Chemical Industry and Engineering Progress ›› 2020, Vol. 39 ›› Issue (7): 2768-2774.DOI: 10.16085/j.issn.1000-6613.2019-1621

• Materials science and technology • Previous Articles     Next Articles

Increase the viscosity of PET by one-step reaction extrusion with KH560 and nano-SiO2 as chain extender

Xiaoxia HU(), Liang WANG, Jie FENG()   

  1. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
  • Online:2020-07-10 Published:2020-07-05
  • Contact: Jie FENG

利用KH560和纳米SiO2采用“一步法”反应挤出增黏PET

胡肖霞(), 王亮, 冯杰()   

  1. 浙江工业大学材料科学与工程学院,浙江 杭州 310014
  • 通讯作者: 冯杰
  • 作者简介:胡肖霞(1990—),女,硕士研究生,研究方向为聚酯扩链。E-mail:787860541@qq.com

Abstract:

KH560 (3-glycidyloxypropyltrimethoxysilane) and nano-SiO2 particles were filled into PET melt by extrusion process to increase the melt viscosity of the PET. When the KH560 and the SiO2 particles were both filled at 2.5%(mass ratio), the melt viscosity-increasing effect was the best. Moreover, even the PET was not dried, the PET melt viscosity can also be improved by such chain extender, implying that it can be used as a regent to prevent the hydrolytic degradation of PET. Transmission electron microscopy imaging showed that the dispersion of nano-SiO2 in PET was well. The reaction mechanism between KH560, SiO2 and PET was confirmed by FTIR. The grafting of PET molecules to SiO2 nanoparticles was analyzed by TGA, and the graft ratio was 72%. The crystallization behavior of the PET/ SiO2 composites was studied by DSC. When the KH560 and SiO2 nanoparticles were both filled at 2.5% (mass ratio), the crystallinity of PET/nano-SiO2 composite is the lowest and the comprehensive mechanical properties were the best.

Key words: polyethylene terephthalate, silicon dioxide, reaction extrusion, viscosity increasing, chain extender

摘要:

以KH560(3-缩水甘油基氧基丙基三甲氧基硅烷)和纳米SiO2颗粒复配作为扩链剂,采用“一步法”反应挤出增黏聚对苯二甲酸乙二醇酯(PET)。KH560和SiO2的添加量均为PET质量分数的2.5%时,增黏效果最好。并且在PET不干燥的情况下,KH560和SiO2复配也可增加PET的黏度,可用作PET的扩链剂和防水解剂。经透射电镜观察,发现SiO2在PET中的分散状况良好。用FTIR研究了KH560、SiO2、PET三者之间的反应机理。用TGA分析了SiO2的接枝率,发现接枝率高达72.0%。用DSC对PET/纳米SiO2复合材料的结晶行为进行了研究,并讨论了结晶行为对力学性能的影响。当KH560和SiO2的添加量均为PET质量分数的2.5%时,结晶度最低,综合力学性能最好。

关键词: 聚对苯二甲酸乙二醇酯, 二氧化硅, 反应挤出, 增黏, 扩链剂

CLC Number: 

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