کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5184662 1381054 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Novel moisture-sensitive shape memory polyurethanes containing pyridine moieties
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Novel moisture-sensitive shape memory polyurethanes containing pyridine moieties
چکیده انگلیسی

In this communication, novel moisture-sensitive shape memory polyurethane (SMPU) was synthesized from 1,6-hexamethylene diisocyanate (HDI) and N,N-bis(2-hydroxylethyl) isonicotinamide (BINA) and 1,4-butanediol (BDO). Results show that the BINA based SMPUs have excellent moisture absorption properties which are not only influenced by the temperature, but also by the relative humidity (RH). As a result, high strain recovery with fast recovery speed is obtained after immersion in the moisture condition for a short time. FT-IR spectra provide a proof to the mechanism of moisture-sensitive SME which is based on the dissociation or disrupt of hydrogen bonding in the pyridine ring induced by moisture absorption. Thus, the strain recovery is achieved in the moisture-sensitive SMPUs by decreasing the glass transition temperature (Tg) below ambient temperature without external heating.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 50, Issue 19, 10 September 2009, Pages 4424-4428
نویسندگان
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