties of PVC ultrafiltration membrane, lignin was doped into PVC to prepare a uniform sol under strengthening heat and mass transfer process, and then PVC/lignin ultrafiltration membranes were prepared via phase inversion strategy. The resulted PVC/lignin ultrafiltration membranes were characterized by SEM, FT-IR, XPS , DSC and were also tested by oily wastewater. According to the results of SEM, XRD and DSC analyses, PVC is compatible with lignin and the homogeneous PVC/lignin sol can be formed. The hydrophilicity of membrane is significantly enhanced with water contact angle (WCA) decreasing from 106.73° to 41.53°. Particularly, the PVC/lignin ultrafiltration membranes exhibit attractive properties with oil rejection of 97.36% and oily wastewater permeation flux of 156.55 L m −2 h −1 (0.1 MPa), nearly 2.5 times that of pure one (65.06 L m −2 h −1 ). Lignin suggests to be a superior additive to improve hydrophilic and anti-fouling properties of PVC membranes, and the lignin-modified membranes are promising candidates for cleaning oily wastewater and sewage.
研究领域:
材料科学
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膜技术
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高分子科学
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环境工程
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化学工程
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Fu-Rong Xiu,Xue Bai,Yingying Qi,Xiang Gao,Man Zhao
Pesticide residues in agricultural products are serious threat to people's health. Real-time monitoring of pesticides residues in the environment and agricultural products posed challenges to sustainable methods with high analytical performance for pesticide detection. Herein, waste PVC/coal fly ash (the mass ratio of PVC and coal fly ash was 4:1) was dechlorinated in subcritical water at low temperature to achieve nearly 100 % dechlorination of PVC and obtain carbon-based composite materials (CM-Fe/Al/Si-dPVC) with strong sening activity. For CM-Fe/Al/Si-dPVC, C Fe bonding resulted in strong electron migration, and nano/μm SiO 2 and Al 2 O 3 doping in the layered polyene C matrix provided large specific surface area , and silicon hydroxyl created good heterogeneous catalytic interfaces. CM-Fe/Al/Si-dPVC could strongly trigger luminol chemiluminescence (CL) reaction and produce intense CL signals. Neonicotinoid pesticides (acetamiprid and imidacloprid) bonded with CM-Fe/Al/Si-dPVC through coordination chelation and hydrogen bonding , which shielded the catalytic active site and increased the Fermi level of system, thus quenching CL reaction. Inspired by these, a cheap CL assay was constructed for detecting neonicotinoids combinations of acetamiprid and imidacloprid (NICs). The detection limits of NICs were 0.7 ng/L. Satisfactory recoveries were obtained for real agricultural products and environmental samples. The results of life cycle evaluation (LCA) revealed that the strategy had significantly small global warming potential (GWP). This work presented a sustainable method with environmental benefits for the detection of neonicotinoids, and also opened up new way for the recycling of organic solid wastes .
研究领域:
环境科学
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分析化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2021
·
IF 4.43
Chao Wang,Xipeng Song,Yawei Liu,Chunhua Zhang
Polyorganosiloxane (silicone)-contaminated wastewater is a typical chemical wastewater that causes serious environmental pollution, is difficult to treat and has a high separation cost due to its toxicity, high chemical stability, and low surface tension. To liminate this pollution, a low-cost ultrafiltration membrane with excellent separation properties was successfully fabricated. First, to prepare the membrane, an amphiphilic polymer of poly(vinyl chloride)-g-poly(vinyl pyrrolidone) (PVC-g-PVP) was synthesized by atom transfer radical polymerization (ATRP) over an inexpensive catalyst/ligand system of CuCl/benzyl dimethylamine (BDMA). Thereafter, the membrane was fabricated by regulating the aggregation of the PVC-g-PVP amphiphilic polymer in its casting solution by increasing the solution temperature. The surface smoothness and hydrophilicity of the resulting PVC-g-PVP membrane were better than those of the pristine PVC membrane. Furthermore, the separation and anti-fouling performances of the resulting membrane for silicone-contaminated wastewater were better than those of the pristine PVC membrane. The permeation flux presented an increment of approximately 233%, with a silicone rejection rate was of approximately 100%, and the flux recovery ratio of approximately 72.7% after three cycling tests, which was an increase of approximately 423%. The integration of inexpensive BDMA was used as ligand for the synthesis of PVC-g-PVP, and hydrophilic PVC-g-PVP membrane was fabricated by regulating the aggregation of the PVC-g-PVP in solution, this work provided a new way for the fabrication of amphiphilic polymer membrane with potential application in chemical wastewater remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Shibo Liang,Lutao Peng,Qin Yi,Zhi Huang,Yanbin Luo,Zixuan Yang,Jinpeng Zhu,Bart Van der Bruggen,Lelin Zeng
