TY - GEN
T1 - Injection molding of novel polylactic acid/thermoplastic polyurethane (PLA/TPU) blends with shape-memory behavior
AU - Jing, Xin
AU - Mi, Hao Yang
AU - Turng, Lih Sheng
AU - Peng, Xiang Fang
PY - 2013
Y1 - 2013
N2 - This paper presents the development of shape-memory polymers (SMPs) based on amorphous polylactic acid (PLA) and thermoplastic polyurethane (TPU) blends. PLA was melt blended with TPU at weight ratios of 20, 30, and 40%, and then injection molded and hot compressed into permanent shapes. Unlike most of the existing SMPs, all three PLA/TPU blends could be formed (via bending, folding, compression, stretching, etc.) into temporary shapes at room temperature without an extra heating step. Upon heating to above the glass transition temperature of PLA (at 70 °C), the deformed parts regained their original shapes fairly quickly. Differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) tests showed that PLA and TPU were immiscible. The dynamic mechanical analyzer (DMA) data and the mechanical tests, including tensile, compression, and flexural tests, showed that the PLA/TPU with the 80/20 weight ratio had the best shape-memory properties, even if it was somewhat brittle. The 70/30 PLA/TPU blend had the best combination of shape recovery and mechanical properties. The shape memory mechanisms for these types of SMPs are discussed here in detail.
AB - This paper presents the development of shape-memory polymers (SMPs) based on amorphous polylactic acid (PLA) and thermoplastic polyurethane (TPU) blends. PLA was melt blended with TPU at weight ratios of 20, 30, and 40%, and then injection molded and hot compressed into permanent shapes. Unlike most of the existing SMPs, all three PLA/TPU blends could be formed (via bending, folding, compression, stretching, etc.) into temporary shapes at room temperature without an extra heating step. Upon heating to above the glass transition temperature of PLA (at 70 °C), the deformed parts regained their original shapes fairly quickly. Differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) tests showed that PLA and TPU were immiscible. The dynamic mechanical analyzer (DMA) data and the mechanical tests, including tensile, compression, and flexural tests, showed that the PLA/TPU with the 80/20 weight ratio had the best shape-memory properties, even if it was somewhat brittle. The 70/30 PLA/TPU blend had the best combination of shape recovery and mechanical properties. The shape memory mechanisms for these types of SMPs are discussed here in detail.
UR - http://www.scopus.com/inward/record.url?scp=84903511619&partnerID=8YFLogxK
M3 - 会议稿件
AN - SCOPUS:84903511619
SN - 9781632665300
T3 - Annual Technical Conference - ANTEC, Conference Proceedings
SP - 944
EP - 948
BT - 71st Annual Technical Conference of the Society of Plastics Engineers 2013, ANTEC 2013
PB - Society of Plastics Engineers
T2 - 71st Annual Technical Conference of the Society of Plastics Engineers 2013, ANTEC 2013
Y2 - 22 April 2013 through 24 April 2013
ER -