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首页> 外文期刊>Journal of Applied Polymer Science >Viscoelastic and Pressure-Volume-Temperature Properties of Poly(vinylidene fluoride) and Poly(vinylidene fluoride)-Hexafluoropropylene Copolymers
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Viscoelastic and Pressure-Volume-Temperature Properties of Poly(vinylidene fluoride) and Poly(vinylidene fluoride)-Hexafluoropropylene Copolymers

机译：聚偏氟乙烯和聚偏氟乙烯-六氟丙烯共聚物的粘弹性和压力-体积-温度特性

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摘要

The relationship between the pressure, volume, and temperature (PVT) of poly(vinylidene fluoride) homopolymers (PVDF) and poly(vinylidene fluoride)-hexaflu-oropropylene (PVDF-HFP) copolymers was determined in the pressure range of 200-1200 bar and in the temperature range of 40 deg C-230 deg C. The specific volume was measured for two homopolymers having a molecular weight (M_w) of 160,000-400,000 Da and three copolymers containing between 3 and 11 wt % HFP with a molecular weight range of 320,000-480,000 Da. Differential scanning calorimetry (DSC) was used to simulate the cooling process of the PVT experiments and to determine the crystallization temperature at atmospheric pressure. The obtained results were compared to the transitions observed during the PVT measurements, which were found to be pressure dependent. The results showed that the specific volume of PVDF varies between 0.57 and 0.69 cm~3/g at atmospheric pressure, while at high pressure (1200 bar) it varies between 0.55 and 0.64cm~3/g. For the copolymers, the addition of HFP lowered its melting point, while the specific volume did not show a significant change. The TAIT state equation describing the dependence of specific volume on the zero-pressure volume (V_o,T), pressure, and temperature has been used to predict the specific volume of PVDF and PVDF-HFP copolymers. The experimental data was fitted with the state equation by varying the parameters in the equation. The use of the universal constant, C (0.0894), and as a variable did not affect the predictions significantly.
机译：在200-1200 bar的压力范围内确定了聚偏二氟乙烯均聚物（PVDF）和聚偏二氟乙烯-六氟-原丙烯共聚物（PVDF-HFP）的压力，体积和温度（PVT）之间的关系测量两种分子量（M_w）为160,000-400,000 Da的均聚物和三种分子量范围在3至11 wt％的HFP的共聚物的比容，测量温度范围为40℃至230℃。 320,000-480,000达差示扫描量热法（DSC）用于模拟PVT实验的冷却过程，并确定大气压下的结晶温度。将获得的结果与PVT测量期间观察到的转变进行比较，发现转变与压力有关。结果表明，在大气压下，PVDF的比容在0.57至0.69 cm〜3 / g之间变化，而在高压（1200 bar）下，其在0.55至0.64cm〜3 / g之间变化。对于共聚物，HFP的添加降低了其熔点，而比容没有显示出明显的变化。描述比体积对零压力体积（V_o，T），压力和温度的依赖性的TAIT状态方程已用于预测PVDF和PVDF-HFP共聚物的比体积。通过改变方程式中的参数，将实验数据与状态方程式拟合。使用通用常数C（0.0894）和作为变量不会显着影响预测。

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