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首页> 外文期刊>Journal of Applied Polymer Science >Poly(vinylidene fluoride)-acrylic rubber partially miscible blends: Phase behavior and its effects on the mechanical properties
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Poly(vinylidene fluoride)-acrylic rubber partially miscible blends: Phase behavior and its effects on the mechanical properties

机译：聚偏二氟乙烯-丙烯酸橡胶部分混溶共混物：相行为及其对机械性能的影响

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A phase diagram of poly(vinylidene fluoride) (PVDF) and acrylic rubber (ACM) was plotted, and the effects of the extent of miscibility on the mechanical properties of the polymer blends were examined. A compressible, regular solution model was used to forecast the phase diagram of this blend. The model prediction, the lower critical solution temperature (LCST) over the upper critical solution temperature (UCST), was done qualitatively according to the experimentally determined phase diagram by differential scanning calorimetry (DSC), optical microscopy, and rheological analysis. These experimental methods showed that this system was miscible in ACM-rich blends (>50% ACM) and partially miscible in PVDF-rich blends. A wide-angle X-ray diffraction study revealed that PVDF/ACM blends such as neat PVDF had a characteristic α-crystalline peak. The partially miscible blends displayed up to 350% elongation at break; this was a significant increment of this parameter compared to that of neat PVDF(20%). However, the miscible blends showed elongation of up to 1000% [again, a remarkable increase compared to chemically crosslinked ACM (220%)] and displayed excellent mechanical properties and tensile strength and a large elongation at break. For the miscible and partially miscible blends, two different mechanisms were responsible for this improvement in the mechanical properties. It was suggested that in the partially miscible blends, the rubbery depletion layer between the spherulite and the conventional rubber cavitations mechanism were responsible for the increase in the elongation at break, whereas for the miscible blends, the PVDF spherulite acted as a crosslinking junction. The stretched part of the tensile samples in the partially miscible blends showed characteristic β-crystalline peaks in the Fourier transform infrared spectra, whereas that in the miscible blends showed α-crystalline peaks.
机译：绘制了聚偏二氟乙烯（PVDF）和丙烯酸橡胶（ACM）的相图，并检查了混溶程度对聚合物共混物机械性能的影响。使用可压缩的常规溶液模型来预测此共混物的相图。根据实验确定的相图，通过差示扫描量热法（DSC），光学显微镜和流变分析，定性地完成了模型预测，即下临界溶液温度（LCST）高于上临界溶液温度（UCST）。这些实验方法表明，该系统可与富含ACM的混合物（> 50％ACM）混溶，而可与富含PVDF的混合物部分混溶。广角X射线衍射研究表明，PVDF / ACM共混物（如纯PVDF）具有特征性的α晶体峰。部分可混溶的共混物的断裂伸长率高达350％。与纯PVDF（20％）相比，此参数有显着增加。但是，可混溶的共混物显示出高达1000％的伸长率[再次，与化学交联的ACM（220％）相比显着增加]，并显示出优异的机械性能和拉伸强度以及较大的断裂伸长率。对于可混溶和部分可混溶的共混物，两种不同的机理导致了机械性能的改善。有人认为，在部分可混溶的共混物中，球晶与常规橡胶空化机理之间的橡胶耗尽层是导致断裂伸长率增加的原因，而对于可混溶的共混物，PVDF球晶起交联作用。部分可混溶共混物中拉伸样品的拉伸部分在傅立叶变换红外光谱中显示出特征性的β晶体峰，而在可混溶共混物中则显示出α晶体峰。

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