Synthesis And Surface Structure Of Poly(aryl Ether)s Containing Fluoro And Linear Organosilicon

Hydrophobic materials,as an important multifunctional material,have attracted much attention not only in the basic research field but also in its practical application.Due to its bio-inspired properties such as self-cleaning and anti-smearing,polar and non-polar separation of chemical components,oil-water separation,application of batteries and fuel cells,daily-use packaging,moisture-proof coating of biomedical and electronic equipment,etc.is widely used.Because of its low surface energy,high chemical stability,high thermal stability,hydrophobicity and lipophobicity,fluorinated polymers materials stand out in many hydrophobic materials.The perfluorinated poly(arylene ether)materials not only ensure a high fluorine content in the polymer,but also keep good thermodynamic properties.However,in practical applications,the hydrophobic materials containing fluorine generally have high crystallinity,so the processing performance is poor,and it is necessary to introduce other elements or functional groups to improve the processability of the materials.Linear polydimethylsiloxane(PDMS)is the most widely used polyorganosilicon compound,its siloxane structure gives it not only lower surface energy,but also better heat resistance,resistance impact and processability.Introducing PDMS into polyfluorinated poly(aryl ether)materials not only maintains the “three high and two sparsity” of fluoropolymers,but also has the characteristics of low surface free energy,heat resistance,cold resistance,aging resistance,and easy processing of organic silicon compounds.In this paper,a series of bisphenol PDMS monomers with different chain lengths were prepared by chain extension reaction and hydrosilylation.A series of poly(arylene ether)s with different chain lengths of PDMS in the main chains(DFP-PDMS-P)and three poly(arylene ether)s with 10 silicons and different structures in the main chains(DFPX-PDMS-10)were successfully synthesized by the two-step nucleophilic substitution reaction.The structure of the polymers were characterized by FTIR,H-NMR,F-NMR and XRD.All the polymers showed a linear and amorphous structure.At the same time,the polymers were tested for solubility,thermal properties and hydrophobic properties.All polymers showed good solubility,hydrophobicity and thermal stability.For the polymers of DFP-PDMS-P,with the increased of silicon numbers in PDMS,the glass transition temperature decreased from 51.2 ? to 34.3 ?,and its water contact angle increased from 108 ° to 112 °(DFP-PDMS-10),and then decreased to 102 °.For the polymers of DFPX-PDMS-10,the glass transition temperature decreased from 45.3?(DFP-PDMS-10)to 42.5?(DFPK-PDMS-10)as the polarity of functional groups in the polymer molecules increased.Also,the water contact angle decreased from 112° to 107°.In addition,in order to explored the influence of the surface microstructure on the hydrophobic properties materials,a series of polymer materials with different surface structures and different surface roughnesses were prepared by spin coating which used three kinds of prepared polymers(DFP-PDMS-6,DFP-PDMS-10,DFP-PDMS-16).Through scanning electron microscopy and surface elemental analysis,the polymer successfully covered the substrate and all materials had different surface microstructures.The degree of contact angle and the change trend of the curve was basically consistent for the same microstructural structure of the three kinds of polymers,in which the micron array structure of the contact angle up to 141 °.With the increased of polymer surface roughness of the same polymer,the water contact angle increased.And the maximum contact angle reached 134°.The results were consistent with the Cassie-Baster theory.