Choi, Seung-Sock Lee, Albert S. Hwang, Seung Sang Baek, Kyung-Youl 2024-01-20T06:04:02Z 2024-01-20T06:04:02Z 2021-09-05 2015-09-08 0024-9297 https://pubs.kist.re.kr/handle/201004/125027 Through fine-tuning of the myriad of reaction conditions for an aqueous base-catalyzed hydrolysis-polycondensation reaction, a facile synthesis of structurally controlled polyphenylsilsesquioxanes was developed. Mechanism and kinetic studies indicated that the condensation reaction proceeded through a T-1 structured dimer, which was quantitatively and in situ formed through mild hydrolysis of a phenyltrimethoxysilane (PTMS) monomer, to give either the cage-structured polyhedral oligomeric silsesquioxanes (POSS) or the corresponding ladderlike silsesquioxane (LPSQ) with excellent yields. Ladderlike and FOSS materials were selectively achieved at higher and lower initial concentrations of PTMS, respectively, and an in-depth spectroscopic analysis of both compounds clearly revealed their structural differences with different molecular weights. English AMER CHEMICAL SOC SILSESQUIOXANES HYDROLYSIS SCATTERING KINETICS POSS MECHANISM Structural Control of Fully Condensed Polysilsesquioxanes: Ladderlike vs Cage Structured Polyphenylsilsesquioxanes Article 10.1021/acs.macromol.5b01539 1 MACROMOLECULES, v.48, no.17, pp.6063 - 6070 MACROMOLECULES 48 17 6063 6070 scie scopus 000361253700003 2-s2.0-84941027516 Polymer Science Polymer Science Article SILSESQUIOXANES HYDROLYSIS SCATTERING KINETICS POSS MECHANISM