JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 4
·1-13
·
IF 2.8
Gao Bingying,Sun Xuzhang,Wang Can,Yao Chao,Mao Linqiang
Pyrolysis or dissolution of waste PET plastics (WPP) by specific solvents, which is inevitable in the resource’s secondary utilization, will lead to chemical bond fracture thus resulting in loss of mechanical strength. This greatly restricts the secondary utilization of WPP. We proposed a simple and economical new chemical method to transform WPP into a high–value monolithic material, which not only solves the problem of environmental pollution, but also provides a new idea for the disposal of WPP. The new high temperature resistant chemical structure Al–O–P–O–Al was successfully generated through the reaction of high temperature resistant adhesive Al(H 2 PO 4 ) 3 (AHP) with the monomer or polymer from dissolved WPP. New chemical bonds such as –OH, C = O, C–Cl, P = O were also formed in the transformed monolithic material structure, and they were the principal reason for the increase in mechanical strength of monolithic material. The original hydrophilic group on the surface of the monolithic material was replaced by the hydrophobic group –CH 3 after the treatment by triethoxyoctylsilane (TS). Ultimately, the resulting monolithic material exhibited good comprehensive properties of high flame retardancy, flame retardancy (~ 1300 °C), mechanical strength (maximum compressive strength of 29.1 MPa), and hydrophobicity (water contact angle: 110°). This work has important implications for solving the serious problem of a sharp decline in mechanical strength and inflammability in the reuse of WPP.
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
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22550-22560
·
IF 3.925
Lili Wang,Lei Chen,Mengyao Tang,Shoujie Jiang,Dawei Gao
A novel AgI/Ag6Si2O7/PET Z-scheme heterojunction photocatalyst with strong redox capability was fabricated via a facile successive ionic layer adsorption and reaction (SILAR) method to degrade methyl orange (MO). Compared with Ag6Si2O7/PET and AgI/PET, the prepared AgI/Ag6Si2O7/PET heterojunction exhibits superior photocatalytic performance under visible light because of its strong interfacial coupling effects. The degradation rate constant of the optimal AgI/Ag6Si2O7/PET is up to 0.144 min−1, which is approximately 5.5 and 9.6 times greater than that of Ag6Si2O7/PET and AgI/PET, respectively. The radical capture experiments and ESR characterization demonstrate that h+ and ˙O2− are two major oxidative species responsible for the photocatalytic degradation of dyes. The PL, photocurrent and EIS analyses indicate that AgI/Ag6Si2O7/PET shows enhanced electron–hole pair separation efficiency. This phenomenon is related to three aspects, namely the high light-harvesting efficiency, greatly enhanced accessibility to the active site, and the formation of Z-scheme heterojunction structures that effectively improve the photoelectron–hole separation efficiency and the redox capacity of the photocatalyst. Our work, therefore, provides novel insights into the development of a heterojunction composite with boosted photocatalytic activity, excellent stability, and reusability for the degradation of organic pollutants.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Wenbin Qu,Lixin Song,Guixiang Peng,Xiaoli Shao,Yang Wang,Pingfan Du,Jie Xiong
Petroleum-derived PET plastics and fibers are widely used in packaging and textile applications due to their superior properties and have become a major source of plastic waste. In this study, Ni 2 P-Co x P/ZrO 2 /C NFs p-n heterojunction photocatalytic system with the UiO-66-NH 2 metal-organic backbone (MOFs)-derived ZrO 2 (U-ZrO 2 ) was constructed by a combined method of electrospinning, carbonization, hydrothermal, and phosphorization process. Carbon nanofibers are used as carriers to combine the different components effectively. The Ni 2 P-Co x P/U-ZrO 2 /C NFs show strong light absorption ability throughout the entire visible light region. The needle-shaped structure formed by Ni 2 P-Co x P can provide abundant active sites, increase the reflection of light on the fiber surface, and promote the utilization of light by the photocatalyst. With the incorporation of the MOF structure, the specific surface area of the fibers was greatly enhanced. The coupling of Co x P with Ni 2 P and U-ZrO 2 establishes a p-n heterojunction at the photocatalytic interface, which promotes the separation efficiency of photogenerated carriers and prolongs the charge lifetime while maintaining the strong redox capacity of the catalyst, enhancing the photocatalytic degradation activity. The MOF-derived ZrO 2 still maintains an octahedral shape, which favors the attachment of Ni 2 P and Co x P. As a result, the hydrogen production of the system reached 303.64 μ mo l H 2 g Sub − 1 after 24 h, and the weight loss rate of PET reached 18.77 ± 4.28%. Besides, the reusability of the catalyst was greatly improved by re-phosphorization of the used catalyst, which enables it to recover its catalytic degradation efficiency. This work provides new insights into the rational design of heterojunction photocatalysts with superior degradation performance.
