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Thermosetting resins from a tetra‐functional vinylbenzene compound possessing cyclic siloxane cores
Author(s) -
Lee HsuanWei,
Chang LiMing,
Liu YingLing
Publication year - 2021
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20210380
Subject(s) - siloxane , thermosetting polymer , materials science , hydrosilylation , thermal stability , polymer chemistry , silsesquioxane , monomer , glass transition , polymer , chemical engineering , composite material , organic chemistry , chemistry , engineering , catalysis
Cyclic siloxane is an attractive building block for incorporation of silicon‐containing units as well as their distinguished properties to polymer materials. This work reports the synthesis and characterization of a tetra‐functional vinylbenzene compound possessing cyclic siloxane cores (cD 4 ‐4VB). Synthesis of cD 4 ‐4VB is carried out using cD 4 ‐4SiH as the reactive precursor and multiple‐step reactions, including hydrosilylation, deacetylation, and S N 2 substitution. cD 4 ‐4VB is an effective monomer for preparation of the corresponding cyclic silicon‐based thermosetting resins (CR‐cD 4 ‐4VB). CR‐cD 4 ‐4VB shows attractive film formability and good thermo‐mechanical properties, including a storage modulus of 2.0 GPa, a glass transition temperature of 282°C, a thermal stability above 400°C, a high char yield (at 800°C in nitrogen) of 55 wt%, and a dielectric constant of 3.12 at 10 GHz. This kind of resins have potential of application for halogen‐free flame retardants and high‐performance polymer films.