Effect of extrusion blowing process on microstructure and properties of PBAT/PLA blend

doi:10.19491/j.issn.1001-9278.2024.05.015

Abstract

Abstract:

The in⁃situ fibrillation films based on poly（adipic acid/butylene terephthalate）（PBAT）/poly（lactic acid）（PLA） blends were prepared by extrusion blowing through adjusting the extrusion process conditions such as die temperature and traction speed. The results indicated that PLA tended to form fibers in PBAT/PLA blend system with an increase in the traction speed at lower die temperature. The formed fibers tended to refine with an increase at first and then a decrease in the crystallinity. The longitudinal tensile strength and tensile modulus of in⁃situ fiber formed films also increased at first and then tended to decrease. The effect of PLA in⁃situ fibrillation was the most obvious in the blend at a die temperature of 150 ℃ and a traction speed of 5.0 m/min. Meantime， the longitudinal tensile strength and modulus of the films reached 40.0 and 723.9 MPa， respectively. Their tensile strength was 20 % higher than that of pure PBAT， whereas their tensile modulus was much higher than that of pure PBAT.

Key words: poly（adipic acid/butylene terephthalate）, poly（lactic acid）, in?situ fibrillation, extrusion blow molding, traction speed, die temperature, microstructure, film

CLC Number:

TQ320.66

YANG Chaoyong, GUO Jinqiang, WANG Fuyu, ZHANG Yuxia. Effect of extrusion blowing process on microstructure and properties of PBAT/PLA blend[J]. China Plastics, 2024, 38(5): 82-87.

Figures/Tables 13

Fig.1. Preparation process diagram of the MF⁃blend extrusion⁃blown film

Fig.2. SEM images of longitudinal cross⁃sectional morphology of MF⁃blend blown films at various traction speeds at a die temperature of 150 ℃

Fig.3. Micro⁃fiber morphology of the PLA in MF⁃blend blown films at a die temperature of 150 ℃

Fig.4. SEM images of longitudinal cross⁃sectional morphology of MF⁃blend blown films at various die temperature at a traction speed of 5.0 m/min

Fig.5. Micro⁃fiber morphology of the PLA in MF⁃blend blown films at various die temperature at a traction speed of 5.0 m/min

Fig.6. POM images of the crystal morphology of MF⁃blend after crystallization for 30 min at a die temperature of 150 ℃ and a traction speed of 5.0 m/min

样品	$T g 1 / ℃$	$T g 2 / ℃$	$T c c / ℃$	$∆ H c c /$ J·g^-1	$T c$ / $℃$	$∆ H c$ /J·g^-1	$T m / ℃$	$∆ H m$ /J·g^-1	X_c（PLA）/%	X_c（PBAT）/%
PBAT	-29.4	—	—	—	62.1	19.7	123.1	9.1	—	8.0
PLA	—	60.0	113.8	22.2	—	—	147.5	22.2	23.8	—
PBAT/PLA⁃150⁃4.0^a	-31.2	59.0	127.1	2.1	86.5	8.1	150.4	0.4	2.2	2.2
PBAT/PLA⁃150⁃5.0	-31.6	59.3	126.6	1.6	86.7	9.1	150.2	0.6	3.2	1.8
PBAT/PLA⁃150⁃6.0	-31.4	59.3	126.2	1.7	86.9	9.5	150.7	0.4	2.1	1.8
PBAT/PLA⁃150⁃7.0	-31.3	59.7	126.6	1.7	86.7	8.0	150.6	0.5	2.6	1.8

样品	$T g 1 / ℃$	$T g 2 / ℃$	$T c c / ℃$	$∆ H c c /$ J·g^-1	$T c$ / $℃$	$∆ H c$ /J·g^-1	$T m / ℃$	$∆ H m$ /J·g^-1	X_c（PLA）/%	X_c（PBAT）/%
PBAT	-29.4	—	—	—	62.1	19.7	123.1	9.1	—	8.0
PLA	—	60.0	113.8	22.2	—	—	147.5	22.2	23.8	—
PBAT/PLA⁃150⁃4.0^a	-31.2	59.0	127.1	2.1	86.5	8.1	150.4	0.4	2.2	2.2
PBAT/PLA⁃150⁃5.0	-31.6	59.3	126.6	1.6	86.7	9.1	150.2	0.6	3.2	1.8
PBAT/PLA⁃150⁃6.0	-31.4	59.3	126.2	1.7	86.9	9.5	150.7	0.4	2.1	1.8
PBAT/PLA⁃150⁃7.0	-31.3	59.7	126.6	1.7	86.7	8.0	150.6	0.5	2.6	1.8

