کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7825291 | 1502925 | 2018 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and structural studies of an epoxidized natural rubber/titania (ENR-50/TiO2) hybrid under mild acid conditions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The ring-opening reaction of epoxide units in an epoxidized natural rubber/titania (ENR-50/TiO2) hybrid in the presence of acetic acid was studied using NMR techniques as well as FTIR spectroscopy. The thermal characteristics of the hybrid were evaluated using TG/DTG and DSC analyses. 1H NMR results suggest that 86.51% of the epoxide rings had opened in the hybrid, and the 13C NMR results revealed new peaks from the hybrid at δ 22.3, 34.8 and 72.2 ppm. 2D NMR (HMQC, HMBC and COSY) techniques further confirmed these assignments. FTIR spectra showed a characteristic Ti-O-C peak at 1028 cmâ1. The TG/DTG results showed four decomposition steps at 30-159, 229-325, 325-466 and 664-825 °C due to the presence of Ti moieties along with the mixture of polymer chains i.e., the ring-opened and intact epoxides of ENR-50, which also led to an increase in the Tg value of the hybrid (27.8 °C) compared with purified ENR-50 (-17.7 °C).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 65, February 2018, Pages 10-20
Journal: Polymer Testing - Volume 65, February 2018, Pages 10-20
نویسندگان
Omar S. Dahham, Rosniza Hamzah, Mohamad Abu Bakar, Nik Noriman Zulkepli, Sam Sung Ting, Mohd Firdaus Omar, Tijjani Adam, Khairunnisa Muhamad, Saad S. Dahham,