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Structure And Properties Of PS-b-PMTFPS Diblock Copolymers

Posted on:2006-10-09Degree:MasterType:Thesis
Country:ChinaCandidate:L B HuangFull Text:PDF
GTID:2121360152971805Subject:Applied Chemistry
Abstract/Summary:PDF Full Text Request
AB diblock copolymers are the polymers coupling of two different homopolymers by chemical bond. When AB diblock copolymers are composed of the different main bond , such as C-C and Si-O, the polymers will show the ordered microphase separation structure and physical chemical properties. Based on obtaining a low surface tension polymer with especially microphase separation structure, a well-defined PS-b-PMTFPS diblock copolymers is synthesized by anionic polymerization with monomer styrene and l,3,5-methyl-l,3,5- (3',3',3'-trifluoropropy)siloxane. the molecular structure microphase morphologies and surface properties is measured. Futhermore, the surface properties of PS/PS-b-PMTFPS blend system has also studied. The results show as follows:The composition of two block is measured by using 'H-NMR. DSC study show that diblock copolymers have two glass transition temperature,Tg pmtfps varies from -65℃ to -69℃.Microphase separation structure of diblock copolymers is observed by using of transmission electron microscope(TEM). And the effections of molecular, composition and solvent to microphase morphologies are studied.In this paper, we study the change of suface tension to fluorinated chain content. Result shows that fluorinated chain content on polymer surface is increasing with PMTFPS content.This paper also study the effects of fluorinated chain annealing temperature annealing time and solvent to the polymers surface properties in PS/PS-b-PMTFPS blend system. The result shows that the polymers have perfect water and oil repellency due to the fluorinated chain's enrichment on blends surface, even in low fluorinated chain content. The annealing treatment can improve the effect of water and oil repellency, particularly at low fluorinated chain content.
Keywords/Search Tags:PS-b-PMTFPS, diblock, copolymers, microphase, separation, structure, surface tension, contact angle, blends
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