Materials Research Express
·
2020
·Vol. 7
·期 2
·026407
·
IF 1.929
Dashuai Zhang,Yan Zhang,Xiaopeng Zhang,Chen Li,Lili Wang,Tianyi Shun,Hongting Wu,Qiang Lin,Zaifeng Shi
In this study, novel physical blending modified membranes are prepared using the non-solvent induced phase separation method, the influences of nano-graphite and Poly(vinyl chloride) (PVC) incorporated into the hydrophobic performance of the polyvinylidene fluoride (PVDF) membrane were investigated. The composite membrane was prepared not only reduces the cost of producing PVDF membrane, but also enhances the hydrophobicity of the membrane. The addition of nano graphite and PVC accelerated the phase transformation of PVDF and changed the crystal structure of PVDF. Therefore, the surface roughness of the composite membrane is changed, and the hydrophobicity of the composite membrane is enhanced compared with the original PVDF membrane. the crystal structure and crystallinity of the composite membranes can be analyzed by WAXD and DSC, the surfaces morphology of the composite membranes were characterized by SEM and AFM, the wetting and hydrophobicity of the composite membrane by CA and SFE. The experimental results show that adding a small amount of nano inorganic substance (nano graphite) to the (PVDF-PVC) blend polymer is an effective method to prepare and improve the hydrophobic performance of the blend polymer membrane. The PVDF-PVC/nano-graphite prepared in the experiment not only improves the hydrophobic performance of the PVDF membrane, but also reduces the cost of the composite membrane through the addition of PVC. Meanwhile, the membrane has a durable self-cleaning performance, which widens the applications of PVDF membranes.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Wanjing Zhang,Liyan Wang,Yunsheng Chong,Wei Liu,Xin Qian
In this study, the copolyester plasticizers PHNAZ, synthesized from azelaic acid and hexanediol and modified by neopentyl glycol (NPG), was prepared via direct esterification. A series of characterization tests revealed that the number-average molecular weight of the PHNAZ copolyester plasticizers was less than 2000 with a dispersion coefficient of less than 2, demonstrating excellent thermal stability below 250 °C. PVC samples plasticized with PHNAZ showed thermal degradation temperatures above 250 °C, reduced glass transition temperatures to −33 °C, and significantly improved hydrophilicity. Notably, the water contact angle of PHNAZ-50/PVC was smallest, averaging 53.956°. The highlight of the study is the cytotoxicity testing of the prepared PHNAZ copolyester plasticizer at concentrations of 1 μg/mL, 10 μg/mL, and 50 μg/mL, where the average cell survival rate exceeded 100 %, indicating excellent biocompatibility. Additionally, PHNAZ displayed outstanding plasticizing effects, particularly PHNAZ-20/PVC, which achieved an elongation at break of 913.6 % and a plasticizing efficiency of 260.0 %. These results suggest that PHNAZ not only excels in chemical and thermal properties but also exhibits good biocompatibility and high plasticizing capability, indicating broad application prospects.
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 5
·e53412
·
IF 3.057
Xin Yang,Xiao Ma,Jingjing Yuan,Xia Feng,Yiping Zhao,Li Chen
Inorganic nanoparticles (NPs) have been employed in modification for polyvinyl chloride (PVC) membrane intrinsic hydrophobicity. Carboxymethyl chitosan (CMC), a natural organic matter, was used to relieve the agglomeration of zinc oxide (ZnO) NPs in the membrane matrix. In this paper, ZnO-CMC NPs were successfully prepared via co-precipitation approach, blended with PVC membranes, and the effect of ZnO-CMC NPs for the membrane properties was studied. The SEM and EDX confirmed excellent dispersion of ZnO-CMC NPs on the membrane surface. The enhanced hydrophilicity, porosity and inter-connected finger-like strcture of modified membranes confirmed by water contact angle and SEM. In addition, pure water flux of PVC/ZnO-CMC composite membrane was 107.36 L m −2 h −1 (PVC/ZnO-CMC (0.25 wt%)), which was higher than that of neat PVC membrane (83.11 L m −2 h −1 ). Importantly, the modified membranes exhibits lower static BSA adsorbtion because of the improved hydrophilicity, and a higher flux recovery rate (>90%) after three sequential filtration cycles. The antibacterial behavior of PVC/ZnO-CMC membrane was tested simply using Escherichia coli , and the results indicated that all composite membranes possess excellent antibacterial properties. Our work presents PVC/ZnO-CMC NPs composite membrane a promising future in wastewater treatment and antibacterial application.