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
BIOMACROMOLECULES
·
2025
·
IF 5.4
Yu Sun,Yushuang Shang,Xinyu Zhang,Zhaoyan Ge,Fengni Liu,Jian Shen,Jiang Yuan
Mimicked by the structure of dimethyl sulfoxide propionate (DMSP), a novel zwitterion monomer of N-methylacryloyl S-methyl l-cysteine methyl sulfonium salt (NMASMCMS) was synthesized and characterized for the first time through three steps using l-cysteine as a starting material. Poly(NMASMCMS) brushes were constructed on PET sheets via surface-initiated reversible addition–fragmentation chain-transfer (SI-RAFT) polymerization. The physical and chemical structures were characterized by water contact angle (WCA), attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The polymer brush grafted sheets (PET-B) had good hydrophilicity and high lubricity. Moreover, PET-B sheets exhibited excellent antifouling and hemocompatible properties with low protein adsorption, bacterial adhesion, platelet adhesion, and hemolysis.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Yueqing Wang,Hongxing Wang,Hongmei Chen,Hantao Liu
Converting polyethylene terephthalate (PET) wastes to its monomer and valuable chemicals via eco-friendly chemical method is still a challenge task. Previously, phase transfer catalysts used for alkaline hydrolysis were soluble in reaction media and hardly separated after reaction. Here, we reported several pH-responsive catalysts combined alkyl quaternary ammonium units with heteropolyacid anion for achieving stepwise product/catalyst separation and catalyst recycling. The properties of homogeneous/heterogeneous transfer behavior allow catalyst to be easily separated from reaction media by adjusting of pH value. Among them, [C 16 H 33 N(CH 3 ) 3 ] 3 PW 12 O 40 (abbreviated as [CTA] 3 PW) exhibits the highest activity and the most suitable pH responsive values. Such a pH triggered switchable catalytic system not only shows good performance for depolymerization of pure PET, but also some real PET wastes such as coloured trays and PE/PET complex films could be completely degraded into terephthalic acid. Additionally, the reaction kinetics and activation energy of PET alkaline hydrolysis also studied with and without pH-responsive [CTA] 3 PW.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Qiongzhen Liu,Cong Yi,Jiahui Chen,Ming Xia,Ying Lu,Yuedan Wang,Xue Liu,Mufang Li,Ke Liu,Dong Wang
Lightweight and flexible multifunctional conductive fabrics with excellent environmental stability are highly demanded for electromagnetic interference (EMI) shielding and e-textiles related applications. The relationship between the fabric structure and the EM properties of conductive fabrics has aroused extensive research interest, but it is still full of challenges. Herein, warp knitted polyethylene terephthalate (WK-PET) fabric and non-woven PET (NW-PET) fabric with irregular pore structure and similar thickness are selected as substrates. Flexible Ni/PPy/PET fabrics with high EMI shielding effectiveness have been facilely fabricated by in-situ polymerization of pyrrole (Py) and subsequent electroless plating of nickel. The conductivity, EMI shielding effectiveness and the normalized effectiveness of the Ni/PPy/NW-PET fabric is 96.32 S/cm, 77.87 dB, 1600.19 dB cm 2 /g, respectively, which are better than those of the Ni/PPy/WK-PET (91.71 S/cm, 62.6 dB, 1037.11 dB cm 2 /g). A simplified fabric structure model and fractal dimension of the fabrics have been proposed in this study to reveal the relationship between the fabric structure and the EMI shielding effectiveness. It implies that the fractal dimension of a conductive fabric is highly related to its absorption EMI shielding effectiveness. It also suggests a fabric with a higher fractal dimension as a base material can provide more connected conductive networks and better EMI shielding effects for the resulting conductive fabric. Moreover, the Ni/PPy/NW-PET fabric demonstrates outstanding heat-humid stability, high bending stability and washability, as well as great potential in wearable fabric antennas. In short, this work may provide a novel idea for the development of high-performance conductive fabrics.
