Ladder Polysiloxanes

Recent progress in ladder-like polysilsesquioxane: synthesis and applications

“…74 On the other hand, ladder-like polysilsesquioxane (LPSQ) possesses a double-stranded polymeric 1-dimensional network structure, offering stability comparable to that of POSS, along with superior solubility. [75][76][77] The LPSQ structure was first reported in 1960 by Brown et al, who synthesized high molecular weight polyphenylsilsesquioxane through the basecatalyzed polymerization of the hydrolysis products of phenyltrichlorosilane. [78][79][80] They used X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectroscopy to confirm that the synthesized material had a double-stranded cissyndiotactic conformation, distinct from POSS.…”

“…The stability of LPSQ primarily stems from the thermal/chemical robustness as well as the oxidative resistance of its inorganic (siloxane) backbone. The rigidity of its double-stranded structure contributes to superior mechanical properties, 76 effectively blending the benefits of inorganic materials with the versatility of organic components. 13,[170][171][172][173] It possesses a high decomposition temperature (T d ) and glass transition temperature (T g ) compared to other organic compounds.…”