Cellulose acetate/poly(methyl methacrylate) interpenetrating networks: synthesis and estimation of thermal and mechanical properties |
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Authors: | Dan Aoki Yoshikuni Teramoto Yoshiyuki Nishio |
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Institution: | (1) Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan; |
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Abstract: | IPN-type composites consisting of cellulose acetate (CA) and poly(methyl methacrylate; PMMA) were successfully synthesized
in film form. In this synthesis, a mercapto group (SH)-containing CA, CA-MA, was prepared in advance by esterification of
CA with mercaptoacetic acid, and then intercomponent cross-linking between CA-MA and PMMA was attained by thiol–ene polymerization
of methyl methacrylate (MMA) onto the CA-MA substrate. For comparison, polymer synthesis was also attempted to produce a semi-IPN
type of composites comprising CA and cross-linked PMMA, via copolymerization of MMA and ethylene glycol dimethacrylate as
cross-linker in a homogeneous system containing CA solute. Thermal and mechanical properties of thus obtained polymer composites
were investigated by differential scanning calorimetry, dynamic mechanical analysis, and a tensile test, in correlation with
the mixing state of the essentially immiscible cellulosic and methacrylate polymer components. It was shown that the specific
IPN technique using thiol–ene reactions usually resulted in a much better compatibility-enhanced polymer composite, which
exhibited a higher tensile strength and even an outstanding ductility without parallel in any film sample of CA, PMMA, and
their physical blends. |
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Keywords: | |
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