论文部分内容阅读
采用具有“同步增长,同步断撑和原位缩合”特性的超分子构筑调控逐步偶联和聚合方法,合成了高规整的反应性梯形聚乙烯基倍半硅氧烷Vi-LPSQ.该反应性乙烯基可进一步功能化,是制备功能高分子材料的重要前驱体.29Si-NMR是表征梯形聚合物规整性最有效的方法,Vi-LPSQ的重复结构单元共振吸收峰的化学位移δ=-21.6,且峰宽Δca.1,说明其规整性很高.它的XRD谱图上存在两个明显的衍射峰,分别对应于梯形的宽度(d1=0.74 nm)和厚度(d2=0.40 nm),这证实了Vi-LPSQ以典型的梯形结构存在.另外,Vi-LPSQ的玻璃化转变温度Tg高达191.3℃,表明Vi-LPSQ分子具有很高的刚性和规整性.
High-regioselective reactive trapezoidal polyvinylsilsesquioxane Vi-LPSQ was synthesized by a step-by-step coupling and polymerization approach with supramolecular regrowth with “synchronous growth, simultaneous breaking and in situ condensation” Reactive vinyl can be further functionalized, which is an important precursor for the preparation of functional polymers.29Si-NMR is the most effective method to characterize the regularity of ladder polymers. The chemical shift of the resonance absorption peak of Vi-LPSQ is δ = -21.6, and the peak width Δca.1, indicating that its regularity is very high.It has two obvious diffraction peaks on the XRD spectrum, corresponding to the width of the trapezoid (d1 = 0.74 nm) and the thickness (d2 = 0.40 nm ), Which confirmed that Vi-LPSQ exists in a typical ladder structure.In addition, the glass transition temperature Tg of Vi-LPSQ is as high as 191.3 ℃, indicating that Vi-LPSQ has high rigidity and regularity.