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Synthesis and AO Resistant Properties of Novel Polyimide Fibers Containing Phenylphosphine Oxide Groups in Main Chain

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Chinese Journal of Polymer Science 2019年第1期37卷 59-67,1-3页

作者： Yong Zhao Hong Gao Guo-Min Li Fang-Fang Liu Xue-Min Dai Zhi-Xin Dong Xue-Peng Qiu Polymer Composites Engineering Laboratory Changchun Institute of Applied Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences China Academy of Space Technology

A series of co-polyimide(PI)fibers containing phenylphosphine oxide(PPO)group were synthesized by incorporating the bis(4-aminophenoxy)phenyl phosphine oxide(DAPOPPO)monomer into the PI molecular chain followed by dry-jet wet *** effects of DAPOPPO molar content on the atomic oxygen(AO)resistance of the fibers were investigated *** the AO fluence increased from 0to 3.2×1020the mass loss of the fibers showed the dependence on DAPOPPO molar content in co-PI *** PI fiber containing 40%DAPOPPO showed lower mass loss compared to those containing 0%and 20%*** higher AO fluence,the higher DAPOPPO content gave rise to dense carpet-like surface of *** results indicated that the passivated phosphate layer was deposited on the fiber surface when exposed to AO,which effectively prevented fiber from AO *** the DAPOPPO content increasing from 0%to 40%,the retentions of tensile strength and initial modulus for the fibers exhibited obvious growth from 44%to 68%,and 59%to 70%,after AO exposure with the fluence of 3.2×1020The excellent AO resistance benefits the fibers for application in low Earth orbit as flexible construction components.

关键词： Polyimide fibers Bis(4-aminophenoxy)phenyl phosphine oxide(DAPOPPO) dry-jet wet spinning AO resistance

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Preparation and Characteristics of Novel Fibers Based on Cellulose Acetate and Soy Lecithin for Attracting and Binding POPs

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Journal of Geoscience and Environment Protection 2015年第10期3卷 1-8页

作者： Jinxian Huo Zuopeng Li Yin Wang School of Chemistry & Environmental Engineering Shanxi Datong University Datong China The Key Laboratory of Water and Sediment Sciences Ministry of Education School of Environment Beijing Normal University Beijing China

Soy lecithin (SL)-modified cellulose acetate (L-CA) fibers for use as a novel biomimic material were prepared by a dry-jet wet spinning process from a solution of the polymer in dioxin. Characteristics of the L-CA fibers, such as structural properties, water absorbance, electrical conductivity and accumulation of trace persistent organic pollutants (POPs), were examined. Cross-sectional scanning electron microscopy (SEM) of L-CA unveiled a finger-like structure, along with a thin dense surface layer like that of CA. On the basis of X-ray photoelectron spectroscopic (XPS) observations, it was concluded that the enhancement of binding energy was optimum with 10% SL in the fiber, whereas superfluous SL led to self-assembly between the SL molecules, which weakened the binding between the SL and CA. Also, the L-CA fibers showed good water absorbance and a low charge conductivity in comparison to that of the non-modified CA fibers. Examination of the ability to accumulate POPs from water showed that L-CA is a effective candidate for the removal of micropollutants from aqueous solution.

关键词： Biomimic Material dry-jet Wet Spinning Accumulation Persistent Organic Pollutants

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