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关于PVC树脂中分层双氧化物热稳定过程的研究

Zhi Rao¹, Kaitao Li², Pingli Liu¹

¹Department of Applied Engineering, Gandong College, Fuzhou 344000, China.

Molecules (Basel, Switzerland)

|December 9, 2023

概括

层状双氧化物 (LDH) 作为有效的热稳定剂对聚乙烯 (PVC). 具有弱层间离子相互作用的LDH增强了PVC早期的稳定性,而高酸盐吸收提供了长期稳定性.

科学领域:

材料科学材料科学材料科学
聚合物化学聚合物化学

背景情况:

聚乙烯 (PVC) 的热稳定性较差,因此在加工过程中需要使用热稳定剂.
层状双氧化物 (LDH) 被认为是高效和环保的PVC热稳定剂.

研究的目的:

为了研究MgAl-LDHs在PVC树脂中具有不同介层离子 (CO3^2-, Cl-, NO3-) 的热稳定机制.
了解在PVC的热稳定过程中LDHs的结构演变.

主要方法:

物理混合的PVC和MgAl-LDHs粉末.
在180°C的温度下进行热老化.
使用X射线衍射 (XRD),扫描电子显微镜 (SEM) 和富里埃变换红外光谱 (FT-IR) 的结构分析.
热重力测量差异热分析 (TG-DTA).
PVC复合材料的热老化试验.

主要成果:

在PVC中LDH的热稳定过程涉及三个阶段:与HCl反应,离子交换和与HCl缓慢反应.
MgAl-Cl-LDHs主要仅与HCl进行初始反应.
LDH与中间层离子的相互作用强度按照下列顺序进行:NO3- < CO3^2- < Cl-.
具有较弱层间离子相互作用的LDH显著改善了早期的PVC稳定性.
具有高HCl吸收能力的LDH提供了优越的长期PVC稳定性.

结论:

低度氧化物通过涉及HCl清理和结构转换的多阶段过程有效地稳定PVC.
层间离子和LDH层之间的相互作用强度决定了初始稳定效率.
LDHs的高HCl吸收能力对于PVC的长期热稳定性至关重要.
设计具有定制性质的LDH可以导致具有增强热稳定的新型PVC树脂.

关键词:

的 LDHs 的 LDHs.在PVC中,PVC是PVC.热稳定器是一种热稳定器.热稳定过程的热稳定过程.

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