ACS Omega
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2022
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IF 4.132
Tianxiang Deng,Shouhai Li,Puyou Jia,Na Yao,Haiyang Ding,Lina Xu,Yan Zhang,Xiaohua Yang,Mei Li
The phthalate-free self-plasticization of poly(vinyl chloride) (PVC) conforms to the concept of green chemistry. In this work, phthalate-free, biocontaining, self-plasticized PVC with nonmigration (4-an-TG-X-PVC; X = R, P, or O) was prepared by covalent attachment of ricinoleic acid, palmitic acid, and oleic acid, respectively, to the PVC matrix with 4-aminothiophenol and triglycidyl isocyanurate (TGIC) as intermediate bridges. 4-Aminothiophenol and TGIC acted as the nucleophilic reagent and the thermally stable substance, respectively. The 4-an-TG-X-PVC was observed by diverse characterization methods. Specifically, Fourier transform infrared spectra, 1H nuclear magnetic resonance, gel permeation chromatography, and migration stability tests proved the successful synthesis of 4-an-TG-X-PVC. Compared to the neat PVC, the mechanical property of 4-an-TG-X-PVC is better. The glass transition temperature (Tg) of PVC is 81.24 °C, while that of 4-an-TG-X-PVC decreased to 41.88, 31.49, and 46.91 °C. The 4-an-TG-X-PVC showed higher elongation at break and lower tensile strength than neat PVC. Simultaneously, the thermal property of 4-an-TG-X-PVC got a boost. Thermogravimetry–infrared and thermogravimetry–mass spectrometry showed that 4-an-TG-X-PVC released less HCl than neat PVC in a thermal environment. Discoloration experiments demonstrated that 4-an-TG-P-PVC had better heat stabilization and better color than 4-an-TG-O-PVC and 4-an-TG-R-PVC. This work provides a viable solution to the dependence on phthalates, reduced human health and ecological risks, and endowed PVC with improved thermal stability and nonmigration performance.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESIGNED MONOMERS AND POLYMERS
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2023
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IF 1.6
Ye Jia,Lijun Fan,Changtong Song,Dong Chen,Xianhong Zhang,Yuhong Ma,Wantai Yang
In this work, we reported a novel emulsion copolymerization of vinyl chloride monomer (VCM) with amphipathic monomer poly (ethylene glycol) methyl ether methacrylate (PEGMA) by using sodium dodecyl sulfate (SDS) as emulsifier and K2S2O8/NaHSO3 as redox initiator. Owing to the multifunctionality of PEGMA that can serve as co-monomer and ‘emulsifier’, the emulsion copolymerization is achieved successfully and the interesting results demonstrate quite different features such as:(1) the stable P[(VC)-co-(PEGMA)] latex is obtained only when the mass ratio of PEGMA > 10% (to total monomer mass), (2) a small amount of ionic emulsifier SDS is required to achieve a stable latex, and (3) the mechanism of the micellar formation is different from the typical emulsion polymerization. Unexpectedly, the obtained copolymer formed high content of gel fraction which is mainly caused by the chain transfer reaction of the PVC growth chain radical to the hydrogen atom of the methylene from alkoxy (-OCH2CH2-) of the PEGMA oligomer chain. However, it could be inhibited effectively by the addition of chain transfer agent 2-mercaptoethanol (2-MCE). Subsequently, the properties of as-obtained P[(VC)-co-(PEGMA)] copolymer are evaluated carefully and it exhibited unique features such as self-plasticization, lower Tg (decreased from 83.1 to 59.6 °C), higher heat resistance (increased from 270 to 290 °C), hydrophilic, and high transparent in comparison to pure PVC. These outstanding features of the P[(VC)-co-(PEGMA)] copolymer offered a potential route for the functional modifications of PVC and broadened its further use.
研究领域:
材料科学
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高分子化学
✓ 已验证
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2023
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IF 6.6
Yuying Liu,Baolong Xue,Shuheng Liang,Jiadeng Zhu,Yuanyuan Yu,Yulin Zhou,Mengjin Jiang,Junhua Zhang
Since the invention of movable type in ancient times, relief printing, often called flexographic printing, has been performed to mass-produce artifacts ranging from decorative graphics to printed media. Polyvinyl alcohol (PVA) substrates are soluble in water with low toxicity but have the disadvantages of poor elasticity and brittleness . Thus, this study aims to improve the resilience of water-developable photopolymer resin plates by modifying PVA with allyl polyoxyethylene ether (APEG) in solution polymerization . In order to better control polymerization, the reactivity ratios of both were investigated (r VAC = 0.32 and r APEG = 0.12). Impressively, the lowest glass transition temperature (T g ) of the modified PVA ( m -PVA) can reach −49.98 °C, which is significantly lower than that of PVA0599 (degree of polymerization = 500, degree of hydrolysis = 99 mol%) (T g = 52.02 °C). Moreover, this resultant m -PVA exhibits superior elongation at break (443.23 ± 37.65 %) than PVA0599 (9.98 ± 3.95 %). It is found that photopolymer plates of m -PVA have maintained a 98 % elasticity recovery rate even after water washing. Due to the better elasticity of m -PVA, the clarity of the photopolymer plate is higher than that of traditional PVA. This water-soluble self-plasticized m -PVA is expected to be applied to the fine flexographic printing industry, such as electronic devices, components, and sensors.
研究领域:
材料科学
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印刷技术
✓ 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）