CHDA改性PBT的制备及其结构与性能研究
Preparation and structural properties of CHDA modified PBT
李晶 1张建 1周丽华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
以精对苯二甲酸(PTA)、1,4-丁二醇(BDO)和 1,4-环己烷二甲酸(CHDA)为原料,通过直接酯化法制得CHDA改性聚对苯二甲酸丁二醇酯(PBT)共聚酯,研究了CHDA含量对改性PBT共聚酯的结构和性能的影响.结果表明:随着CHDA含量的增加,改性PBT共聚酯的缩聚时间延长,特性黏数提高;CHDA的加入对改性PBT共聚酯的熔点、熔融结晶峰温度、结晶度的影响较大,当CHDA质量分数为 20%,改性PBT共聚酯的熔点降至 190.68℃,熔融结晶峰温度降至 140.49℃,结晶度降至 17.42%;改性PBT共聚酯的热稳定性略低于常规PBT,当CHDA质量分数为20%,改性PBT共聚酯的热分解峰值温度降至 399.25℃;随着CHDA含量的增加,改性PBT共聚酯的拉伸强度、弯曲强度降低,断裂伸长率、冲击强度升高,当CHDA质量分数为5%～10%时,改性 PBT 共聚酯的综合性能较优,拉伸强度为 40.65～44.11 MPa,断裂伸长率为143.23%～218.85%,冲击强度为 5.12～5.88 kJ/m2,弯曲强度为45.15～51.31 kJ/m2.
Abstract
Using purified terephthalic acid(PTA),1,4-butanediol(BDO)and 1,4-cyclohexanedicarboxylic acid(CHDA)as raw materials,CHDA modified polybutylene terephthalate(PBT)copolyesters were obtained through direct esterification.The effect of CHDA content on the structure and properties of the modified PBT copolyesters was studied.The results showed that the condensation time of modified PBT copolyester was prolonged and the intrinsic viscosity increased with the increase of CHDA con-tent;the addition of CHDA had a significant impact on the melting point,melting crystallization peak temperature and crystallini-ty of modified PBT copolyester,and the melting point of modified PBT copolyester decreased to 190.68℃,the melting crystalli-zation peak temperature decreased to 140.49℃and the crystallinity decreased to 17.42%when the mass fraction of CHDA was 20%;the thermal stability of modified PBT copolyester was slightly lower than that of conventional PBT,and the thermal decom-position peak temperature of modified PBT copolyester dropped to 399.25℃when the mass fraction of CHDA was 20%;and the tensile strength and bending strength of modified PBT copolyester decreased,the elongation at break and impact strength in-creased with the increase of CHDA content,and the comprehensive performance of modified PBT copolyester was excellent,with a tensile strength of 40.65-44.11 MPa,elongation at break of 143.23%-218.85%,impact strength of 5.12-5.88 kJ/m2 and bending strength of 45.15-51.31 kJ/m2,when the mass fraction of CHDA was 5%-10%.
关键词
聚对苯二甲酸丁二醇酯/1,4-环己烷二甲酸/共聚改性/热性能/力学性能Key words
polybutylene terephthalate/1,4-cyclohexanedicarboxylic acid/copolymerization modification/thermal property/mechanical properties引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据