A series of semi‐interpenetrating polymer networks (semi‐IPN) based on linear poly(vinyl chloride‐co‐vinyl acetate) and cross‐linked poly(butyl acrylate) were synthesized. The copolymer was swelled in butyl acrylate monomer containing azobisisobutyronitrile (AIBN) initiator and tetraethylene glycol dimethacrylate cross‐linker and later polymerized in situ. Variation in composition of the IPN was achieved by varying the copolymer/monomer ratio. The semi‐IPN was found to exhibit two distinct glass transitions as measured by differential scanning calorimetry and dynamic mechanical analysis. The tan θ values were found to be dependent on the composition. The tensile strength was found to be higher for semi‐IPNs containing a higher percentage of copolymer.
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Mathew et al. (1992) studied this question.
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