31 March 2009 Influence of radiation dose on shape memory effect of styrene copolymer
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This paper is concerned about the influence of radialization dosage on performance of shape memory styrene copolymer. In this paper, the glass transition temperature (Tg) of styrene copolymer was measured by Dynamic Mechanical Analysis (DMA). The shape memory performance of styrene copolymer before and after radiation was also evaluated. Results indicated, the gel content of radiated styrene copolymer decreased by 14.3%, tensile strength reduced by 16.7% and slightly increase in elongation break. The storage modulus decrease sharply and the range of glass transition become narrower; the loss modulus reduces. In radiated styrene copolymer was not new peaks and the just height of the previous peaks varies in the spectra. It indicates, there are no oxidized reaction in the process of radiation. The shape recovery is conducted at different temperature for the SMP and radiated SMP. Below 85°C, the recovery speed of radiated SMP is faster than that of SMP without radiation. Above 85°C, the recovery speed of SMP is faster than that of radiated SMP. It can be explained as: after the radiation, the degradation of the polymer occurs, the chain of the molecule become shorter, the Tg decreases, and the storage modulus reduces consequently.
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Dawei Zhang, Dawei Zhang, Yanju Liu, Yanju Liu, Jinsong Leng, Jinsong Leng, } "Influence of radiation dose on shape memory effect of styrene copolymer", Proc. SPIE 7289, Behavior and Mechanics of Multifunctional Materials and Composites 2009, 728911 (31 March 2009); doi: 10.1117/12.815696; https://doi.org/10.1117/12.815696

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