Abstract Ultra-high-molecular-weight polyethylene (UHMWPE) microporous membrane is generally prepared by thermally induced phase separation process. The phase separation process is closely related to the cooling process in practical production. In this paper, the phase separation temperature of UHMWPE/liquid paraffin blends was explored by the hot-stage-optical device and differential scanning calorimeter (DSC), and the result showed that the temperature was about 105–125 °C. The effects of cooling condition and crystallization ability of UHMWPE on the separation process of the blends were also investigated by DSC. The results showed that the phase separation was affected by the cooling rates rather than the initial cooling temperature. And the crystallization of UHMWPE was mainly limited by the nucleating at a low cooling rate, which could form larger porous structure. In a word, it should be inspirational for the actual production of the UHMWPE microporous membrane. Graphical abstract The solid–liquid phase separation will occur in the cooling process of UHMWPE/LP blends, which is driven by the external temperature difference. It is significant to understand the phase separation process. In this paper, the effects of the melting properties and cooling condition on phase separation process were investigated, the S–L phase separation range is at 105–125 °C, and the speed of phase separation is mainly related to the external temperature difference and the UHMWPE content. It could be inspirational for actual production of the UHMWPE membrane with more uniform pore structure.

中文翻译：

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冷却过程对超高分子量聚乙烯/液体石蜡混合物固液相分离过程的影响

摘要 超高分子量聚乙烯（UHMWPE）微孔膜一般采用热致相分离工艺制备。相分离过程与实际生产中的冷却过程密切相关。本文利用热台光学装置和差示扫描量热仪(DSC)对UHMWPE/液体石蜡共混物的相分离温度进行了研究，结果表明温度约为105-125°C。还通过DSC研究了UHMWPE的冷却条件和结晶能力对共混物分离过程的影响。结果表明，相分离受冷却速率而不是初始冷却温度的影响。UHMWPE的结晶主要受低冷却速率下的成核限制，可以形成更大的多孔结构。总之，应该对UHMWPE微孔膜的实际生产有启发。图形摘要 UHMWPE/LP共混物在冷却过程中会发生固液相分离，这是由外部温差驱动的。了解相分离过程很重要。本文研究了熔融特性和冷却条件对相分离过程的影响，S-L相分离范围在105-125℃，相分离的速度主要与外界温差和UHMWPE 含量。它可能对实际生产具有更均匀孔结构的 UHMWPE 膜具有启发意义。应该对UHMWPE微孔膜的实际生产有启发。图解摘要 UHMWPE/LP共混物在冷却过程中会发生固液相分离，这是由外部温差驱动的。了解相分离过程很重要。本文研究了熔融特性和冷却条件对相分离过程的影响，S-L相分离范围在105-125℃，相分离的速度主要与外界温差和UHMWPE 含量。它可能对实际生产具有更均匀孔结构的 UHMWPE 膜具有启发意义。应该对UHMWPE微孔膜的实际生产有启发。图形摘要 UHMWPE/LP共混物在冷却过程中会发生固液相分离，这是由外部温差驱动的。了解相分离过程很重要。本文研究了熔融特性和冷却条件对相分离过程的影响，S-L相分离范围在105-125℃，相分离的速度主要与外界温差和UHMWPE 含量。它可能对实际生产具有更均匀孔结构的 UHMWPE 膜具有启发意义。这是由外部温差驱动的。了解相分离过程很重要。本文研究了熔融特性和冷却条件对相分离过程的影响，S-L相分离范围在105-125℃，相分离的速度主要与外界温差和UHMWPE 含量。它可能对实际生产具有更均匀孔结构的 UHMWPE 膜具有启发意义。这是由外部温差驱动的。了解相分离过程很重要。本文研究了熔融特性和冷却条件对相分离过程的影响，S-L相分离范围在105-125℃，相分离的速度主要与外界温差和UHMWPE 含量。它可能对实际生产具有更均匀孔结构的 UHMWPE 膜具有启发意义。而相分离的速度主要与外界温差和UHMWPE含量有关。它可能对实际生产具有更均匀孔结构的 UHMWPE 膜具有启发意义。而相分离的速度主要与外界温差和UHMWPE含量有关。它可能对实际生产具有更均匀孔结构的 UHMWPE 膜具有启发意义。