Tensile and responsive shape-memory properties of linear and radial styrene-butadiene-styrene (SBS) blended with poly(lactic acid) (PLA)
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Date
2019-07
Authors
Abdul Aziz Bin Saleh
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Abstract
In this study, the effect of different styrene-butadiene-styrene(SBS) architectures (linear (L-SBS) and radial (R-SBS)) and compositions of SBS and Polylactic acid (PLA) on shape memory properties were investigated. Various compositions of the blends were prepared by internal mixer and then were compression moulded to the desired shape. The shape memory testing was carried out by pre-deforming of a rectangular shape sample at different pre-deformed temperature, Td (55, 65 and 80°C) for 5 minutes and then the sample was exposed to fixing temperature, Tf (30°C) for about 10 minutes before the sample heated again at recovery temperature, Tr (55, 65 and 80°C). Both of the blends showed good shape memory properties when the PLA became continuous phase with PLA/L-SBS blend exhibited higher shape memory properties that did not change much with variation of deformation and recovery temperature. The blend with 70 wt% PLA showed higher shape recovery properties compared to other compositions. Meanwhile, PLA/L-SBS blends indicated higher variation of glass tansition temperature (Tg) of PLA and polybutadiene component with compositions compared with PLA/R-SBS might be due to higher interphase interaction between PLA and SBS in PLA/L-SBS blend. In addition, tensile strength of both of the blends system increased with increasing PLA with higher values in PLA/L-SBS than PLA/R-SBS might be due to higher formation of physical crosslinking in the PLA/LSBS.