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一种通过以三种不同的异氰酸酯作为中间桥将蓖麻油接枝到聚氯乙烯链上来制备内增塑聚氯乙烯的策略。

A strategy to prepare internally-plasticized poly(vinyl chloride) by grafting castor oil onto the PVC chain with three different isocyanates as intermediate bridges.

作者信息

Deng Tianxiang, Li Shouhai, Yang Xiaohua, Xu Lina, Ding Haiyang, Li Mei

机构信息

Institute of Chemical Industry of Forest Products, CAF; National Engineering Research Center for Low-Carbon Emission & High-Efficiency Processing and Utilization of Forest Biomass;Key Lab. of Biomass Energy and Material Nanjing Jiangsu 210042 PR China

出版信息

RSC Adv. 2022 Sep 30;12(40):26297-26306. doi: 10.1039/d2ra03787d. eCollection 2022 Sep 12.

DOI:10.1039/d2ra03787d
PMID:36320220
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9524355/
Abstract

In this work, three types of internally-plasticized poly(vinyl chloride) materials (PVC-H-C, PVC-TH-C, PVC-IP-C) were prepared by grafting castor oil onto the PVC chain with three different isocyanates as intermediate bridges, respectively. The three different isocyanates were hexamethylene diisocyanate (HDI), trimer of HDI (THDI), and isophorone diisocyanate (IPDI). This method does not need any castor oil pretreatment. The effects of different isocyanates on the plasticizing ability of the internally-plasticized PVC and the thermal stability of the whole material were discussed. The grafting of castor oil onto PVC with hexamethylene diisocyanate (HDI) as the intermediate bridge has the best plasticizing effect among the three types of internally-plasticized poly(vinyl chloride) materials, as the elongation at break reaches 294%, and the glass transition temperature is lower than that of pure PVC from 75 to 58 °C. It is worth mentioning that the thermal stability is optimized when HDI trimer (THDI) is used as the intermediate bridge, which may be related to the triazine ring contained in THDI. Moreover, this PVC material (PVC-TH-C) also has higher decomposition activation energy when the mass loss is 40% and releases less HCl and benzene gas during thermal degradation. The three types of internally-plasticized PVC all show excellent migration resistance, and almost do not migrate in the petroleum ether environment.

摘要

在本工作中，通过分别以三种不同的异氰酸酯作为中间桥将蓖麻油接枝到聚氯乙烯（PVC）链上，制备了三种内增塑聚氯乙烯材料（PVC-H-C、PVC-TH-C、PVC-IP-C）。这三种不同的异氰酸酯分别是六亚甲基二异氰酸酯（HDI）、HDI的三聚体（THDI）和异佛尔酮二异氰酸酯（IPDI）。该方法无需对蓖麻油进行任何预处理。讨论了不同异氰酸酯对内增塑PVC的增塑能力以及整个材料热稳定性的影响。在三种内增塑聚氯乙烯材料中，以六亚甲基二异氰酸酯（HDI）作为中间桥将蓖麻油接枝到PVC上具有最佳的增塑效果，其断裂伸长率达到294%，玻璃化转变温度比纯PVC低，从75℃降至58℃。值得一提的是，当使用HDI三聚体（THDI）作为中间桥时，热稳定性得到优化，这可能与THDI中含有的三嗪环有关。此外，这种PVC材料（PVC-TH-C）在质量损失40%时也具有较高的分解活化能，并且在热降解过程中释放较少的HCl和苯气体。这三种内增塑PVC均表现出优异的抗迁移性，在石油醚环境中几乎不发生迁移。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/244e/9524355/26b1c25511d9/d2ra03787d-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/244e/9524355/ac96f8288925/d2ra03787d-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/244e/9524355/6c2f89ea842c/d2ra03787d-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/244e/9524355/26b1c25511d9/d2ra03787d-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/244e/9524355/ac96f8288925/d2ra03787d-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/244e/9524355/3347bd7b099f/d2ra03787d-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/244e/9524355/b25b91611c92/d2ra03787d-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/244e/9524355/6c2f89ea842c/d2ra03787d-f8.jpg
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本文引用的文献

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Fracture, fatigue, and friction of polymers in which entanglements greatly outnumber cross-links.聚合物的断裂、疲劳和摩擦，其中缠结数大大超过交联点。
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Flexible PVC materials grafted with castor oil derivative containing synergistic flame retardant groups of nitrogen and phosphorus.接枝有含氮磷协同阻燃基团的蓖麻油衍生物的软质聚氯乙烯材料。
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