研究领域:
材料科学
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环境工程
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生物医学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Central South University
·
2022
·Vol. 29
·期 6
·1778-1787
·
IF 2.392
Zhang Hao,He Qing-song,Tian Cheng-bo,Wu Yu-wei,Zhao Ze-fang,Yu Min
Inspired by the microstructure of gecko’s toe, two kinds of polyvinyl chloride (PVC) gels with different modulus were poured on a silicon mold with micropillars, and then a bio-inspired adhesive with variable modulus was manufactured in this study. The adhesions of variable modulus and fixed modulus bio-inspired adhesives were tested, respectively, on a smooth glass and a printed circuit board (PCB) with different surface structures. The results show that PVC gel bio-inspired adhesives with variable modulus have many advantages compared with the fixed modulus bio-inspired adhesives. The adhesion of variable modulus bio-inspired adhesives on the rough PCB surface increased by 2–5 times, and due to the use of variable modulus of PVC gel, the surface micropillars can maintain high aspect ratio and flexible tips at the same time. Moreover, the use of PVC gel makes it easier to demold during the bio-inspired adhesives preparation. An adhesion-desorption device was made according to the movement of the gecko toes, and the PCB was successfully grasped.
研究领域:
材料科学
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仿生学
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生物工程
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Zhuang Liu,Dachao Ma,Liwu Liang,Xuan Hu,Mengxue Ling,Zhou Zhou,Lizhong Fu,Zheng Liu,Qingge Feng
Hydrothermal treatment (HTT) of polyvinyl chloride (PVC) can efficiently remove chlorine (Cl) to produce low Cl hydrochar for solid fuel. This work performed co-hydrothermal treatment of PVC recycled plastics (PVC R ) with biomass, then tried to reveal the combustion behavior and Cl migration behavior during combustion of PVC-derived hydrochar . It is shown that the hydrothermal temperature was the dominant factor affecting the degradation and dechlorination of PVC R . Treated at 220 ℃ for 60 min, the dechlorination efficiency of PVC R was 4.88 wt% and it was significantly increased to 34.09 wt%, 28.60 wt% and 32.50 wt% when PVC R was co-treated with bagasse, bagasse + high impact polystyrene (HIPS) and bagasse + acrylonitrile butadiene styrene (ABS), respectively. The substitution of Cl by hydroxyl (-OH) and elimination were two main dechlorination pathways. Bagasse could provide abundant -OH so as to promote the dechlorination of PVC R . Interestingly, in the combustion of PVC R and hydrochars, the Cl was mainly released in the form of HCl at lower temperature combustion stage but C-Cl mostly emitted at higher temperature combustion stage . The emitted Cl species strongly depends on the Cl content in hydrochar and combustion temperature , but did not show relevance to the existence form of Cl in hydrochar. Hydrothermal dechlorination could sharply reduce HCl emission.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 32
·46542
·
IF 1.901
Yangze Huang,Erlei Yu,Yanke Li,Zhong Wei
A series of hyperbranched poly(ɛ-caprolactone) (HPCLs, denoted as D X ) with different molecular weights were synthesized by the copolymerization of GPCL (PCL initiated by glycidol) and succinic anhydride. The chemical structure of D X was characterized by 1 H-NMR gel permeation chromatography and inherent viscosity, and D X was used as the plasticizer for poly(vinyl chloride) (PVC) compared to traditional plasticizer di-(ethylhexyl) phthalate (DEHP). The thermal properties, morphology, mechanical properties, and migration stabilities of PVC films were explored with differential scanning calorimetry, thermogravimetric analysis, scanning electron microscope, tensile, and migration tests. PVC/D 1 exhibited the best plasticization efficiency up to 107%, with enhanced tensile strength (18.5 MPa) and ultimate elongation (416%) compared to PVC/DEHP (11.5 MPa and 375%, respectively). PVC/D 1 exhibited remarkably high plasticization efficiency as compared to PVC/DEHP at a plasticizer concentration of PVC below 40 wt %. Moreover, the migration test for PVC/D X films exhibited minimal plasticizers migration even at very harsh conditions. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46542.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2021
