کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7824375 1502920 2018 34 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Castor oil-based high performance and reprocessable poly(urethane urea) network
ترجمه فارسی عنوان
شبکه ی کارآمد و قابل بازیافت پلاستیک (اورهن اوره) بر اساس روغن ریخته گری
کلمات کلیدی
پلی (اوره اوره)، روغن کرچک، ایسوسورید، آرامش استرس، واکنش تبادلی دی سولفید، پردازش پذیری،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی
A bio-based poly (urethane urea) (CIPUU) network comprised of castor oil (CO), isosorbide (IS) and 4-aminophenyl disulfide (APD) was prepared and compared to the corresponding polyurethane (CIPU) consisting of CO and IS. Permanently cross-linked CIPU could not be reprocessed, while CIPUU could be reprocessed, as the network topology could rearrange through an associative disulfide exchange reaction. CIPUU had a higher Young's modulus than CIPU due to the higher rigidity of APD with benzene rings and the formed hydrogen bonding of the urea unit. Stress relaxation measurement indicated that the network topology of CIPUU was stable at temperatures lower than 100 °C due to the inactive disulfide exchange reaction at low temperatures. The exchange reaction became increasingly active with increasing temperature, as evidenced by the gradually reduced relaxation time. CIPUU showed excellent reprocessability, as indicated by the remaining gel fraction and fully recovered mechanical properties after thermal remoulding at 180 °C several times. In addition, CIPUU showed good thermal stability with an onset decomposition temperature (∼260 °C) much higher than the reprocessing temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 70, September 2018, Pages 174-179
نویسندگان
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