研究领域:
材料科学
·
电子纺织品
✓ 已验证
DOI
高影响因子
RESOURCES CONSERVATION AND RECYCLING
·
2024
·
IF 11.2
Yunxing Zhao,Denian Li,Xuanyuan Ni,Pengcheng Cai,Guanghao Chen,Dongsheng Xia,Zixu Sun,Haoran Yuan
With numerous PET plastics being discarded, mankind is faced with serious environmental challenges. Innovative upcycling strategy to convert waste PET into functional materials is receiving attention. Meanwhile, water electrolysis is an environmentally friendly way for hydrogen production, but is limited by expensive catalysts. RuO 2 , as a potential alternative catalyst, is insufficient in stability and activity. Accordingly, we propose a novel OER catalyst (Ru x Mn 1.2 Co 0.8 O y ) converted from waste PET plastics via a bimetallic-MOF pathway, which partially retains the stacked nanorods structure and forms Mn,Co-doped RuO 2 with decreased particle size. The Ru x Mn 1.2 Co 0.8 O y delivers an overpotential of 214 mV at 10 mA cm −2 and operates stably over 500 h; moreover, the method is generalizable to diverse PET plastics. Theoretical calculations reveal the Ru sites adjacent to Mn- and Co-doped sites have low overpotential and favorable activity. This work provides a strategy for the high-value recycling of plastics resources and the development of OER electrocatalyst.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yehan Yang,Mengxia Xu,Zhu Luo,Ruhui He,Jikai Xie,Shenglong Yang,Hu Chen,Huaibin Li
To address the compatibility challenges between polypropylene (PP) and poly(ethylene terephthalate) (PET), a long-chain-branched polypropylene compatibilizer featuring ester groups (LCB-PP-E) was synthesized from PP and pentaerythritol triacrylate (PETA), facilitated by the initiator dicumyl peroxide. The structure of LCB-PP-E was characterized by using infrared spectroscopy, rheology, and melt flow index analysis, while potential reaction mechanisms were discussed. The morphology of the blend was examined by scanning electron microscopy and Raman spectroscopy. The effects of LCB-PP-E on the thermodynamic and crystallization behavior of PP/PET blends were studied by dynamic mechanical analysis, differential scanning calorimetry, and polarizing microscopy. LCB-PP-E sampled at the reaction peak point exhibited a longer branched PP chain compared to that of LCB-PP-E obtained at the balance torque, facilitating better entanglement with PP macromolecules. Furthermore, the ester groups on LCB-PP-E engaged in transesterification reactions with the ester groups on the PET chains. The combined effects of these interactions effectively reduced the interfacial tension between the two phases, resulting in a decreased size of the dispersed PET phase and a more uniform distribution. Additionally, the introduction of LCB-PP-E significantly narrowed the crystallization and glass transition temperature difference between the phases. The enhanced compatibility led to an increase in elongation at break, demonstrating a transition of the blend from a brittle material to a ductile material. This compatibilization system shows substantial potential for high-quality applications in PP/PET recycled plastics.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2015
·
IF 3.562
De-Ming Guo,Teng Fu,Chao Ruan,Xiu-Li Wang,Li Chen,Yu-Zhong Wang
In order to avoid the serious melt-dripping problems caused by conventional phosphorus flame retardants , a new arylene-ether containing monomer named 2,2′-(4,4′-(1,4-phenylenebis(oxy))bis(4,1-phenylene))bis(oxy) diethanol (PBPBD) was synthesized and introduced into the PET main-chain via condensation polymerization. With the incorporation of arylene-ether units, the thermal stability and the char residue from combustion of flame-retardant-element-free copolyesters containing PBPBD (BD x PETs) increased dramatically. However, the crystallinity and melting temperature of these copolymers were lower than the same quantities for PET. Thermal degradation kinetic was investigated using the Ozawa-Flynn-Wall method, which illustrated that the apparent activation energy for decomposition of the copolyesters was enhanced with increasing the conversion and the content of PBPBD. Py-GC/MS results showed that the PBBPD structural units undergo rearrangement reactions at high temperature, and ultimately form conjugated heteroaromatic structures, which lead to the formation of stable char residues with unique “stick-shaped” micro-morphology. Due to these rearrangement reactions, BD x PETs showed an expected flame retardant performance and a reduction in smoke generation during combustion. For example, the LOI value for BD 10 PET was 28.4, and the total smoke production (TSP) was 10.4 m 2 , much smaller than that for PET, 18.8 m 2 . Moreover, melt-dripping was restricted.
