The β-form crystallization-modified polypropylene(PP)was prepared through melt blending with homopoly-merization-type PP-700+as a matrix resin and 2,6-benzenedicarboxamide(TMB-5)as a β-form nucleating agent.The effects of TMB-5 on the application performance and crystallization behavior of the modified PP were analyzed by using polarizing microscope,differential scanning calorimeter,universal testing machine,digital impact testing machine,and heat deflection temperature tester.The results indicated that the α-form crystal of PP-700+were gradually transformed to the β-form ones through induction by the TMB-5 nucleating agent.With an increase in the addition amount of TMB-5,the content of the β-form crystals,crystallization temperature and crystallization rate of the modified PP gradually in-creased.When 0.2 wt.％TMB-5 was incorporated into the PP-700+matrix,the content of the β-form crystals in the modified PP increased to 84.9％.As a result,its tensile strength,flexural modulus,and flexural strength were in-creased by 4.5％,14.6％,and 13％,respectively.However,there was no change in the impact strength.The modi-fied PP obtained an increase in the impact strength by 9.8％for the cantilever beam mode and by 5.9％for the Charpy beam mode,and its heat deflection temperature was increased by 42.13 ℃.These results ensure PP-700+obtain a wid-er application range.The modified PP developed in this work is especially suitable for the products that need to be used or sterilized at high temperature,such as plastic hot drink cups,microwave cookers,baby bottles,and disposable lunch boxes.
关键词
聚丙烯/β成核剂/力学性能/结晶行为/热变形温度
Key words
polypropylene/nucleating agent/mechanical property/crystallization behavior/heat deflection temperature
维普
万方数据