Preparation and Properties of Hypromellose⁃toughened Poly（lactic acid） Composites

doi:10.19491/j.issn.1001-9278.2021.05.010

Abstract

Abstract:

Hypromellose （HMC） was used as an impact modifier to prepare Poly（lactic acid）（PLA）/HMC composites by melt blending. The rheological， mechanical and crystallization properties of the composites were analyzed systematically. The results indicated that the composites exhibited a decrease in apparent viscosity with increasing shear rate， temperature and HMC content. HMC were uniformly dispersed in the PLA matrix due to good compatibility between PLA and HMC. The composites achieved the maximum elongation at break and impact strength at an HMC content of 10 wt%， indicating a good toughening effect on PLA. However， their tensile strength decreased gradually with an increase in the content of HMC. HMC could reduce the crystalline properties of the composites， resulting in a gradually decrease in their melting points and crystallinity with an increase in the content of HMC.

Key words: poly（lactic acid）, hypromellose, toughening, rheology, crystallization

CLC Number:

TQ321

XU Jiayi. Preparation and Properties of Hypromellose⁃toughened Poly（lactic acid） Composites[J]. China Plastics, 2021, 35(5): 59-64.

Figures/Tables 9

Fig.1. The rheological curves of PLA/HMC composites melts with different HMC content

Fig.2. The apparent viscosity versus shear rate curves of PLA/HMC composites at different temperature

Fig.3. Stress?strain curves of PLA/HMC composites with different HMC content

Fig.4. Tensile strength and elongation at break of PLA/HMC composites with different HMC content

Fig.5. Effect of HMC content on impact strength of PLA/HMC composites

Fig.6. XRD spectra of PLA/HMC composites with different HMC content

Fig.7. DSC heating curves of PLA/HMC composites with different HMC content

HMC含量/%	ΔH/J·g^-1	X_c/%
0	20.83	22.26
5	18.74	20.03
10	17.28	18.46
15	14.47	18.18
20	13.22	17.66

Tab.1. Relative crystallinity of PLA/HMC composites with different HMC content

Fig.8. SEM of PLA/HMC composites with different HMC content

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