Preparation and properties of UV⁃resistant poly（propylene carbonate）/acetylated lignin composites

doi:10.19491/j.issn.1001-9278.2024.07.003

Abstract

Abstract:

To improve the compatibility between enzymatic lignin and bio⁃based poly（propylene carbonate）（PPC） and to endow PPC with UV resistance， acetylated lignin （ACEL） was prepared through an acetylation reaction and then was melt blended with PPC to obtain PPC⁃based composites. When 15 wt%（mass fraction， same below） ACEL was incorporated， the composites showed an increase in the yield tensile properties from 10 to 23 MPa， and their elongation at break reached 725 %. Meanwhile， the addition of ACEL also endows PPC with excellent UV resistance. After 96 h UV irradiation， the PPC⁃ACEL⁃15 composites showed retention rates of all above 80 % in the yield strength and elongation at break. These results are significantly better than those of pure PPC and PPC⁃EL⁃15 composites.

Key words: poly（propylene carbonate）, lignin, UV resistance

CLC Number:

TQ323.4

WU Li, XU Pengwu, YANG Weijun, MA Piming. Preparation and properties of UV⁃resistant poly（propylene carbonate）/acetylated lignin composites[J]. China Plastics, 2024, 38(7): 15-19.

Figures/Tables 8

Fig.1. Diagram of preparation process of acetylated lignin

Fig.2. Structure analysis of EL and ACEL

Fig.3. Dispersion of EL and ACEL in PPC matrix

Fig.4. Stress⁃strain curves of PPC， PPC⁃EL and PPC⁃ACEL composites

样品	屈服强度/MPa	断裂伸长率/%
PPC	10.0	947
PPC⁃EL⁃15	14.0	422.5
PPC⁃ACEL⁃10	14.1	840.2
PPC⁃ACEL⁃15	23.0	725.1
PPC⁃ACEL⁃20	22.3	518.9
PPC⁃ACEL⁃30	21.1	381.4

Tab.1. Yield strength and elongation at break of PPC， PPC⁃EL and PPC⁃ACEL composites

Fig.5. SEM of PPC， PPC⁃EL and PPC⁃ACEL composites

Fig.6. UV shielding and UV resistance properties of PPC， PPC⁃EL and PPC⁃ACEL composites

Fig. 7. SEM of PPC， PPC⁃EL and PPC⁃ACEL composites before and after UV irradiation for 96 h

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