The three-phase structure of isotactic poly(1-butene)
The three-phase structure of isotactic poly(1-butene)
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DOI：
10.1016/j.polymer.2008.01.026
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发表时间：
2008-03-03
期刊：
影响因子：
4.6
通讯作者：
Righetti, Maria Cristina
中科院分区：
文献类型：
--
作者：
Di Lorenzo, Maria Laura;Righetti, Maria Cristina
用常规量热法和调温量热法对全同立构聚丁烯的三相结构进行了详细的分析。的结晶，移动的非晶，和刚性的非晶馏分的发展进行了分析，作为一个功能的热历史，等温和非等温结晶。结果发现，在选定的实验条件下，PB-1中刚性非晶相的含量（w（RA））范围为w（RA）= 0.14至0.23，当聚合物在低温或高冷却速率下从熔体中结晶时，形成更高的值。总的和频率依赖性的反向热容量曲线的比较表明，全同立构聚（I-丁烯）的刚性无定形相的结晶过程完成后玻璃化，它的充分动员发生在约50 ℃。完全失透的确切温度受材料热历史的影响很小。试图将PB-1的机械性能与三相结构联系起来，并提出了杨氏模量与分析温度下的固体分数的相关性，由结晶相和刚性非晶相组成。(c)2008爱思唯尔有限公司保留所有权利。
A detailed analysis of the three-phase structure of isotactic poly(butene) was conducted by conventional and temperature-modulated calorimetry. The development of the crystalline, mobile amorphous, and rigid amorphous fractions was analyzed as a function of thermal history, upon isothermal and non-isothermal crystallization. It was found that, under the chosen experimental conditions, the amount of rigid amorphous phase (w(RA)) in PB-1 ranges from w(RA) = 0.14 to 0.23, with higher values formed when the polymer is crystallized at low temperatures or at high cooling rates from the melt. Comparison of total and frequency-dependent reversing heat capacity curves suggested that the rigid amorphous phase of isotactic poly(I-butene) vitrifies after completion of the crystallization process and that its full mobilization takes place at around 50 degrees C. The exact temperature of complete devitrification is slightly affected by the thermal history of the material. An effort to link the mechanical properties of PB-1 to the three-phase structure was attempted, and a correlation of Young's modulus with the solid fraction at the temperature of analysis, composed of crystalline and rigid amorphous phases, was proposed. (c) 2008 Elsevier Ltd. All rights reserved.