Journal
POLYMER INTERNATIONAL
Volume 62, Issue 6, Pages 966-973Publisher
WILEY-BLACKWELL
DOI: 10.1002/pi.4384
Keywords
Covalent functionalization; free radical; benzoxazine; graphene; nanocomposite; coefficient of thermal expansion
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Funding
- Cross-Strait Tsing Hua Research Program of the National Tsing Hua University, Taiwan [101N2707E1]
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We describe the preparation of vinyl-terminated benzoxazine-functionalized graphene using free radical grafting. The resulting functionalized graphene (f-graphene) was incorporated into bis(3-allyl-3,4-dihydro-2H-1,3-benzoxazinyl)methane (V-BF-a) monomer in order that nanocomposites could be prepared. Results of scanning electron microscopy and transmission electron microscopy revealed that the sheets of f-graphene were well dispersed throughout the matrix, and there was a strong interfacial interaction between the f-graphene and polyV-BF-a. The inclusion of f-graphene into the nanocomposites resulted in a material with a high thermal stability and a low coefficient of thermal expansion (CTE); increasing the content of f-graphene reduced the CTE significantly more. A reduction in the CTE of up to 48% was produced by adding just 1 wt% of f-graphene; this corresponded to an increase of 12 degrees C in the glass transition temperature. These results suggest that f-graphene nanocomposites can be tuned' to give materials with both a low CTE and a high thermal stability, and that graphene composites of this type can thus be manufactured to withstand a wider range of temperatures.
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