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Effects of divinylbenzene‐maleic anhydride copolymer hollow microspheres on crystallization behaviors, mechanical properties and heat resistance of poly(l‐lactide acid)
Polymers for Advanced Technologies ( IF 3.4 ) Pub Date : 2019-12-22 , DOI: 10.1002/pat.4817
Hu Qiao 1, 2 , Jia Guo 3 , Li Wang 1, 2 , Jun Sun 1 , Shengling Jiang 1 , Sheng Zhang 1, 3 , Wantai Yang 1 , Xiaoyu Gu 1, 3 , Hongfei Li 1, 3
Affiliation  

Divinylbenzene‐maleic anhydride copolymer hollow microspheres (DMs) were used as novel organic nucleating agents to promote crystallization of poly(l‐lactide acid) (PLLA). The effects of these DMs on crystal behaviors of the PLLA were investigated by differential scanning calorimeter (DSC), polarizing optical microscopy (POM), and wide angle X‐ray diffraction (WAXD). Both isothermal and non‐isothermal processes in DSC demonstrated that the DMs significantly altered the crystal behaviors of PLLA as both crystallization velocity and degree of crystallinity increased with increasing DM loadings from 0 to 3%. Our POM results also indicated that as nucleating agents, the DMs promoted nucleating densities and decreased spherulitic sizes. In addition, WAXD suggeted that the addition of DMs did not induce new types of crystals. Finally, our results showed that the ductility of the PLLA was enhanced by a small amount of DMs during the PLLA crystallization process since 0.5% DMs added to the PLLA resulted in 1.4‐fold increase in the elongation at break in comparision with the neat PLLA.

中文翻译:

二乙烯基苯-马来酸酐共聚物中空微球对聚(丙交酯酸)结晶行为,力学性能和耐热性的影响

二乙烯基苯-马来酸酐共聚物中空微球(DMs)被用作新型有机成核剂,以促进聚(l-丙交酯酸)(PLLA)的结晶。通过差示扫描量热仪(DSC),偏振光学显微镜(POM)和广角X射线衍射(WAXD)研究了这些DM对PLLA晶体行为的影响。DSC中的等温和非等温过程均表明,DM会显着改变PLLA的晶体行为,因为DM加载量从0%增至3%时,其结晶速度和结晶度都会增加。我们的POM结果还表明,作为成核剂,DM促进了成核密度并减小了球体尺寸。此外,WAXD建议添加DM不会诱导新类型的晶体。最后,
更新日期:2019-12-22
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