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- W2009728810 abstract "Little consideration has until now been given to the effect of microphase separation in crosslinked polymers. This work deals with the correlation between the network chain length and some bulk properties of a series of seven highly crosslinked polymers prepared from dimethylsiloxane diacrylate oligomers with different lengths between their acrylic terminal groups. The occurrence of multiple transitions in the shear modulus versus temperature behavior, probably due to microphase separation, and the dependence of the transition regions and shear moduli on the siloxane network chain length were studied. The findings are compared with those of a similar work reported by us earlier, in which carboxyl-terminated poly(dimethylsiloxanes) of similar chain lengths of the prepolymers were condensed with a trifunctional imine and yielded polymers exhibiting multiple transitions.Multiple transitions were observed in some of the crosslinked polymers, but this phenomenon disappeared with an increase in the amount of siloxane groups in the prepolymers. It seems that the reason for this suppression of microphase separation, as compared with the crosslinked carboxyl-terminated oligosiloxanes, derives from the absence of sufficiently long organic sequences, from their limited number in the network chains, and from internal plasticization by the side chains formed as a result of inefficient crosslinking. The nature of the crosslinking site and the mechanism of crosslinking have a decisive influence on the structure and properties of the polymers including the occurrence of multiple transitions, even when the prepolymers are almost identical between their functional end groups." @default.
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- W2009728810 date "1974-01-01" @default.
- W2009728810 modified "2023-09-27" @default.
- W2009728810 title "Correlation between molecular structure and some bulk properties of highly crosslinked polysiloxanes" @default.
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- W2009728810 doi "https://doi.org/10.1002/polc.5070460112" @default.
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