Toughening modification of poly （3⁃hydroxybutyrate⁃co⁃3⁃hydroxyvalerate） by bio⁃based engineering polyester elastomer

doi:10.19491/j.issn.1001-9278.2022.09.004

Abstract

Abstract:

In this paper， the properties of poly（3⁃hydroxybutyrate⁃co⁃3⁃hydroxyvalerate） PHBV/bio⁃based engineering polyester elastomer （BEPE） compounds were studied through analyzing their rheological properties， crystallization properties， mechanical properties， thermal properties， and microstructure. The results indicated that the number of PHBV spherulites increased along with a decrease in their size due to the hydrogen bonding， chain entanglement， and similar main chain structures between PHBV and BEPE， resulting in better compatibility and dispersion. When 30 wt% BEPE was added， the compounds achieved maximum elongation at break and impact strength， increasing by 589.2 % and 149.4 %， respectively， compared to pure PHBV. The crystallinity of the compounds decreased with the addition of BEPE， and their impact fracture surface tended to be rough along with a “brittle⁃ductile” transition according to the morphological observation.

Key words: poly（3?hydroxybutyrate?co?3?hydroxyvalerate）, bio?based engineering polyester elastomer, toughening, compatibilization, crystallization, brittle?ductile transition

CLC Number:

TQ323.4

HUANG Jiawei, HAN Xiaolong, WU You, JIN Yujuan, WANG Zhao. Toughening modification of poly （3⁃hydroxybutyrate⁃co⁃3⁃hydroxyvalerate） by bio⁃based engineering polyester elastomer[J]. China Plastics, 2022, 36(9): 24-31.

Figures/Tables 9

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

Tab.1. PHBV/BEPE blend formula

Fig.1. 1H⁃NMR spectrum of the BEPE

Fig.2. FTIR analysis of PHBV，BEPE and PHBV/BEPE blends and carbonyl stretching region （νc=o） in the infrared spectra，the hydrogen bond fraction （FH⁃CO） and schematic diagram of hydrogen bonding

Fig.3. Analysis of PHBV and PHBV/BEPE blends

Fig.4. PLM diagram of PHBV and PHBV/BEPE blends

Fig.5. Mechanical properties of PHBV and PHBV/BEPE blends

Fig.6. Thermal performance of PHBV and PHBV/BEPE blends

BEPE 含量/%	T_c/℃	ΔH_c/ J·g^-1	T_m/℃	ΔH_m/ J·g^-1	X_c/%	T₀/℃
0	106.4	71.3	172.3	80.1	54.9	265.5
5	112.8	91.8	169.0	114.6	74.6	270.7
10	114.1	80.7	168.8	99.1	61.1	258.0
15	112.6	78.0	170.3	94.0	54.7	265.5
20	112.6	67.9	170.5	82.7	45.3	264.2
25	113.8	66.4	169.0	83.2	42.7	271.6
30	112.5	65.2	169.4	80.5	38.6	269.7

Tab.2. Crystallinity of PHBV and PHBV/BEPE blends

Fig.7. SEM image of the impact section of PHBV and PHBV/BEPE blend

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