Conventional polymer inclusion membranes (PIMs) exhibit suboptimal mechanical properties. Consequently, new composite PIMs were prepared by a modified solvent evaporation method using a PTFE base membrane, a PVC polymer, and an organic phosphonate extractant. Their chemical compositions and microstructures were analyzed by ATR-FTIR and FESEM. The mechanical and mass transfer properties of the composite PIMs were systematically investigated. The composite PIMs exhibited significantly higher tensile strength (36.86 MPa to 52.77 MPa), reduced tensile strain (76.49 % to 118.49 %), and enhanced bursting strength exceeding 0.2 MPa, compared to conventional PIMs. The Zn 2+ /Cu 2+ were separated with a high separation coefficient of 2003.19 by a retardant-enhanced composite PIM system. A new mass transfer model was developed by analyzing the multilayered structure of composite PIMs in depth. The apparent diffusion coefficient of Zn 2+ within PTFE-PVC composite layer (7.76 × 10 −14 m 2 /s) was found to be lower than that within polymer inclusion layer (3.18 × 10 −13 m 2 /s). The optimal regions of polymer inclusion layer thickness, contact area, and time were selected by model calculation for a certain separation task (e.g., purity ≥ 0.97 and yield ≥0.80 for Zn 2+ or Cu 2+ ). Finally, the retardant-enhanced composite PIMs were successfully used for selective separation of several other transition metal ions.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2021
·
IF 5.03
Yanqin Shi,Songyan Lu,Biao Ma,Si Chen,Meng Ma,Huiwen He,Xu Wang
A bis-uracil derivative with a long aliphatic chain of 11 carbon atoms, USU-C, was synthesized by an optimized method. The migration rate test indicated that USU-C had better migration resistance compared to OSU. This advantage enabled the PVC samples containing USU-C to maintain good transparency and low haze for a long time. It had also been proven USU-C has better thermal stability and whiteness retention than OSU by the thermal stability tests. Based on summarizing this work and our previous studies, a new design method was proposed to enhance the transparency and thermal stability effect of thermal stabilizers on PVC based on Hansen solubility parameters (HSP) theory. Impressively, the quantitative mathematical function between the HSP and the carbon atom number in the long aliphatic chain of bis-uracil derivatives was also derived, which could be used to guide the structure design of new bis-uracil derivatives with long term migration resistance, preeminent transparency, and high thermal stability for PVC in the follow-up study, even other organic thermal stabilizers.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 26
·e05212
·
IF 2
Yan Jiang,Yue Sun,Jie Zhang,Hongmei Zhao,Changhai Xu,Jinmei Du,Luyue Jia,Dagang Miao
Graphical In this study, we synthesized an anionic polyacrylate water repellent and for the first time utilized it to enhance the moisture permeability in PVC/EVA membranes. The common polyvinyl chloride (PVC) gloves affect moisture and air permeability due to their dense nature, affecting the wearing comfort. Inspired by moisture-permeable fabrics, this study was conducted to enhance the moisture permeability of PVC/EVA membranes by introducing ethylene vinyl acetate copolymer (EVA) blended with PVC to form a membrane and coating one side of the membrane with a polyacrylate water repellent. The experimental results showed that the water contact angle of the upper (85°) and lower surfaces (99.4°) of the PVC/EVA membrane produced a significant difference. This difference endows the membrane with different wettability.The water vapor transmission of the membranes increased from the initial 163.25 g/m 2 ·24h to 862.9 g/m 2 ·24h. The moisture permeability and thermal conductivity of PVC/EVA membranes were significantly improved. After 30 min in the thermal conductivity test, the temperature of the palm covered with PVC/EVA membranes reached 34.7 °C, which was 0.8 °C higher than that of the palm covered with pure PVC membranes. The SEM images show that the PVC/EVA membrane generated more particles and pores. The results of XRD, TG/DTG, and tensile tests showed that the crystal structure and mechanical strength of the membranes remained unchanged, while their thermal stability improved.
研究领域:
高分子科学
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材料工程
·
表面化学
·
热分析
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）