کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5209889 | 1503074 | 2015 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of molecular weight of polydimethylsiloxane precursors and crosslinking content on degree of ethanol swelling of crosslinked networks
ترجمه فارسی عنوان
تأثیر وزن مولکولی پیش ماده های پلییدیمیل سیلکسان و محتوای متقابل بر روی میزان اتانول تورم شبکه های متقابل
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
Using PDMS (polydimethylsiloxane) as a basic polymeric matrix to the preparation of ethanol-permselective pervaporation membranes is a vibrant field of research. In this paper, a detailed study of the effects of the molecular weight of PDMS precursors and the content of the TEOS (tetraethyl orthosilicate) crosslinker on the degree of swelling in ethanol and ethanol contact angle is reported. Five PDMS precursors with molecular weights of 26.6Â K, 35.5Â K, 50.2Â K, 71.7Â K, and 110.4Â K, and five crosslinking contents (1Â wt%, 2Â wt%, 5Â wt%, 10Â wt%, and 15Â wt%) were chosen to prepare twenty-five PDMS networks. Considering only the maximum tensile strength of the networks, the optimum molecular weight of the precursor was found to be 35.5Â K and the optimum crosslinker content was 5Â wt%. The average Young's modulus of the PDMS network prepared under these conditions reached 0.63Â MPa after using toluene to extract the network. Some uncrosslinked precursors always occur in the networks, and have some influence on the molecular weight of the precursors and the crosslinker content that is used. It was found that the content of the uncrosslinked precursors has direct effect on the contact angle of ethanol sessile drops at the surface of the extracted PDMS networks, and higher extraction corresponded to a smaller ethanol contact angle. A combined parameter (S), defined as the quotient of the extraction amount (AE) and the tensile elastic modulus (EY), gives a good linear relationship with the increase in weight of networks swelled in ethanol. This means that the degree of equilibrium swelling of the networks is simultaneously strongly influenced by the tensile modulus and the content of the uncrosslinked precursors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Reactive and Functional Polymers - Volume 86, January 2015, Pages 264-268
Journal: Reactive and Functional Polymers - Volume 86, January 2015, Pages 264-268
نویسندگان
Wanqiu Zhang, Xing Su, Baoli Shi, Lili Wang, Qingwen Wang, Shujun Li,