·
IF 0
Mansurjon Juraev,Xiao Ya Zhou,Xiao Tao Ma,Cheng Fang,Ye Qian Ge,Qiu Feng Ye,Feng Ye
The structure of basic lanthanum orotate (LaOr) were characterized by elemental analysis and infrared spectroscopy. The thermal stability of polyvinyl chloride (PVC) was further studied by Congo red method, oven discoloration method and thermogravimetric analysis. The results showed that LaOr could prolong the oven discoloration time of PVC, and the color was not completely blackened until 120 min. It has a good synergetic effect with dibenzoyl methane (DBM), and the best effect is achieved when LaOr/DBM ratio is 1.8/1.2. The thermal decomposition kinetics experiment showed that adding DBM can effectively improve the activation energy of PVC/LaOr. The stabilization mechanism of PVC was studied by absorbing HCl method and infrared spectroscopy. The results showed that LaOr could not only replace the unstable chlorine atoms on PVC, but also promote the long-term thermal stability of PVC by absorbing HCl.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
FIRE AND MATERIALS
·
2024
·Vol. 48
·期 6
·657-667
·
IF 2
Bin Zhang,Shaohua Zeng
The properties and structure of flexible PVC by incorporating zinc borate (ZB)-modified diantimony trioxide (Sb 2 O 3 ) were investigated. The results of flame retardancy and smoke suppression testing indicate that there was an obvious maximum Limited oxygen index (LOI) value of PVC/20 wt.% ZB–Sb 2 O 3 composites reached 37.5% and passed the UL 94 V-0 rating. An obvious synergistic effect between ZB and Sb 2 O 3 was observed by LOI, SDR, and TG. Moreover, remarkable decreases in the smoke density were observed when ZB–Sb 2 O 3 was incorporated into PVC. In addition, the tensile strength and elongation at break of PVC/ZB–Sb 2 O 3 composites was higher than PVC/Sb 2 O 3 composites, and this ameliorative effect was mainly arising from the ZB–Sb 2 O 3 nanoparticles, which reduced the degree of fatal defects on PVC. The addition of ZB and Sb 2 O 3 greatly increased the amount of residual char and apparently improved the mechanical properties of PVC composites. According to scanning electron microscopy photographs of residual char, after thermal decomposition, there were many fragments linked to the condensed phase and the compact char layer. Fourier transform infrared spectroscopy shows the residues char was composed of benzene ring, the flame retardants occurred and the condensed phase with significant interactions.
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
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 11
·4538-4546
·
IF 3.288
Mei Wang,Shouhai Li,Haiyang Ding,Jianling Xia,Mei Li
In the present work, tung-oil-derived imide epoxidized esters (GEABTMI) were prepared and used as poly(vinyl chloride) (PVC) co-stabilizers. Characterization results confirmed the successful preparation of the targeted material. The thermal stabilizing effects of CaSt2/ZnSt2/GEABTMI (St: stearic acid) were compared with those of CaSt2/ZnSt2/ABTMI {ABTMI: N-(3-amino-benzoic acid) tung-maleimides} and CaSt2/ZnSt2. The experimental results showed that of the materials tested, CaSt2/ZnSt2/GEABTMI could provide the best long-term thermal stability for PVC. According to the thermal stability results and characterization, the simultaneous introduction of imide and epoxy groups into the GEABTMI structures was responsible for the excellent performance of the stabilized PVC. Furthermore, a mechanism for the stabilization of the PVC/CaSt2/ZnSt2/GEABTMI system was proposed. According to this proposal, the imide groups trapped the labile chlorine atoms removed from the PVC chain and reacted with the unstable macromolecular radical of PVC, disrupting in this way the radical chain degradation of PVC; and the epoxy group acted as an HCl absorber at the subsequent stages of degradation, avoiding in this way the harmful effects caused by the presence of HCl. Apart from the better stabilization performance, CaSt2/ZnSt2/GEABTMI yielded a PVC plasticization performance similar to those resulting from the use of the other stabilizers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Chenhao Li,Yi Niu,Linlin Yi,Yaoqiang Li,Jia Fu,Fang Tang,Kaiyuan Li,Yanyan Zou
