Toughening modification of PHBV with EVA elastomer

doi:10.19491/j.issn.1001-9278.2022.12.003

Abstract

Abstract:

A series of poly（3⁃hydroxybutyrate co⁃3⁃hydroxyvalerate）（PHBV）/ ethylene vinyl acetate elastomer （EVA） blends were prepared by melt blending using EVA as an impact modifier， and their structure and properties were characterized using Fourier⁃transform infrared spectrometer， torque rheometer， differential scanning calorimeter， thermogravimetric analyzer， mechanical property test， and hot table polarizing microscope. The results indicated that the compatibility and dispersion of PHBV and EVA were enhanced through the hydrogen bonding， entanglement， and similar backbone structure between two polymers. With a gradual increase in the content of EVA， the crystallinity of PHBV/EVA blends increased at first and then tended to decrease at the EVA content less than 10 wt%. Meanwhile， the number of PHBV spherules increased but their size decreased gradually. Compared to pure PHBV， the PHBV/EVA blends with a EVA content of 30 wt % obtained an increase in elongation at break and impact strength by 87.8 % and 338.4 % respectively.

Key words: poly （3?hydroxybutyrate?co?3?hydroxyvalerate）, ethylene?vinyl acetate elastomer, toughening, modification

CLC Number:

TQ 321

HUANG Jiawei, HAN Xiaolong, WU You, JIN Yujuan, GUO Maolin. Toughening modification of PHBV with EVA elastomer[J]. China Plastics, 2022, 36(12): 16-23.

Figures/Tables 8

样品编号	PHBV/%	EVA/%
1^#	100	0
2^#	95	5
3^#	90	10
4^#	85	15
5^#	80	20
6^#	75	25
7^#	70	30

Tab.1. Ratio of PHBV/EVA composites

Fig.1. FTIR analysis of PHBV，EVA and PHBV/EVA composites（a）， the hydrogen bond fraction （FH⁃CO） and peak deconvolution for the nanocomposites with 20 wt % EVA （inset）（b） and schematic diagram of hydrogen bonding （c）

Fig.2. Rheological properties of PHBV and PHBV/EVA composites

Fig.3. Polarization diagram of PHBV and PHBV/EVA composites

Fig.4. Mechanical properties of PHBV and PHBV/EVA composites

Fig.5. Thermal performances and Et of PHBV and PHBV/EVA composites

EVA 含量/%	T_c/℃	ΔH_c/ J·g^-1	T_m/℃	ΔH_m/ J·g^-1	X_c/%	T₀/℃
纯PHBV	106.4	71.3	172.3	80.1	54.9	281.0
5	107.1	75.6	168.1	94.4	61.4	277.5
10	107.9	87.1	168.1	109.4	67.4	286.9
15	106.4	80.5	167.7	106.7	62.1	277.6
20	107.8	85.9	168.2	108.0	59.2	290.8
25	106.7	75.9	168.0	97.4	50.0	281.3
30	105.2	64.0	167.7	80.8	38.7	287.8

Tab.2. Tc，ΔHc，Tm，ΔHm， Xc and T0 of PHBV and PHBV/EVA composites

Fig.6. SEM image of PHBV and PHBV/EVA composites

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