采用差热扫描量热仪(DSC)、动态热机械分析仪(DMA)、傅里叶红外光谱仪(FT-IR)和万能拉伸试验机研究了在紫外光照射过程中聚乳酸/己二酸-对苯二甲酸-丁二酯共聚物(PLA/PBAT)薄膜的结晶性能、动态热机械性能、不同官能团含量以及力学性能。实验结果表明,经紫外光照射后,PLA/PBAT 薄膜的结晶能力变强,结晶度增大；储能模量减小,玻璃化转变温度升高,链段运动多样性增加,链段松弛变得容易；CH—含量减少,同时C?O 和—OH 含量增大；力学性能降低,且取向对于力学性能的降低幅度有重要影响。最后作者还给出了PLA/PBAT薄膜在紫外光照射过程中的降解机理。
The crystallization property,dynamic thermo mechanical property,different functional group content and mechanical property of the polylactide/poly (butyleneadipate-co-terephthalate)(PLA/PBAT)film in the process of UV irradiation were investigated by differential thermal scanning calorimeter (DSC),dynamic ther-mal mechanical analyzer (DMA),Fourier transform infrared spectrometer (FT-IR)and universal tensile testing machine.The results showed that,during UV illmination,the crystallization ability of PLA/PBAT film en-hanced and its degree of crystallinity raised simultaneously;the storage modulus continuously reduced while its glass transition temperature gradually became high,at the same time,the chain segment movement was more diverse and its chain segment relaxation became easy;the content of CH— decreasesed meanwhile the content of C?O and —OH increased;its mechanical properties got worse,and orientation had a significant influence on the fall range.At last,the degradation mechanism of PLA/PBAT film during UV irradiation was listed as well.
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