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정용찬,박언호,최재원,전병철 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.10
The graft polymerization of tert-butyl acrylate (TBA) onto polyurethane (PU) was conducted to prepare a series of samples that was compared to a control series comprising a physical mixture of poly(TBA) and PU. Maximum tensile stress sharply increased because of chemical cross-linking via poly(TBA), whereas tensile breaking strain slightly diminished by the grafted poly(TBA). Percent shape recovery at 10°C rapidly increased by the additional grafting of poly(TBA), whereas control series decreased with increases in TBA monomer content. Chemical cross-linking from the grafted poly(TBA) was responsible for the enhancement of shape recovery. Low-temperature flexibility tests from −35°C demonstrated that a proper composition of grafted poly(TBA) could enhance the flexibility of PU below 0°C. Overall, the grafted poly(TBA) greatly stepped up the maximum tensile stress, recovery capability to original form, and flexibility of PU at very low temperature.