Effect of Molecular Orientation on the Cold Crystallization of Amorphous–Crystallizable Polymers: The Case of Poly(trimethylene terephthalate)
Effect of Molecular Orientation on the Cold Crystallization of Amorphous–Crystallizable Polymers: The Case of Poly(trimethylene terephthalate)
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DOI：
10.1021/ie402860t
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发表时间：
2013-12
影响因子：
4.2
通讯作者：
N. Vasanthan;Nagababu Manne;Anusha Krishnama
中科院分区：
文献类型：
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作者：
N. Vasanthan;Nagababu Manne;Anusha Krishnama
采用不同拉伸比和应变速率拉伸聚对苯二甲酸三亚甲基（PTT）薄膜，研究了分子取向对非晶态可结晶聚合物冷结晶的影响。采用差示扫描量热法（DSC）和偏振傅里叶变换红外光谱（FTIR）相结合的方法研究了结构演化和非等温结晶动力学。冷结晶温度（Tc）、冷结晶放热（ΔHc）和随后的熔融温度（Tm）与整体分子取向密切相关。首次证明了分子总取向与冷结晶温度和冷结晶放热成反比关系。当总取向超过0.43的临界值时，不发生非等温冷结晶。研究了不同分子总取向PTT的非等温冷结晶动力学。
The effect of molecular orientation on cold crystallization of amorphous crystallizable polymers was examined using poly(trimethylene terephthalate) (PTT) films drawn to different draw ratios and strain rates. A combination of differential scanning calorimetry (DSC) and polarized Fourier transform infrared (FTIR) spectroscopy was employed to examine structural evolution and nonisothermal crystallization kinetics. The cold crystallization temperature (Tc), cold crystallization exotherm (ΔHc), and subsequent melting temperature (Tm) were carefully correlated to the overall molecular orientation. For the first time, the overall molecular orientation was shown to have an inverse relationship to the cold crystallization temperature, as well as the cold crystallization exotherm. Nonisothermal cold crystallization has not occurred when the overall orientation exceeded the critical value of 0.43. The kinetics of nonisothermal cold crystallization of PTT with a different overall molecular orientation has been inve...