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评估交联密度对聚乙烯网络的双向形态逆向记忆的影响
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| The “two-way” shape memory effect consists in a cyclic elongation-contraction effect, achieved by subjecting semicrystalline networks a constant load and to a coolingheating cycle from above melting temperature (Tm) to below crystallization temperature (Tc ). The achievable elongations and the transformation temperatures may be tailored by varying the material network density. In this work we have explored the two-way shape memory response of poly (ε-caprolactone)-based networks presenting a large variation in crosslink density. A significant strain increment observed during cooling and is almost completely reversed by heating above Tm. By representing strain as a function of temperature it is possible to identify two different contributions to the overall elongation, one due to a rubber entropy process and the other due to a crystallization induced effect. These two processes have different importance on the materials response. Maximum elongation could be achieved by improving the balance between materials compliance and the resistance to applied stress. |
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2017-02-24 16:33:40, 358.79 K
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