Polymorphic transformation of isotactic poly(1-butene) in form III upon heating: in situ synchrotron small- and wide-angle X-ray scattering studies.
Polymorphic transformation of isotactic poly(1-butene) in form III upon heating: in situ synchrotron small- and wide-angle X-ray scattering studies.
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DOI：
10.1021/jp101017n
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Zhiyong Jiang;Y. Sun;Yujing Tang;Yuqing Lai;S. Funari;R. Gehrke;Yongfeng Men
中科院分区：
文献类型：
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作者：
Zhiyong Jiang;Y. Sun;Yujing Tang;Yuqing Lai;S. Funari;R. Gehrke;Yongfeng Men
研究了III型全同立构聚（1-丁烯）的相转变随温度的变化。该聚合物从乙酸异戊酯的稀溶液中等温沉淀，并用实时同步辐射小角和广角X射线散射技术进行观察。结果证实，晶型III的多晶型转变强烈依赖于温度。从III型到I'型的相转变在约20 ℃的温度下进行。80摄氏度这是伴随着两个明显不同的层状周期性所产生的形式III和I'晶体，分别存在。III型和I'型晶体的共存可持续至103 ℃，随后熔融并重结晶成II型晶体。最后，II型晶体产生的反射在118 ℃消失。
The phase transformation of form III isotactic poly(1-butene) was investigated as a function of temperature. The polymer was isothermally precipitated from a dilute solution in iso-amyl acetate and observed with real-time synchrotron small- and wide-angle X-ray scattering techniques. The results confirmed that the polymorphic transition of form III was strongly dependent on temperature. The phase transformation from form III to form I' proceeded at a temperature of ca. 80 degrees C. This was accompanied by the presence of two distinctly different lamellar periodicities arising from form III and I' crystals, respectively. The coexistence of form III and I' crystals can persist up to 103 degrees C, followed by melting and recrystallizing into form II crystals. Finally, the reflections resulting from form II crystals disappeared at 118 degrees C.