青岛科技大学  English 
张建明
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教师拼音名称:zhangjianming

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Achieving superior pyroresistive reproducibility at HDPE/PVDF composites with tailored conductive phase size

关键字:POSITIVE TEMPERATURE-COEFFICIENT; ELECTRICAL-CONDUCTIVITY; POLYMER COMPOSITES; CARBON-BLACK; NANOCOMPOSITES; PERFORMANCE; BLENDS; POLYANILINE; MORPHOLOGY; NANOTUBES

摘要:Commercial conductive polymer composites (CPCs) with positive temperature coefficient (PTC) behavior usually suffer from inherent poor reproducibility of pyroresistive property. Herein, a conductive carbon black (CB)/high density polyethylene (HDPE)/polyvinylidene fluoride (PVDF) composite with outstanding PTC reproducibility were prepared through introducing cellulose nanocrystals (CNCs) grafted with methyl methacrylate (CNC-g-PMMA). Following the minimum interfacial energy mechanism, the CNC-g-PMMA tends to locate in PVDF of binary polymer composites. A much finer morphology of conductive CB/HDPE phase is hence obtained owing to the increasement of PVDF/HDPE viscosity ratio by introducing CNC-g-PMMA. Undergoing multiple repeated temperature cycles, the room temperature resistance and PTC intensity of as-prepared material keep almost unchanged, which demonstrates superior PTC reproducibility. The improving mechanism of PTC reproducibility has also been illustrated in detail. This research provides a facile and valid strategy to enhance the PTC reproducibility and will vastly expand the application of PTC composites in the field of intelligent temperature management.

卷号:45

期号:2

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