The effect of the polydimethylsiloxane chain length on the properties of four-arm siloxane stars

Авторы: Dyuzhikova Yulia S., Anisimov Anton A., Gorodov Vadim V., E A.Olenich, Buzin Mikhail I., Nikiforova Galina G., Kostrov Sergey A., Shchegolikhina Olga I., Muzafarov Aziz M.
Журнал: Journal of Organometallic Chemistry
Год издания: 2023
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 122650
DOI: 10.1016/j.jorganchem.2023.122650
Аннотация: Five low-dispersity star-shaped polydimethylsiloxanes were synthesized. The macromolecules of thepolymers contain the same branching-out center, a cis-tetraphenylcyclotetrasilsesquioxane moiety, and thesame number of arms, but with different lengths (n = 15, 21, 48, 75, and 123 Si(Me)2O units). Theirproperties were studied by a set of physicochemical analytical methods. Viscometric studies showed thatthe macromolecules of the Ph4-15, Ph4-21, Ph4-48, and Ph4-75 polymers are small-sized dense balls both insolution and in melt. DSC studies identified an unusual effect of the cyclic core on the thermal behavior ofthe Ph4-15, Ph4-21, and Ph4-48 polymers. Its incorporation suppresses the crystallization of PDMS-arms(up to n = 48 Si(Me)2O units) at concentrations four times lower than those of known modifiers and doesnot affect the glass transition temperature (ca. -124С).
Добавил в систему: Городов Вадим Валерьевич

	ИСТИНА	Войти в систему Регистрация
	ИСТИНА ИНХС РАН
	Главная Поиск Статистика О проекте Помощь

ИСТИНА