β-Phase Crystallization of Poly(vinylidene fluoride) in Poly(vinylidene fluoride)/Poly(ethyl methacr

• 作 者: Zi-Jie Huang Jing Jiang Gi Xue Dong-Shan Zhou
• 机 构: Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Key Lab
• 出 处: 高分子科学（英文版）
• 发表日期: 2019年1期
• 关键词: β-Crystal of PVDF Mesophase PVDF/PEMA blend Ultra-fast scanning calorimetry

The nature of the crystalline phase of poly(vinylidene fluoride) (PVDF) in compatible blends with poly(ethyl methacrylate) (PEMA) was investigated by using X-ray diffraction (XRD), infrared microscopy (IR) and differential scanning calorimetry (DSC). The βphase of PVDF was observed after quenching from the melt and further annealing above the glass transition temperature over a composition range. The PVDF/PEMA blend with weight ratio of 3:2 has formed higher content of PVDF β crystals than others. By taking advantage of fast cooling rate of ultrafast differential scanning calorimeter (UFDSC), the quenching process of blends was modeled and tested simultaneously, and the melting behavior of β crystals in all blends was investigated. Three types of crystallization behavior of βphase PVDF in blends were found after quenching-annealing at different temperatures.