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Enhanced thermal conductivity in immiscible polyimide blend composites with needle-shaped ZnO particles

机译：具有针状ZnO颗粒的不混溶聚酰亚胺共混物的导热性增强

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摘要

Novel blend composite films were prepared by mixing two kinds of immiscible polyimides (PIs), one containing sulfur (SD) and one containing fluorine (TF), with needle-shaped zinc oxide (n-ZnO) particles. Optical microscopy and cross-sectional SEM images revealed that vertical double percolation (VDP) structures were successfully formed in the PI blend films by spontaneous macro-phase separation. In the VDP structures, each phase is separately aligned along the out-of-plane direction, and the n-ZnO particles were selectively incorporated in the TF-rich phase. These blend composite films exhibited significantly higher thermal conductivity (TC) in the out-of-plane direction than blend composite films containing pyramidal ZnO (p-ZnO) particles. The wide-angle X-ray diffraction (WAXD) results revealed that the n-ZnO particles were more randomly oriented in the blend films than those in homopolymer films, in which the particles were preferentially aligned parallel to the film. The n-ZnO particles confined in the VDP structures and partially oriented along the out-of-plane direction contributed to the enhancement of the out-of-plane TC.
机译：通过将两种不混溶的聚酰亚胺（PI）（一种含硫（SD）和一种含氟（TF））与针状氧化锌（n-ZnO）颗粒混合，制备出新型共混复合膜。光学显微镜和横截面SEM图像显示，通过自发宏观相分离在PI共混膜中成功形成了垂直双渗透（VDP）结构。在VDP结构中，各相沿着面外方向分别排列，并且将n-ZnO颗粒选择性地掺入到富含TF的相中。这些共混复合膜在平面外方向上的热导率（TC）显着高于包含金字塔形ZnO（p-ZnO）颗粒的共混复合膜。广角X射线衍射（WAXD）结果表明，共混薄膜中的n-ZnO颗粒比均聚物薄膜中的n-ZnO颗粒更无规取向，在均聚物薄膜中，n-ZnO颗粒优先与薄膜平行排列。被限制在VDP结构中并且部分地沿着面外方向取向的n-ZnO颗粒有助于面外TC的增强。

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