Deformation-induced phase transition of Form II to Form I in polybutene-1 (PB-1) has been investigated by time-resolved Fourier transform infrared (FTIR) spectroscopy over a wide temperature range from 25 °C to 105 °C. The initial film sample containing orientated lamellae is prepared by pre-stretching of PB-1 melt followed by solidification. This is to realize a homogeneity of subsequent deformation at the mesoscale of lamellar stacks by avoiding large-scale spherulites. The deformation induced phase transition is recognized to occur with two stages: first, Form II undergoes the lamellar fragmentation, slipping or local melting after yielding to activate its transition to Form I, which may be realized by releasing the restrictions on chains translational movements in crystalline phase; second, the phase transition proceeds with a continuous dissipation of external work and determines the tensile mechanical response of film. To quantify the relationship between crystalline transition of Form II to Form I and external tensile field, a simple kinetic equation is well established based on FTIR measurement. The equation can describe not only the dependence of crystal transitional degree on applied specific work, but also the retardation effect of elevating temperature on phase transition.

在25°C至105°C的宽温度范围内，通过时间分辨傅立叶变换红外（FTIR）光谱研究了聚丁烯1（PB-1）中由晶型II到晶型I的形变诱导相变。通过预拉伸PB-1熔体，然后固化，可以制备出包含取向薄片的初始薄膜样品。这是通过避免大尺寸的球晶来实现层状堆叠中尺度上后续变形的均匀性。形变诱导的相变被认为是分两个阶段发生的：首先，形式II在屈服以激活其向形式I的转变后经历了层状断裂，滑移或局部熔化，这可以通过释放对晶体中链的平移运动的限制来实现相; 第二，相变随着外部功的不断耗散而进行，并决定了薄膜的拉伸机械响应。为了量化从晶型II到晶型I的晶体转变与外部拉伸场之间的关系，基于FTIR测量很好地建立了一个简单的动力学方程。该方程不仅可以描述晶体跃迁度对所施加的比功的依赖性，而且可以描述升高温度对相变的延迟效应。