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首页> 外文期刊>Journal of Applied Polymer Science >Rheologically determined phase diagram of poly(epsilon-caprolactone)/poly(styrene-co-acrylonitrile) blends: Role of ramp rate in dynamic measurements
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Rheologically determined phase diagram of poly(epsilon-caprolactone)/poly(styrene-co-acrylonitrile) blends: Role of ramp rate in dynamic measurements

机译：聚（ε-己内酯）/聚（苯乙烯 - 共丙烯腈）共混物的流变确定的相图：斜坡率在动态测量中的作用

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摘要

The phase behavior of poly(epsilon-caprolactone) (PCL)/poly(styrene-co-acrylonitrile) (SAN) blends, with a lower critical solution temperature (LCST)-type phase diagram over a virtual upper critical solution temperature (UCST) one, was investigated through thermal analysis and dynamic rheological measurements as a function of ramp rate. The LCST phase diagram was detected rheologically from the observed slope changes in the dynamic temperature ramps of storage modulus (G '). The determined phase transition points along with the spinodal temperatures, which are estimated based on the theoretical approach of Ajji and Choplin's mean field theory, shift to higher temperatures by reducing the ramp rate. The detected shifts show a composition dependency. Far away from the critical point, the phase transition temperatures of PCL/SAN blends change more noticeably, which originates from the smaller magnitude of concentration fluctuations in the metastable region and the stronger competition between the phase dissolution and cooling rate. The Flory-Huggins interaction parameter (chi) was appropriately adjusted into the LCST phase boundary as a function of temperature and composition. The results confirmed that the adjusted chi has higher temperature dependency at larger ramp rate of the dynamic measurements. The experimentally combined LCST and UCST phase behavior were also verified by the compressible regular solution model. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47750.
机译：聚（ε-己内酯）（PCL）/聚（苯乙烯 - 共丙烯腈）（SAN）混合物的相行为，在虚拟上临界溶液温度（UCST）上具有较低的临界溶液温度（LCST）型相位图一种，通过热分析和动态流变测量来研究作为坡道率的函数。从储存模量（G'）的动态温度斜坡中的观察到的斜率变化是流变学的流动检测到LCST相图。确定的相变点以及旋转透镜温度，基于AJJI和斩卧性的平均场理论的理论方法估计，通过降低坡道率来转向更高的温度。检测到的换档显示了构成依赖性。远离临界点，PCL / SAN混合物的相变温度更大地变化，从亚稳地区的浓度波动源于较小的浓度波动以及相位溶解和冷却速率之间的竞争力较强。根据温度和组成的函数适当地调节到LCST相边界中的液体 - Huggins相互作用参数（CHI）。结果证实，调整后的CHI处具有较高的动态测量坡度升高的温度依赖性。通过可压缩的常规解决方案模型还验证了实验组合的LCST和UCST相行为。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47750。

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