Fabrication Of Superhydrophobic Textiles By POSS Polymer Modified Fibers

Superhydrophobic textiles are favored by researchers because of their application in areas of self-cleaning,anti-corrosion,and liquid separation.Currently,most of the superhydrophobic fabrics are susceptible to superhydrophobic properties due to external influences,such as physical friction,mechanical washing,ultraviolet light,and organic solvents.Therefore,it is significance of preparing superhydrophobic textiles that can resistant to physical friction and mechanical stability.In view of the fact that octavinyl POSS(OVPOSS)is a nano-sized organic-inorganic hybrid particle with good mechanical properties and thermal stability.Besides,vinyl functional group has high activity and Si element has a lower surface energy.This work uses OVPOSS as a bridge,cotton fabrics and polyester(PET)textiles as substrates,to fabricate durable superhydrophobic textiles through covalently grafted of POSS-based polymers and introduction of POSS-based elastomers polymers on the fiber surface,respectively.(1)3-Mercaptopropyl-triethoxysilane(MPTES)was fixed on the surface of cotton fibers by chemical vapor deposition to form a sulfhydryl initiation point on the surface of fibers.OVPOSS and tetrakis(3-mercaptopropionic acid)pentaerythritol ester(PETMP)were covalently connected with cotton fabrics via thiol-ene click chemical reaction,and therefore forming POSS-based polymers on the surface of the fibers and producing superhydrophobic textiles.Scanning electron microscopy(SEM)was used to observe the surface morphology of the fiber;the contact angle measuring instrument was used to quantitatively test the change of the surface wettability of the fiber,the photoelectron spectroscopy was used to detect the content of the surface element of the fiber and the chemical environment around the element.Exploring the amount of MPTES,OVPOSS,PETMP,DMPA and the duration of UV light have effect on superhydrophobicity of the fiber surface;The effect of physical friction,mechanical washing,ultraviolet light,common organic solvents and acid-base solutions with different pH values on superhydrophobic stability of cotton fabrics were conducted.The results show that the prepared superhydrophobic cotton fabrics by grafting of POSS-based polymers can be impregnated with 16 day acid,alkali,salt and 120 h acetone,N,N-dimethylformamide and other organic solvents,and can withstand long-time ultrasonic washing and 70 h ultraviolet irradiation.It exhibits excellent chemical resistance and antifouling properties.(2)Using PET as a substrate,dichloromethane as solvent,the "one-pot method" was used,under the initiation of DMPA,the thiol-ene click chemical reaction occurred between the side chain sulfhydryl-based PDMS(PDMS-SH)and OVPOSS and therefore forming of POSS-based elastomers polymers on fiber surface and obtaining a superhydrophobic textile.The surface of the fiber was analyzed by SEM;the surface wettability of the fiber was detected by contact angle measuring instrument.The effects of the amount of PDMS-SH,OVPOSS,DMPA,and the reaction time on the wettability of the fiber surface were investigated.The superhydrophobic stability of the treated fabric with POSS-based elastomers polymers was evaluated by physical rubbing,mechanical washing,ultraviolet light,impregnation with common organic solvents and acid-base solutions.The results show that the superhydrophobic fabric surface can resistant to 12 days of acid,alkali,salt solution soaking,84 h common organic solvent impregnation and 7 days of UV light irradiation.At the same time,the surface of the fabric can withstand 6000 physical frictions and 600 household water washes,showing excellent superhydrophobic stability.