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Synthesis of poly(vinyl chloride)-co-poly(acrylic acid) by precipitation polymerization and its usage as CaCO3 modifier in rigid PVC composites
Journal of Macromolecular Science, Part A ( IF 2.1 ) Pub Date : 2021-03-25 , DOI: 10.1080/10601325.2021.1901592
Changtong Song 1 , Hongyi Shu 1 , Xianhong Zhang 1 , Dong Chen 1 , Yuhong Ma 1 , Wantai Yang 1, 2
Affiliation  

Abstract

Incorporating carboxyl group into the poly(vinyl chloride) (PVC) resin can endow PVC with reactivity in some applications. In this work, poly(vinyl chloride)-co-poly(acrylic acid) random copolymer (PVCA) with low average number molecular weight (Mn, ∼10 k) is synthesized by precipitation polymerization. By tuning acrylic acid dropping rate, the PVCA copolymer with much more uniform copolymer composition is obtained in comparison to all monomer-in process. Subsequently, the PVCA is utilized as a novel polymer modifier for the surface treatment of CaCO3 particles and its effect on the mechanical properties of obtained rigid PVC composites are evaluated systematically. As a result, the PVAC modified CaCO3 particles exhibit uniform dispersibility and excellent compatibility in PVC matrix. Additionally, the thermal stability is improved significantly owing to the calcium ions on the surface of CaCO3 particles, which scavenge the hydrogen chloride and retard the autocatalytic dehydrochlorination process. Impressively, it also has an enhancement both in tensile strength (ca. 46.4 MPa, and 119.8% elongation at break) and in impact strength (2.7 kJ m−2) in comparison to those modified by commercialized agents such as stearic acid and titanate ester. This work provides valuable insights for the preparation of vinyl chloride copolymers and opens a new application.



中文翻译:

沉淀聚合法合成聚(氯乙烯)-共聚(丙烯酸)及其在硬质 PVC 复合材料中作为 CaCO3 改性剂的用途

摘要

在聚氯乙烯 (PVC) 树脂中加入羧基可使 PVC 在某些应用中具有反应性。在这项工作中,聚(氯乙烯)-共聚(丙烯酸)无规共聚物(PVCA)具有低平均数分子量(M n,~10 k)通过沉淀聚合合成。通过调整丙烯酸滴速,与所有单体工艺相比,PVCA 共聚物具有更均匀的共聚物组成。随后,PVCA 作为一种新型聚合物改性剂用于 CaCO 3颗粒的表面处理,并系统地评估了其对所得硬质 PVC 复合材料机械性能的影响。因此,PVAC 改性 CaCO 3颗粒在PVC基体中表现出均匀的分散性和优异的相容性。此外,由于CaCO 3颗粒表面的钙离子清除氯化氢并阻碍自催化脱氯化氢过程,热稳定性显着提高。令人印象深刻的是,与使用硬脂酸和钛酸酯等商业化试剂改性的那些相比,它还在拉伸强度(约 46.4 MPa,断裂伸长率为 119.8%)和冲击强度(2.7 kJ m -2)方面都有所提高. 这项工作为氯乙烯共聚物的制备提供了宝贵的见解,并开辟了新的应用领域。

更新日期:2021-03-25
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