کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5205649 | 1502938 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrolytic degradation of bio-based polyesters: Effect of pH and time
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A hydrolytic degradation study of two bio-based polyesters, poly(trimethylene malonate) (PTM) and poly(trimethylene itaconate) (PTI) with bimodal molecular weight distribution, was performed in aqueous solutions adjusted to pH values from â¼5.5 to 11. Final weight loss varied from 20 to 37Â wt% for PTM and from 7 to 21Â wt% for PTI as a function of degradation time and initial solution pH. Fourier transform infrared (FTIR) spectroscopy was used to monitor ester bond concentration of these bioplastics, and the molecular weights and polydispersity index were obtained by gel-permeation chromatography (GPC). Solutions with lower initial pH values resulted in lower molecular weights for both PTM and PTI after one week of degradation. Degradation especially affected the amorphous region, leading to an increase in crystallinity of PTI samples.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 52, July 2016, Pages 192-199
Journal: Polymer Testing - Volume 52, July 2016, Pages 192-199
نویسندگان
Mathew D. Rowe, Ersan Eyiler, Keisha B. Walters,