Thermal behavior of dry native starch, amylose and amylopectin originating from different plants was investigated using Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC). The decomposition temperature increased as the molecular weight increased and a sudden increase was observed at a molecular weight of 50,000 that can be the critical value. DSC analyses verified that the amorphous phase in the specimens was swollen by bound water within a temperature range of 323–428 K. The change in swelling enthalpy divided by the peak temperature of swelling depended linearly on the volume fraction of bound water, regardless of the origin and the composition or purity of the specimens. Furthermore, bound water depressed the melting points of crystallites in the specimens, which agreed well with the prediction of Flory's lattice theory.
Abstract. Based on the research of crashworthiness of advanced composites, PAM-Crash simulation software was utilized to predict the crash behavior of thermoset matrix and thermoplastic matrix. The simulation results demonstrated that the thermoset matrix and thermoplastic matrix showed an ideal fragment collapse mode, with a SEA of 63.3 kJ/kg and 50.9 kJ/kg, respectively. Both the SEA values are higher than Aluminum alloy, 17.32 kJ/kg, which means both material systems are promising to replace metal as energy absorption structure in transport applications.
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