黏性包覆原理用于制备iPP/PE⁃HD/iPP三层微孔膜

doi:10.19491/j.issn.1001-9278.2020.05.002

中国塑料 ›› 2020, Vol. 34 ›› Issue (5): 9-15.DOI: 10.19491/j.issn.1001-9278.2020.05.002

黏性包覆原理用于制备iPP/PE⁃HD/iPP三层微孔膜

张娅, 丁超, 陈文博, 杨鸣波()

四川大学高分子科学与工程学院，高分子材料工程国家重点实验室，成都 610065

收稿日期:2020-02-18 出版日期:2020-05-26 发布日期:2020-05-26
基金资助:
国家自然科学基金(5172109)

Preparation of iPP/PE⁃HD/iPP Trilayer Microporous Membranes Through Viscous Encapsulation

Ya ZHANG, Chao DING, Wenbo CHEN, Mingbo YANG()

College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China

Received:2020-02-18 Online:2020-05-26 Published:2020-05-26
Contact: Mingbo YANG E-mail:yangmb@scu.edu.cn

摘要/Abstract

摘要：

利用“黏性包覆”原理，通过毛细管流变仪详细研究了多相体系在流场中的分相机制和控制方法，基于单螺杆挤出流延机组制备了具有等规聚丙烯/高密度聚乙烯/等规聚丙烯（iPP/PE?HD/iPP）结构的三层膜。结果表明，将iPP、PE?HD预混，可以得到不同相结构的iPP/PE?HD共混膜；三层片材中PE?HD的实际面积为94 %，三层膜的孔隙率可达51.82 %，含有25 % iPP的具有双连续相结构的共混膜的微孔分布更加均匀；研究发现牵引比为50时，大孔含量高达84 %；探究了共混微孔膜的成孔机理，揭示了三层膜中iPP和PE?HD过渡层成孔的复杂性，论证了过渡层晶体结构和微孔形貌对三层膜性能的重要性。

关键词: 三层微孔膜, 黏性包覆, 相分离

Abstract:

The mechanisms of phase separation and control method of multiphase system in the flow field were studied by capillary rheometer, and then a series of isotactic polyethylene (iPP)/polyethylene (PE?HD)/iPP trilayer blend membranes were prepared by a casting method according to a viscous encapsulation principle. The blend membranes with different phase structures were obtained by premixing iPP with PE?HD. The results indicated that the actual area of PE?HD in the blend membranes was 94 % and the porosity of blend membranes was as high as 51.82 %. The blend membrane containing 25 wt% iPP exhibited a more uniform distribution in pore size, and its macropore content was 84 % when the draw ratio reached 50 times. The study of formation mechanism for complex pores indicated that there was a complexity in the formation of intermediate layer in the blend membranes. Moreover, this work also confirmed the importance of crystalline structure and microporous morphology of the interfacial layer upon the properties of the blend membranes.

Key words: trilayer microporous membrane, viscous encapsulation, phase separation

中图分类号:

TQ325.1

张娅, 丁超, 陈文博, 杨鸣波. 黏性包覆原理用于制备iPP/PE⁃HD/iPP三层微孔膜[J]. 中国塑料, 2020, 34(5): 9-15.

Ya ZHANG, Chao DING, Wenbo CHEN, Mingbo YANG. Preparation of iPP/PE⁃HD/iPP Trilayer Microporous Membranes Through Viscous Encapsulation[J]. China Plastics, 2020, 34(5): 9-15.

图/表 12

图1 材料的流变学性能

Fig.1 Rheological properties of the selected materials

图2 不同长径比下样品的PLM照片

Fig.2 PLM of samples with different ratios of length to diameter

图3 不同长径比下样品的Ap

Fig.3 Ap of samples with different ratios of length to diameter

图4 不同加工方法形成的包覆结构

Fig.4 Encapsulation structures from different methods

图5 退火时间对三层膜孔隙率的影响

Fig.5 The influence of annealing time on the porosity of the trilayer microporous membrane

图6 黏性包覆法制备的三层微孔膜和商用三层微孔膜的截面图

Fig.6 The cross section of tri?layer microporous membrane of this method and coextrusion

图7 不同iPP/PE?HD共混物的表面形貌照片

Fig.7 Surface morphology of different iPP/PE?HD blends with different mass ratios

图 8 不同牵引比下P50和P25预制膜和微孔膜的表面形貌

Fig.8 SEM of surface morphology of precursor film and microporous membrane of specimens P50 and P25 with different draw ratios

图9 不同牵引比下P25预制膜的DSC曲线

Fig.9 DSC curves of the precursors P25 with different draw ratios

牵引比	PE?HD		iPP
牵引比	T_m/℃	X_C/%	T_m/℃	X_C/%
30	128.89	61.25	165.89	44.50
40	129.36	61.80	165.80	46.96
50	129.50	63.30	165.58	44.91

表1 不同牵引比下P25样品中PE?HD和iPP的Tm和XC

Tab.1 The melting point and crystallinity of PE?HD and iPP of the specimens P25 with different draw ratios

图10 2种微孔膜的表面形貌

Fig.10 Surface morphology of two kinds of microporous membranes

图11 共混微孔膜和三层微孔膜的孔径统计

Fig.11 The micropore analysis of blend microporous membrane and trilayer microporous membrane

参考文献 11

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黏性包覆原理用于制备iPP/PE⁃HD/iPP三层微孔膜

Preparation of iPP/PE⁃HD/iPP Trilayer Microporous Membranes Through Viscous Encapsulation

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