聚对苯二甲酸1,4-环己烷二甲醇酯-对苯二甲酸异山梨醇酯合成及性能研究
Synthesis and properties of poly(1,4-cyclohexanedimethanol terephthalate-co-isosorbide terephthalate)
朱兴松 1周倩 1李爽 1王余伟1
作者信息
- 1. 中国石化仪征化纤有限责任公司研究院,江苏仪征 211900
- 折叠
摘要
为了提高聚对苯二甲酸乙二醇酯(PET)的玻璃化转变温度,改善制品的耐热性能,以对苯二甲酸(PTA)、异山梨醇(ISB)、1,4-环己烷二甲醇(CHDM)、乙二醇(EG)为原料,采用直接酯化、熔融缩聚法合成聚对苯二甲酸1,4-环己烷二甲醇酯-对苯二甲酸异山梨醇酯(PCIT)共聚酯,考察ISB/CHDM比例对酯化及缩聚反应速率和产品性能的影响.采用差示扫描量热仪(DSC)研究了共聚酯的热性能,采用万能材料试验机表征了共聚酯的力学性能.结果表明,随着ISB添加量增加、CHDM添加量减少,酯化表观活化能增加、酯化及缩聚反应速率减缓、共聚酯b值升高、玻璃化转变温度Tg 升高、热降解速率加快、力学性能下降,但共聚酯在ISB含量为22.8%时,仍保持缺口冲击强度高于130 J/m、断裂伸长率大于100%.
Abstract
This paper used terephthalic acid(PTA),isosorbide(ISB),1,4-cyclohexanedimethanol(CHDM),and ethylene glycol(EG)as raw materials,and proposed the synthesis method of ethylene glycol and its esterification as intermediate products in order to improve the glass transition temperature of PET res-in and the heat resistance of its products.Direct melt polycondensation was used to create poly(1,4-cyclohex-anedimethanol terephthalate-co-isosorbide terephthalate)(PCIT)copolyesters.We looked into how the feed ratio of ISB to CHDM affected the product properties and reaction rates of esterification and polycondensation.The me-chanical characteristics of copolyesters were characterized and their thermal characteristics and viscosity chan-ges during simulated processing were investigated using differential scanning calorimetry(DSC).The findings indi-cated that the esterification apparent activation energy increased,the esterification and polycondensation reaction rate slowed down,the copolyester's b value increased,the glass transition temperature Tg increased,the ther-mal degradation rate accelerated,and the mechanical properties decreased with an increase in ISB content and a decrease in CHDM content.Nevertheless,the mechanical properties of copolyester declined when its ISB content rose to 0.5%.Compared to PEIT copolyesters,the notch impact strength was significantly higher at o-ver 130 J/m and the fracture elongation was over 100%.
关键词
聚对苯二甲酸1,4-环己烷二甲醇酯-对苯二甲酸异山梨醇酯/动力学/多元共聚/热性能/力学性能Key words
poly(1,4-cyclohexanedimethanol terephthalate-co-isosorbide terephthalate)/dynamics/poly-copolymerization/thermal performance/mechanical property引用本文复制引用
出版年
2024
NETL
NSTL
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