کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7889575 1509863 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of uracil on crystallization and rheological property of poly(R-3-hydroxybutyrate-co-4-hydroxybutyrate)
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Effects of uracil on crystallization and rheological property of poly(R-3-hydroxybutyrate-co-4-hydroxybutyrate)
چکیده انگلیسی
Uracil was investigated as a nucleating agent for bacterially synthesized copolymer of R-3-hydroxybutyrate and 4-hydroxybutyrate (P3HB4HB). The effects of uracil on the crystallization kinetics, melting behavior, spherulite morphology, crystalline structure and rheological behavior of P3HB4HB were investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM), wide angle X-ray diffraction (WAXD), Fourier transform infrared (FTIR) spectroscopy and rheometer. The crystallization half-times (t1/2) of P3HB4HB decreased significantly in the presence of uracil. With addition of 1 wt% uracil, the t1/2 value of P3HB4HB melt crystallizing at 95 °C decreased to 2.37 min, about 3.5% of the neat polymer. In-situ FTIR spectra revealed the clear interactions between uracil and P3HB4HB in composites, inducing some precursory structures. Furthermore, the storage and loss modulus of nucleated P3HB4HB increased exponentially compared with neat P3HB4HB. It was proposed that uracil is an environment friendly nucleating agent and rheological modifier for the P3HB4HB.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Composites Part A: Applied Science and Manufacturing - Volume 109, June 2018, Pages 141-150
نویسندگان
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