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Aggregate 2023年第6期4卷 200-208页

作者： Qiao-Xi Yu Run-Xin Bei Jia-Hui Liu Yan-Wei He Si-Wei Liu Zhen-Guo Chi Jia-Rui Xu Yi Zhang PCFM Lab GD HPPC LabGuangdong Engineering Technology Research Centre for High-performance Organic and Polymer Photoelectric Functional FilmsState Key Laboratory of Optoelectronic Materials and TechnologiesSchool of ChemistrySun Yat-sen UniversityGuangzhouChina

Flame retardants play a crucial role in improving theﬂame retardant properties of polymer *** recent years,environmental problems caused byﬂame retar-dants have attracted widespread *** is urgent to use green and effective methods to prepareﬂame retardant *** nanocomposites with lay-ered structures seem to provide effective ideas,but in general,their hydrophilic raw materials limit their applications in certainﬁ***,we prepared biomimetic composites with a layered“brick-and-mortar”structure by gravity-induced depo-sition using polyimide as the polymer matrix and montmorillonite(MMT)as theﬁ*** well-arranged structures of the composite material could isolate oxygen and prevent combustible gases from *** gas barrier performance has been greatly improved,in which the water vapor transmission rate and the oxygen trans-mission rate decreased by 99.18%and three orders of magnitude,***ﬂame retardant performance has also been improved,and its limiting oxygen index can reach 67.9%.The polyimide matrix can be converted to water-insoluble by ther-mal imidization of water-soluble poly(amic acid)salt precursors,which endows the composites with low *** coating containing MMT can protect against polyurethane(PU)foam fromﬁ*** the conical calorimetric test,the coated sample self-extinguished,and the peak heat release rate,total heat release,and total smoke production are signiﬁcantly decreased by 53.39%,40.69%,and 53.03%,*** advantage of these properties,this work utilizes a facile method to prepare biomimetic composites with low moisture absorption,excellent gas barrier properties,andﬂame retardancy,which have great application potential.

关键词： bioinspired composite ﬁre retardant gas barrier gravity-induced deposition polyimide

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Preparation of Chlorinated Poly(propylene carbonate) and Its Distinguished Properties

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Chinese Journal of Polymer Science 2017年第9期35卷 1086-1096页

作者： Xi-hua Cui Jing Jin Jie Cui 赵桂艳姜伟 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China University of Science and Technology of China Hefei 230026 China

Poly（propylene carbonate）（PPC）, the copolymerization product of carbon dioxide and propylene oxide, was chlorinated for the first time in our laboratory. Nuclear magnetic resonance （NMR） spectroscopy and ion chromatography test showed that chlorine atoms were successfully introduced onto the polymer chains of PPC. We named this newborn polymer material as chlorinated poly（propylene carbonate）（CPPC）. It is worth noting that the reaction conditions of the chlorination of PPC were quite mild, which could be easily and simply realized at industrial level. What is more important is that CPPC possessed many more distinguished properties in solubility, wettability, adhesiveness, and gas barrier compared with PPC. For example, the bonding strength of CPPC as thermal adhesive is nearly four times higher than that of PPC for wood, stainless steel and glass. The oxygen permeability coefficient of CPPC exhibits a decrease of 33% compared with that of PPC. Moreover, CPPC is quite stable in air, whereas it could be well biodegraded in soil compared with PPC. These results indicated that CPPC could be widely used in the fields of coating, adhesive, barrier materials and so on, which could greatly promote the development of PPC industry.

关键词： Poly(propylene carbonate) Chlorination Biodegradability Adhesive gas barrier

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