کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7787663 | 1500627 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Moisture effects on dielectric relaxations of poly (É-caprolactone)/starch biodegradable blends: Local, interfacial and segmental
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Moisture effects on dielectric relaxations of poly (É-caprolactone)/starch biodegradable blends: Local, interfacial and segmental Moisture effects on dielectric relaxations of poly (É-caprolactone)/starch biodegradable blends: Local, interfacial and segmental](/preview/png/7787663.png)
چکیده انگلیسی
Poly(É-caprolactone)/starch biocomposites in a wide composition range were studied by thermally stimulated depolarization currents, TSDC, during the drying process following the effect on the dielectric relaxations of moisture loss and blend composition. PCL's cooperative chain mobility is unaffected by the presence of water which is mainly located in the starch inclusions as its segmental relaxation is fixed at 207 K. The heterogeneities found in the amorphous phase of neat starch are also observed here as a bimodal α relaxation which shifts to higher temperatures as it dries. The blend plasticization by water molecules also affects the blend secondary relaxations showing how the local motions are hindered by the loss of water which is lower in the blend than in pure starch. The interfacial peak which is intermediate between the α relaxations of the two components is affected by the inclusions change from liquid to glassy state as the blend dries.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 131, 20 October 2015, Pages 15-22
Journal: Carbohydrate Polymers - Volume 131, 20 October 2015, Pages 15-22
نویسندگان
Dinorah Newman, Alfredo Bello, Estrella Laredo,