Preparation and characterization of stable DQ silicone polymer sols
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Stable DQ silicone polymer sols composed of di (D)- and tetra (Q)-functional alkoxysilanes were prepared by the following methods: (i) co-hydrolysis–condensation between diethoxy(dimethyl)silane (DEDMS) and tetraethoxysilane (TEOS) (DEDMS–TEOS as random copolymer sols), (ii) co-hydrolysis–condensation between poly(dimethylsiloxane) (PDMS) and TEOS (PDMS–TEOS as random block copolymer sol), and (iii) triethoxysilylation of a PDMS-lithium salt (PDMS–TES). The polymer sols were characterized by GPC, NMR, and FT-IR. The differences in properties between the structures were analyzed from their thermal stabilities and by using the swelling test. Thermal stabilities of these polymer sols were increased with the increase in the chain length of the D domain and with decrease in hydrolyzability. The swelling of films via polymer sols was decreased with the increase in the degree of crosslinking in sols.
DQ silicone sols with different content and length of D units were prepared by using two methods.
Triethoxysiloxyl-terminated PDMS of higher molecular weight was prepared.
The structures of these polymer sols were characterized by 29Si NMR spectra.
The differences in properties of the structures were evaluated from their thermal stabilities and by using the swelling test.
KeywordsDQ silicone polymers NMR spectra Sols Sol–gel reaction
This work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas “New Polymeric Materials Based on Element-Blocks” (No. 2401) (JSPS KAKENHI Grant Number JP24102008). This work was also supported by JSPS KAKENHI Grant Number JP16K17951.
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Conflict of interest
The authors declare that they have no conflict of interest.
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