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首页> 外文期刊>Journal of Applied Polymer Science >Specific heat and thermal diffusivity of vinylidene fluoride/trifluoroethylene copolymers
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Specific heat and thermal diffusivity of vinylidene fluoride/trifluoroethylene copolymers

机译：偏二氟乙烯/三氟乙烯共聚物的比热和热扩散率

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摘要

The specific heat (C) and thermal diffusivity (D) of vinylidene fluoride (VDF)/trifluoroethylene copolymers with 70 and 56 mol % of VDF were measured between 200 and 390 K, and the thermal conductivity (K) was calculated from these data. C, D, and K were rather insensitive to the VDF content but varied significantly with the crystallinity. At room temperature, as the crystallinity increased from about 55 to 85%, C decreased by 17%, and D and K increased by 60 and 40%, respectively. For the copolymer with 70 mol % VDF, C exhibited a broad peak, whereas D showed an abrupt drop at the ferroelectric-paraelectric transition near 370 K on heating. The transition temperature on cooling was about 40 K below that observed in the heating run, thus revealing a large thermal hysteresis. For the copolymer with 56 mol % VDF, the transition temperature was much lower, the transition region was narrower, and the thermal hysteresis was barely observable. (C) 2003 Wiley Periodicals, Inc. [References: 27]
机译：在200至390K之间测量了具有70和56mol％的VDF的偏二氟乙烯（VDF）/三氟乙烯共聚物的比热（C）和热扩散率（D），并且从这些数据计算出导热率（K）。 C，D和K对VDF含量不敏感，但随结晶度变化很大。在室温下，随着结晶度从约55％增至85％，C降低了17％，D和K分别提高了60％和40％。对于具有70mol％VDF的共聚物，C显示出宽峰，而D在加热时在370K附近的铁电-顺电转变处显示出急剧下降。冷却时的转变温度比加热运行时观察到的转变温度低约40 K，因此显示出较大的热滞后。对于具有56 mol％VDF的共聚物，其转变温度要低得多，转变区域要窄，并且几乎不能观察到热滞现象。 （C）2003 Wiley Periodicals，Inc. [参考：27]

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