Improving the ceramic yield of polycarbosilane by radiation cross-linking in the presence of multifunctional monomers
作者：Lulu Zhou Yong Cheng Wenfa Zhang Wenli Zhang Weihua Liu Yunbo Li Mouhua Wang
關(guān)鍵字：polycarbosilane, irradiation
論文來源：期刊
具體來源：International Journal of Applied Ceramic Technology
發(fā)表時(shí)間：2018年
An
interesting method for radiation cross‐linking polycarbosilane (PCS) at
high efficiency and low cost was developed by adding multifunctional
monomers (trimethylolpropane trimethacrylate (TMPTMA) or divinylbenzene
(DVB)). The effect of multifunctional monomers on the radiation
cross‐linking and ceramic yield of PCS was investigated. The results
revealed that the addition of a small amount of multifunctional monomer
can substantially improve the ceramic yield and reduce the absorbed dose
by promoting cross‐linking. The ceramic yields of radiation
cross‐linked “PCS/2%DVB (300 kGy)” and “PCS/2%TMPTMA (300 kGy)” were 74
wt% and 78 wt%, respectively, while that of the radiation cross‐linked
“PCS (300 kGy)” was only 64 wt%. The presence of double bonds in
multifunctional monomers stimulates the combination reactions of free
radicals in PCS induced by γ‐ray irradiation and subsequently enhances
the efficiency of cross‐linking. Furthermore, it was found that the
incorporation of a small amount of multifunctional monomer hardly
affected the chemical composition and crystallization behavior of the
final SiC ceramics.
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