Modification of PHBV/EVA Blends with OMMT

doi:10.19491/j.issn.1001-9278.2021.10.011

Abstract

Abstract:

Poly（3-hydroxybutyrate-co-3-hydroxyvalerate）（PHBV）/ethylene-vinyl acetate elastomer （EVA）/organically modified montmorillonite （OMMT） blends were prepared through melting blending using OMMT as a modifier. Their rheological， crystalline， mechanical， and thermal properties as well as morphology were characterized using a rotational rheometer， differential scanning calorimeter， infrared spectrometer， universal testing machine， thermal weight loss analyzer， polarized light microscope and scanning electron microscope. The results indicated that the blends achieved an increase in loss modulus and complex viscosity with an increase in the OMMT content. OMMT can induce an intercalation structure in the blends. The addition of OMMT deteriorated the crystallization of the blends， resulting in a decrease in crystallinity. The blends exhibited the lowest degree of crystallinity of 43.4 % at an OMMT content of 7 phr. Their elongation at break and impact strength increased at first and then decreased with an increase in the OMMT content. Compared to the PHBV/EVA binary blends， the ternary blends with 3 phr of OMMT achieved an increase in elongation at break by 38.3 % and in impact strength by 52.5 %. Their impact facture surface became rougher with the addition of OMMT.

Key words: poly（3-hydroxybutyrate-co-3-hydroxyvalerate）, ethylene-vinyl acetate elastomer, organically modified montmorillonite, modification

CLC Number:

TQ327.8

TIE Rui, WU You, HAN Xiaolong, SONG Jiajie, WANG Yuchen, KAN Chunyi, YUAN Mengju, JIN Yujuan. Modification of PHBV/EVA Blends with OMMT[J]. China Plastics, 2021, 35(10): 60-67.

Figures/Tables 10

Fig.1. FTIR spectrum of PHBV/EVA/OMMT blends

OMMT含量/份	凝胶含量/%
0	0.77
1	4.65
3	6.94
5	5.80
7	3.86

Tab.1. Gel content of PHBV/EVA/OMMT blends

Fig.2. Rheological properties of PHBV/EVA/OMMT blends

Fig.3. PLM images of PHBV/EVA/OMMT blends

Fig.4. XRD spectrum of PHBV/EVA/OMMT blends

OMMT含量/份	2θ/（°）	晶面间距/?
100	4.0	22.1
100	7.9	11.1
1	3.7	23.7
1	5.5	16.1
3	2.7	33.2
3	5.5	16.1
5	2.3	38.1
7	2.4	36.2

Tab.2. Crystallization behaviour of PHBV/EVA/OMMT blends from XRD spectrum

Fig.5. Thermal performance of PHBV/EVA/OMMT blends with different OMMT content

OMMT含量/份	结晶温度/℃	结晶焓/J·g^-1	熔融温度/℃	熔融焓/J·g^-1	结晶度/ %	初始分解温度/℃
0	107.8	85.9	168.2	108.0	59.2	290.8
1	103.9	72.3	166.9	92.7	50.8	278.0
3	104.6	67.2	166.7	85.0	46.6	283.4
5	103.1	66.1	168.1	84.6	46.4	283.1
7	104.3	59.3	167.1	79.2	43.4	287.1

Tab.3. Thermal property of PHBV/EVA/OMMT blends

Fig.6. Mechanical properties of PHBV/EVA/OMMT splines

Fig.7. SEM images of the impact section of PHBV/EVA/OMMT splines

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