167. Hydrogen bonding assisted toughness enhancement of poly(lactide) blended with a bio-based polyamide elastomer of extremely low amounts
writer：Yaqiong Zhang, Jiawei Chen, Qiang Peng, Lingzhi Song, Zhigang Wang,?, Zhongkai Wang,?
keywords：聚乳酸，彈性體，氫鍵，增韌
source：期刊
specific source：Applied Surface Science, 2020, 506, 144684
Issue time：2020年
A sustainable bio-based polyamide copolymer elastomer (PUDA-co-BUDA) was used to blend with polylactide (PLA) for the toughness enhancement purpose. Surprisingly, by adding only 1 wt% PUDA-co-BUDA, the PLA/PUDA-co-BUDA 99/1 blend exhibited a high elongation at break at 195%, which is about 23 times longer than that for neat PLA. By adding PUDA-co-BUDA of extremely low amounts (not exceeding 5 wt%), the elongation at break and tensile toughness values of PLA/PUDA-co-BUDA blends were signifcantly enhanced as compared with that of neat PLA, while certain transparency was kept. The nice aspect was that for these blends the Youngs modulus and yield strength values remained above 1.0 GPa and 50 MPa, respectively. Torque analysis and FTIR spectra demonstrated the absence of reactive reactions during melt blending and the formation of hydrogen bonding between PLA and PUDA-co-BUDA components, respectively. Hydrogen bonding assisted homogeneous dispersion of plenty of PUDA-co-BUDA phase domains with micrometer sizes less than 2.0 μm in the PLA matrix. The sustainable bio-based polyamide copolymer elastomer showed a potential ability to toughen PLA due to hydrogen bonding interaction, which might provide an economical and effective prospect in the biomedical, packaging, and automotive applications for PLA materials.