羟基含量对羟基化聚丙烯共混预制膜亲水性能的影响

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中图分类号：TB34 文献标志码：A

Effect of Hydroxyl Content on Hydrophilic Properties of Hydroxylated Polypropylene Prefabricated Blend Membranes

YANGJinghao1，LI Hao1，LIMingyuan1.2， CAI Zhengguo1.2，CHENLong1.2， SUNJunfen1.2 （1.College ofMaterials Science and Engineering; 2. State Key Laboratory of Advanced Fiber Materials， DonghuaUniversity，Shanghai 201620，China）

Abstract：The performanceof lithium-ion batery prefabricated membranes has an important influence onthe performance of the separators.Functionalized polypropylene （PPOH） with hydroxyl contents （mole fractions， xOH， of 0.5% ， 1.2% ， 3.0% and 6.2% was successfully prepared via the copolymerization reaction of 10-undecen-1-ol with propylene. PPOH at diferent hydroxylcontents was melt-blended with polypropylene （PP）to investigate theefect of hydroxylcontenton the properties of the prefabricated blend membrane.The chemical structure of PPOH wascharacterized by proton nuclear magnetic resonance （H-NMR）and Fourier transform infrared spectroscopy （FT-IR）.The hydrophilicity，mechanical properties，andsurface morphologyof the prefabricated blend membranes were evaluated.Theresults indicate that with the increasing of hydroxyl contentin PPOH，the hydrophilicityof the prefabricated blend membrane improves.However，excessvelyhighhydroxyl contentleads toenhanced incompatibilitybetweenthe PPOHandPPphases，resulting inareduction inmechanical properties.When xOH is 1.2% ，theblended membraneexhibitsatensilestrengthof 36.4MPa ，anelongationatbreakof 269.6% ，awater contact angle of 92.7∘ ，and a crystallinity of 50.4% .This study provides a guideline for separator preparation and a novel strategy for the hydrophilic modification of lithium-ion battery separators.

Key words： hydroxyl content;prefabricated blend membrane；hydroxylated polypropylene;compatibility；melt blending

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