title: New Water Vapor Barrier Film Based on Lamellar Aliphatic-Monoamine-Bridged Polysilsesquioxane.
abstract: Siloxane-based hybrid lamellar materials with ordered nanostructure units paralleling to the substrate have been widely used for water vapor barrier. However, it is very difficult to control the orientation of the lamellar units at molecular level. In this Research Article, a new lamellar bridged polysilsesquioxane (BPSQ) film, whose voids between lamellae were filled by pendant alkyl chains in the organic bridge, was prepared via the stoichiometric reaction between 3-glycidoxypropyltrimethoxysilane and aliphatic monoamine at 60 °C without catalyst. Experimental evidence obtained from FT-IR, MS, NMR, and GIXRD techniques suggested that the as-prepared BPSQ films were constructed by lamellar units with disordered orientation. Nonetheless, they possessed satisfactory water vapor barrier performance for potassium dihydrogen phosphate (KDP) and deuterated potassium dihydrogen phosphate (DKDP) optical crystals, and the water vapor transmission rate through BPSQ film with thickness of 25 μm was as low as 20.3 g·m(-2)·d(-1). Those results proved that filling the voids between molecular lamellae with alkyl chains greatly weakened the effect of lamellar unit orientation on the vapor barrier property of BPSQ film.
authors.affiliation: Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan, 030001, China.|University of Chinese Academy of Sciences , Beijing, 100049, China.
authors.forename: Cong
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan, 030001, China.|University of Chinese Academy of Sciences , Beijing, 100049, China.
authors.forename: Ce
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan, 030001, China.
authors.forename: Ruimin
authors.initials: R
authors.lastname: Ding
authors.affiliation: Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan, 030001, China.|University of Chinese Academy of Sciences , Beijing, 100049, China.
authors.forename: Xinmin
authors.initials: X
authors.lastname: Cui
authors.affiliation: Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan, 030001, China.|University of Chinese Academy of Sciences , Beijing, 100049, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: Chengdu Fine Optical Engineering Research Center , Chengdu, Sichuan 610041, China.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences , Xi'an, 710119, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Xu
keywords: bridged polysilsesquioxane; lamellar polymer; protective film; water vapor barrier