Polymorphic transformation from the form II to form I crystal was investigated for isotactic polybutene-1 (PB) and butene-1/ethylene copolymers (PBE) with differential scanning calorimetry (DSC) and dielectric response spectroscopy (DRS). DRS detected the so-called α relaxation of segments within the amorphous phase, and DSC traced a degree of form II to I transformation with time. It turned out that incorporation of the ethylene comonomers in PBE suppressed the crystallization and plasticized the amorphous phase, and the II to I transformation was greatly accelerated in particular at low T close to T_g. To normalize T_g enabled normalization of the α relaxation frequency (detected in DRS), but not the II to I transformation rate (detected in DSC): extra acceleration was noted for samples with a number fraction of ethylene monomers of 4.3% or higher. The extra acceleration is attributed to (1) heterogeneity of segmental mobility that facilitates the crystal growth and (2) crystal defects accumulating at the fold surface that cause internal stress to accelerate the nucleation.

用差示扫描量热法（DSC）和介电响应光谱法（DRS）研究了等规聚丁烯1（PB）和丁烯1 /乙烯共聚物（PBE）从II型到I型晶体的多晶型转变。DRS检测到了非晶相中链段的所谓α弛豫，DSC随时间追踪了从II型到I型的一定程度的转变。结果表明，在PBE中引入乙烯共聚单体抑制了结晶并塑化了无定形相，特别是在接近T _g的低T下，II-I转化得到了极大的促进。为了归一化T _g，可以对α进行归一化弛豫频率（在DRS中检测到），而不是II到I转化率（在DSC中检测到）：对于乙烯单体数量分数为4.3％或更高的样品，存在额外的加速度。额外的加速度归因于（1）促进晶体生长的分段迁移率的异质性，以及（2）褶皱表面积聚的晶体缺陷，这些缺陷导致内部应力加速成核。