梯形聚硅氧烷的研究进展

Research Progress of the Ladder Polysiloxanes(R-LPS)

梯形聚硅氧烷(R-LPS)因其独特的双链或多重链结构而具有较单链聚硅氧烷更高的耐热、耐氧化、耐辐射性以及良好的生物稳定性。自从上世纪60年代R-LPS首次被报道以来,一直受到广泛的关注。随着人们对分子间弱相互作用认识的加深,对R-LPS的形成机理、制备方法和性能的研究,都有进一步的发展,并涉及超分子自组装、化学合成、纳米结构及性能表征等许多高分子科学的前沿问题。本文根据近五年来采用"超分子构筑调控逐步偶联和聚合"方法合成的新型双链、三重链及四重链梯形聚硅氧烷及其性能进行了综述,其中包括具有不同侧基的R-LPS的合成与表征。

Due to the unique double-or multiple-chain structure,Ladder-like polysiloxanes(R-LPSs)have shown much higher resistance to heat,oxidation and radiation than the corresponding single-chain polysiloxanes.Since the first report in1960 sby Brown,R-LPS has attracted a lot of attention worldwidely,and great efforts have been made in synthesis novel RLPS and enhance the regularity of the ladder structures since then.With the deepening understanding of the no chemical bonded inter-molecular interaction,the synthesis mechanism of R-LPS has also been further developed.It involves broad theoretical and experimental research in polymer frontiers,such as supramolecular assistant synthesis method,ladder macromolecular formation mechanism,nanostructure and material properties characterization,etc.This paper first gives an overall introduction of R-LPSs,and then reviews the most recent progress in this field.Especially,this paper reviews the publications on the synthesis of R-LPS based on the'super-molecular coupling and the gradually build-up polymerization'.The R-LPSs in this review are generally classified based on structure of the main chain as three categories:Radical-sided double-chain-bonded ladder polysiloxane(R-DLPS),Radical-sided triple-chain-bonded organo-bridged ladder polysiloxane(R-TLPS)and Radical-sided quadruple-chain-bonded ladder polysiloxane(R-QLPS).Synthesis and characterization of RLPSs with different side groups are demonstrated.The cited papers are mostly published in the nearest five years.