From Amorphous Silicones to Si-Containing Highly Ordered Polymers: Some Romanian Contributions in the Field.

ABSTRACT: Polydimethylsiloxane (PDMS), in spite of its well-defined helical structure, is an amorphous fluid even at extremely high molecular weights. The cause of this behavior is the high flexibility of the siloxane backbone and the lack of intermolecular interactions attributed to the presence of methyl groups. These make PDMS incompatible with almost any organic or inorganic component leading to phase separation in siloxane-siloxane copolymers containing blocks with polar organic groups and in siloxane-organic copolymers, where dimethylsiloxane segments co-exist with organic ones. Self-assembly at the micro- or nanometric scale is common in certain mixed structures, including micelles, vesicles, et cetera, manifesting reversibly in response to an external stimulus. Polymers with a very high degr

SUBMITTER: Cazacu M 

PROVIDER: S-EPMC8157024 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature