A review with 90 references covering methods used to prepare polyphenylsilsesquioxanes (PPSQ) and ladder-structured polymethylsilses-quioxanes (PMSQ) (formula I), viz., (i) three- or two-step hydrolytic poly-condensations of trifunctional silanes RSiX_3 (R = alkyl, aryl; X = Cl, OR', OAc); (ii) stepwise coupling polymerization of RSiX_3; (iii) polymerization of polyhedral silsesquioxanes. Methods to prepare insoluble globular spherical PMSQ and bridged polysilsesquioxanes (formulas III and IV) are also reviewed. Evidence is adduced for the ladder structure of polysilsesquioxanes (formulas V and VI; Table 1). Selected physicochemical property data and thermal stability data are given. Principal polysilsesquioxane application trends are characterized .
展开▼
机译：有90篇参考文献进行了综述，涵盖了用于制备聚苯基硅倍半氧烷（PPSQ）和梯形结构聚甲基硅倍半氧烷（PMSQ）（式I）的方法，即（i）三官能硅烷RSiX_3的三步或两步水解缩聚反应（ R =烷基，芳基; X = Cl，OR'，OAc）; （ii）RSiX_3的逐步偶联聚合; （iii）多面体倍半硅氧烷的聚合。还综述了制备不溶性球状球形PMSQ和桥联的倍半硅氧烷（式III和IV）的方法。有证据表明聚倍半硅氧烷的阶梯结构（式V和VI;表1）。给出了选定的理化性质数据和热稳定性数据。表征了主要倍半硅氧烷的应用趋势。
展开▼