Tab.1. Non⁃isothermal crystallization and melting behavior of the MF⁃blend blown films at various traction speed and a die temperature of 150 ℃

Fig.7. Crystallization and melting curves of the MF⁃bend blown films prepared at a die temperature of 150 ℃

样品	$T g 1 / ℃$	$T g 2 / ℃$	$T c c / ℃$	$∆ H c c /$ J·g^-1	$T c$ /℃	$∆ H c$ /J·g^-1	$T m / ℃$	$∆ H m$ /J·g^-1	X_c（PLA）/%	X_c（PBAT）/%
PBAT	-29.4	—	—	—	62.1	19.7	123.1	9.1	—	8.0
PLA	—	60.0	113.8	22.2	—	—	147.5	22.2	23.8	—
PBAT/PLA⁃130⁃5.0^b	-31.4	59.1	126.6	2.2	85.7	10.1	150.1	1.2	6.5	2.4
PBAT/PLA⁃140⁃5.0	-32.1	58.9	126.9	1.3	86.8	9.1	149.9	0.7	4.0	1.4
PBAT/PLA⁃150⁃5.0	-31.6	59.3	126.6	1.6	86.7	9.1	150.2	0.6	3.2	1.8
PBAT/PLA⁃160⁃5.0	-31.2	59.1	127.0	2.0	86.8	9.1	150.4	0.4	2.4	2.2

样品	$T g 1 / ℃$	$T g 2 / ℃$	$T c c / ℃$	$∆ H c c /$ J·g^-1	$T c$ /℃	$∆ H c$ /J·g^-1	$T m / ℃$	$∆ H m$ /J·g^-1	X_c（PLA）/%	X_c（PBAT）/%
PBAT	-29.4	—	—	—	62.1	19.7	123.1	9.1	—	8.0
PLA	—	60.0	113.8	22.2	—	—	147.5	22.2	23.8	—
PBAT/PLA⁃130⁃5.0^b	-31.4	59.1	126.6	2.2	85.7	10.1	150.1	1.2	6.5	2.4
PBAT/PLA⁃140⁃5.0	-32.1	58.9	126.9	1.3	86.8	9.1	149.9	0.7	4.0	1.4
PBAT/PLA⁃150⁃5.0	-31.6	59.3	126.6	1.6	86.7	9.1	150.2	0.6	3.2	1.8
PBAT/PLA⁃160⁃5.0	-31.2	59.1	127.0	2.0	86.8	9.1	150.4	0.4	2.4	2.2

Tab.2. Non⁃isothermal crystallization and melting behavior of the MF⁃blend blown films at various die temperature and a traction speed of 5.0 m/min

Fig.8. G' of the MF⁃blend blown films at various traction speed and a die temperature of 150 ℃

Fig.9. G'' of the MF⁃blends at various traction speed and a die temperature 150 ℃

Fig.10. η* of the MF⁃bend at various traction speed at a die temperature of 150 ℃

机头温度/ ℃	牵引速度/m·min^-1
	4.0		5.0		6.0		7.0
	拉伸强度	拉伸模量	拉伸强度	拉伸模量	拉伸强度	拉伸模量	拉伸强度	拉伸模量
130	19.0	174.7	21.2	362.8	22.6	369.6	15.4	323.8
140	32.6	474.6	55.2	705.5	38.0	733.4	32.7	801.1
150	35.4	615.5	40.0	723.9	47.5	749.5	36.7	702.9
160	39.6	711.1	27.7	439.8	24.1	466.9	24.6	647.6

Tab.3. Tensile properties of the MF⁃blend blown films

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