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Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation

机译:热诱导相分离法制备膜的过程中聚合物溶液的凝固行为

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The solidification behavior of poly(vinylidene fluoride) (PVDF) solution during membrane preparation by thermally induced phase separation (TIPS) was investigated. Apparatus newly developed in our laboratory was used to quantitatively measure membrane stiffness during phase separation. In this apparatus, a cooling polymer solution, placed on a stage, is moved upwards and the surface of the polymer solution contacts a sphere attached to the tip of a needle. The displacement of a blade spring attached to the needle is then measured by a laser displacement sensor. Different phase separation modes, such as liquid-liquid (L-L) phase separation and solid-liquid (S-L) phase separation (polymer crystallization) were investigated. In the case of S-L phase separation, the stiffness of the solution surface began to increase significantly just before termination of crystallization. In contrast, L-L phase separation delayed solidification of the solution. This was because mutual contact of the spherulites was obstructed by droplets of polymer-lean phase formed during L-L phase separation. Thus, the solidification rate was slower for the L-L phase separation system than for the S-L phase separation system.
机译:研究了聚偏二氟乙烯(PVDF)溶液在通过热诱导相分离(TIPS)制膜过程中的固化行为。我们实验室新开发的设备用于定量测量相分离过程中的膜刚度。在该装置中,放置在台上的冷却聚合物溶液向上移动,并且聚合物溶液的表面接触附接到针尖的球体。然后通过激光位移传感器测量安装在针头上的板簧的位移。研究了不同的相分离模式,例如液-液(L-L)相分离和固-液(S-L)相分离(聚合物结晶)。在S-L相分离的情况下,溶液表面的刚度在即将终止结晶之前就开始显着增加。相反,L-L相分离延迟了溶液的固化。这是因为在L-L相分离过程中形成的贫聚合物相液滴阻碍了球晶的相互接触。因此,L-L相分离系统的固化速率比S-L相分离系统的固化速率慢。

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