This paper explores the application of zeolitic imidazolate framework-8 (ZIF-8) in pyrolytic disposal of poly(vinyl chloride) (PVC), with the goal of assessing the in situ catalytic removal and capture effect of ZIF-8 on Cl, elucidating the migration pattern of Cl, revealing the mechanism of in situ Cl capture by ZIF-8. The results demonstrate that excellent catalytic and Cl trapping properties are exhibited by ZIF-8, and an additional 311.1 mg/g of organic Cl from PVC is facilitated to be removed at 250 ºC. The catalytic effect enhances Cl trapping at low temperatures. The solid-solid reaction between PVC and ZIF-8 during in situ pyrolysis significantly improves Cl capture compared to ex situ pyrolysis. During in situ pyrolysis, ZIF-8 shows excellent Cl capture between 250 and 350 ºC, where Cl is primarily captured in the solid phase as inorganic Cl. ZIF-8 achieves optimal Cl capture at 300 ºC, reaching a peak HCl removal rate of 89.5 %. At this temperature, the content of solid-phase inorganic Cl reaches a maximum of 442.0 mg/g, accounting for 78.7 wt% of the total Cl content. The key to Cl capture lies in the chemical adsorption sites of Zn²⁺ and organic ligands in the ZIF-8 structure, which can react with Cl in both solid-solid and gas-solid reactions. Additionally, crystals formed during pyrolysis create an adsorption barrier, ultimately enabling efficient Cl capture.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Qian Yang,Yanxin Xie,Baoku Zhu,Yan Zeng,Hangyue Zhou,Panpan Ai,Gairong Chen
One of the major focuses in the field of sewage is the development of low-pressure driven and high-efficiency filtration membrane, particularly for removing extremely low-concentration heavy metals cations. A new type of polyvinyl chloride (PVC) blended ultrafiltration (UF) membrane was fabricated to reject heavy metal cations (e.g., Cd 2+ , Co 2+ , Ni 2+ , Cu 2+ , and Zn 2 + ) from simulated waters using micellar enhanced ultrafiltration (MEUF) in this research. The positively charged PVC UF membrane was fabricated by blending PVC and amphiphilic poly (methyl methacrylate- co- dimethylaminoethyl methacrylate) (PMD) which was in-situ quaternized by methyl iodide (CH 3 I), then the PVC/PMD blended membrane was fabricated via nonsolvent induced phase separation (NIPS) process. The membranes' pore morphology, surface chemical compositions, surface charge, water contact angle, mechanical strength and water flux were investigated in detail. The influence of pH, transmembrane pressure, sodium dodecylbenzene sulfonate (SDBS) concentration on the filtration of pure SDBS solution was studied. SDBS was subsequently used as surfactant to remove heavy metal ions by micellar enhanced ultrafiltration (MEUF). For a molar ratio of 40:1 (SDBS: metal cation), the rejection of feed solution containing 10 ppm metal cations (e.g., Cd 2+ , Co 2+ , Ni 2+ , Cu 2+ , and Zn 2+ ) surpassed 96% with MEUF method. The results showed that the prepared membrane had low-pressure driven and high-efficiency performance, which provided a potential solution for the high-efficiency removal of trace heavy metals cations.
研究领域:
环境工程
·
膜科学
·
水处理技术
·
材料科学
✓ 已验证
DOI
高影响因子
Polymer-Plastics Technology and Materials
·
2021
·
IF 2.371
Yan Zhang,Zaifeng Shi,Tianyi Sun,Dashuai Zhang,Xiaopeng Zhang,Xiaoxue Lin,Chen Li,Lili Wang,Junjun Song,Qiang Lin
A novel photodegradable Methylene Blue (MB)/TiO2/PVC film was prepared. The physical and mechanical properties, hydrophilicity, and the thermal stability of the film before irradiation were characterized. The photodegradability test was performed by using gel permeation chromatography (GPC), infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), and scanning electron microscopy (SEM). Compared with TiO2/PVC, MB/PVC, and PVC, the MB/TiO2/PVC film showed the higher photodegradability. The weight loss rates of TiO2/PVC, MB/PVC, and MB/TiO2/PVC films after irradiation for 30 h were 8.94%, 15.84%, and 27.55%, respectively, while that of PVC was only 2.12%. The decline rates of Mw and Mn of MB/TiO2/PVC (MB 2 wt%, TiO2 1 wt%) were 35.68% and 65.38%, respectively. Due to the excellent degradability and usability of the MB/TiO2/PVC film, the photocatalytic technology is a feasible and effective way to solve “white pollution”.
研究领域:
材料科学
·
环境科学
✓ 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）