کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5206088 1502947 2015 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spectroscopic analysis of post drawing relaxation in poly(lactic acid) with oriented mesophase
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Spectroscopic analysis of post drawing relaxation in poly(lactic acid) with oriented mesophase
چکیده انگلیسی
Uniaxial deformation of amorphous poly(lactic acid) (PLA) film was performed at 60 °C (around the glass transition temperature). The deformed samples revealed a strain-induced mesophase, and its fraction and thermal stability increased with draw strain. Further annealing was performed in situ at constant length, at the drawing temperature for the films drawn to strains of 100% and 230%. Interestingly, the orientation of amorphous phase relaxed more rapidly for the 100% sample compared with the 230% one. This could be ascribed to the constraint effect of mesophase on the amorphous chains. In addition, the chains of mesophase relaxed slightly for the 100% sample while it retained high orientation for the 230% sample. Meanwhile, the mesophase fraction decreased, and the trend was more significant for the sample drawn to 100%. These effects can be ascribed to the melting of mesophase and the different thermal stabilities of the mesophases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 43, May 2015, Pages 103-107
نویسندگان
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