Fabrication and Properties of Modified Poly(butylene terephthalate) with Two‐Step Chain Extension,Macromolecular Materials and Engineering

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Fabrication and Properties of Modified Poly(butylene terephthalate) with Two‐Step Chain Extension
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2021-01-15 , DOI: 10.1002/mame.202000638
Xun Li ₁ , Min Xia ₂ , Di Qiu ₁ , Ren Long ₁ , Zihan Huang ₁ , Jie Li ₁ , Shijun Long _{1,

3} , Xuefeng Li _{1,

3}

Affiliation

High‐viscosity, low‐crosslinked poly(butylene terephthalate) (PBT) from organic chain extenders and inorganic particles are prepared. PBT modification adopted from multifunctional, commercially available chain extension containing nine epoxy groups (ADR9) occurs in the first‐step chain extension; hydroxyl addition modified dioxazoline (BOZ) serves as the second step. Anion stratiform inorganic hydrotalcite (HT) is used to adjust the crystallization behavior and damp‐heat aging properties of PBT. The reaction between the chain extender and PBT end‐groups such as carboxyl (–COOH) and hydroxyl (–OH) enhances the interfacial bonding between the PBT matrix and dispersed HT phases. With a fraction of chain extenders in the PBT matrix, the chain‐extended PBT exhibits higher mechanical properties, intrinsic viscosity, average molecular weight, and melt viscosity than those of unmodified PBT. Damp‐heat aging resistance measurements show correlation with initial carboxyl content in the resin. Reducing the concentration of carboxyl end‐groups in the resin is shown to increase hydrolytic stability. The modified PBT resin can be used in optical fiber communication cable industry for its high level of damp‐heat aging resistance as well as good mechanic properties.

中文翻译：

两步扩链改性聚对苯二甲酸丁二醇酯的制备与性能

由有机扩链剂和无机颗粒制备了高粘度，低交联的聚对苯二甲酸丁二醇酯（PBT）。第一步，在第一步扩链过程中，采用含有9个环氧基（ADR9）的多功能市售扩链剂进行PBT改性；羟基加成改性的二恶唑啉（BOZ）作为第二步。阴离子层状无机水滑石（HT）用于调节PBT的结晶行为和湿热老化性能。扩链剂与PBT端基（例如羧基（–COOH）和羟基（–OH））之间的反应增强了PBT基体与分散的HT相之间的界面键。在PBT基质中只有一部分扩链剂，扩链的PBT表现出更高的机械性能，特性粘度，平均分子量，和熔体粘度比未改性的PBT高。耐湿热老化性的测量结果表明与树脂中的初始羧基含量相关。降低树脂中羧基端基的浓度可提高水解稳定性。改性的PBT树脂具有很高的耐湿热老化性能和良好的机械性能，可用于光纤通信电缆行业。

更新日期：2021-03-18

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