Uchida Shoya, Ishige Ryohei, Ando Shinji
Department of Chemistry and Material Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
Polymers (Basel). 2017 Jul 2;9(7):263. doi: 10.3390/polym9070263.
Phase-separated polymer blend composite films exhibiting high thermal diffusivity were prepared by blending a soluble polyimide (BPADA-MPD) and a bismaleimide (BMI) with needle-shaped zinc oxide (n-ZnO) particles followed by high-temperature curing at 250 °C. Images recorded with a field-emission scanning electron microscope (FE-SEM) equipped with wavelength-dispersive spectroscopy (WDS) demonstrated that the spontaneously separated phases in the composite films were aligned along the out-of-plane direction, and the n-ZnO particles were selectively incorporated into the BMI phase. The out-of-plane thermal diffusivity of the composite films was significantly higher than those of the previously reported composite films at lower filler contents. Based on wide-angle X-ray diffraction (WAXD) patterns and image analysis, the enhanced thermal diffusivity was attributed to the confinement of the anisotropically shaped particles and their nearly isotropic orientation in one phase of the composite films.
通过将可溶性聚酰亚胺（BPADA-MPD）和双马来酰亚胺（BMI）与针状氧化锌（n-ZnO）颗粒混合，然后在250°C下高温固化，制备出了具有高热扩散率的相分离聚合物共混复合薄膜。用场发射扫描电子显微镜（FE-SEM）配备波长色散光谱仪（WDS）记录的图像表明，复合薄膜中自发分离的相沿面外方向排列，并且n-ZnO颗粒被选择性地掺入BMI相中。在较低填料含量下，复合薄膜的面外热扩散率显著高于先前报道的复合薄膜。基于广角X射线衍射（WAXD）图谱和图像分析，热扩散率的提高归因于复合薄膜一相中各向异性形状颗粒的限制及其近乎各向同性的取向。