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
ACS Catalysis
·
2024
·
IF 11.3
Yi Zheng,Qingbin Li,Pan Liu,Yingbo Yuan,Longyang Dian,Qian Wang,Quanfeng Liang,Tianyuan Su,Qingsheng Qi
Poly(ethylene terephthalate) (PET) is the most abundant polyester plastic and is causing serious environmental pollution. Rapid biological depolymerization of PET waste at a large scale requires powerful engineered enzymes with excellent performance. Here, we designed a computational strategy to analyze the ligand affinity energy of enzymes to PET chains by molecular docking with the dynamic protein conformations, named affinity analysis based on dynamic docking (ADD). After three rounds of protein engineering assisted by ADD, we drastically enhanced the PET-depolymerizing activity of leaf-branch-compost cutinase (LCC). The best variant LCC-A2 depolymerized >90% of the pretreated, postconsumer PET waste into corresponding monomers within 3.3 h at 78 °C, and over 99% of the products was terminal depolymerization products (terephthalic acid and ethylene glycol), representing the fastest PET depolymerization rate reported to date in the bioreactor under optimal condition. Structural analysis revealed interesting features that improved the ligand affinity and catalytic performance. In conclusion, the proposed strategy and engineered variants represent a substantial advancement of the biological circular economy for PET.
研究领域:
环境科学
·
生物技术
·
材料科学
·
蛋白质工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 330
·期 3
·997-1005
·
IF 1.371
Yang Yuchuan,Wang Jing,Liu Wei,Deng Hao,Zhao Peng,Liao Wei,Wang Guanquan,Wei Hongyuan,Zhuo Liangang,Yang Xia
Death receptor 5 (DR5) is overexpressed in many tumors. Combination of the anti-DR5 antibody with radionuclides such as lutetium-177 ( 177 Lu) could enhance apoptosis and decrease the possibility of drug-induced resistance. In this study, a humanized anti-DR5 monoclonal antibody CTB006 was labeled with zirconium-89 ( 89 Zr) and 177 Lu to improve its efficiency for diagnosis and radiotherapy, respectively. The radiolabeled antibodies showed high tumor uptake in colon205 xenografts according to the results of micro-PET imaging and biodistribution. The 177 Lu-DOTA-CTB006 could inhibit tumor growth significantly.
研究领域:
肿瘤学
·
核医学
·
分子影像学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Bo Xu,Meng Jia,Dong Wang,Siheng Zhao,Shouao Zhu,Lijun Qian
Four polyphosphate/polyphosphonate flame retardants (PAP, POP, PAP-UB and POP-UB) have been designed and synthesized to study the effects of phosphorus valence states and the presence of unsaturated carbon-carbon double bonds on self-cross-linking impacting flame-retardant modes of action. It was found that phosphorus valence states affect the proportion of flame-retardant activity between the gas phase and condensed phase. A phosphonate containing +3-valence phosphorus is primarily effective as a gas-phase flame-retardant, while the one containing +5-valence phosphorus mainly exerted an impact in the condensed phase. The introduction of an unsaturated bond enhances the carbon-forming effect promoted by polyphosphates/polyphosphonates in a degrading polymer matrix and increases the melt viscosity for blends at high temperature. The phosphorus-containing fragments which might have been released into the gas phase are locked in the condensed phase due to C C bonds cross-linking, thus forming more high-quality phosphorus-rich char layers. This effect balances the distribution of gas-phase and condense-phase flame-retardant effects and is especially obvious in PET/polyphosphonate blends containing +3-valence phosphorus, which originally plays mainly the role of a gas-phase flame retardant . PET blends containing unsaturated carbon-carbon double bonds display better carbon formation, flame-retardant activity and anti-dripping behavior than these do without this feature.
研究领域:
材料科学
·
化学
✓ 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）