Study on Modification of Polylactic Acid/Poly(3⁃Hydroxybutyric Acid⁃co⁃3⁃Hydroxyvalate) Blends as 3D⁃Printing Filament

doi:10.19491/j.issn.1001-9278.2020.07.006

Abstract

Abstract:

A series of polylactic acid (PLA)/poly(3?hydroxybutyric acid?co?3?hydroxyvalate) (PHBV), PLA/PHBV/styrene?methacrylate glycidyl copolymer (ADR) and PLA/PHBV/tributyl citrate (TBC) blends were prepared by a melt blending method, and the standard test bars were prepared by injection molding and fused deposition molding (FDM) techniques. The effects of ADR and TBC as modifiers on the thermal and mechanical properties of PLA/PHBV blends and 3D?printed specimens were investigated. The results indicated that the crystallinity of PHBV was decreased, and the injection?molded sample with ADR exhibited the maximum elongation at break with an increment rate of 32 %. Moreover, the incorporation of TBC also improved the tensile strength and impact strength of the injection?molded sample, and its elongation at break increased by 2.8 %. The 3D?printed specimens presented a decrease in tensile strength but an increase in elongation at break due to the introduction of ADR. Meanwhile, the compatibility of 3D?printed specimens was improved significantly in the presence of TBC. There was no obvious particle phase observed from SEM, and the tensile strength of blends did not change significantly after the modification.

Key words: polylactic acid, poly (3?hydroxybutyric acid?co?3?hydroxyvalate), chain extender, plasticizer, three?dimensional printing

CLC Number:

TQ 321

Yu ZU, Yanan REN, Jing HU. Study on Modification of Polylactic Acid/Poly(3⁃Hydroxybutyric Acid⁃co⁃3⁃Hydroxyvalate) Blends as 3D⁃Printing Filament[J]. China Plastics, 2020, 34(7): 36-43.

Figures/Tables 10

References 21

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PLA/PHBV /ADR/TBC	T_g,PLA/℃	T_g,PHBV/℃	T_cc/℃	?H_cc，PHBV/ J·g^-1	T_m,PLA/℃	T_m,PHBV/℃	?H_m，PHBV/ J·g^-1	Χ_PHBV/%
85/15/0/0	55.22	-1.76	114.59	9.25	149.22	168.50	10.86	11.72
80/20/0/0	55.52	-1.20	114.09	10.95	149.68	168.35	13.86	15.89
75/25/0/0	55.56	-0.78	104.57	12.30	149.33	171.83	17.08	20.89
70/30/0/0	55.62	-1.27	108.15	14.23	148.97	171.67	22.23	29.13
60/35/0/0	55.44	-0.43	105.24	11.53	149.21	171.80	21.04	29.69
85/15/0.3/0	59.13	2.37	136.32	3.15	152.01	173.88	3.697	3.99
80/20/0.3/0	60.8	2.67	131.35	2.97	152.44	173.32	3.764	4.32
75/25/0.3/0	59.07	2.23	132.84	4.70	151.22	172.65	6.525	7.98
70/30/0.3/0	59.88	1.90	130.57	3.94	150.21	170.33	6.586	9.63
65/35/0.3/0	59.35	1.88	121.88	7.99	151.37	170.66	14.58	20.58
85/15/0/2	51.8	-1.32	130.08	1.10	151.68	172.90	2.94	13.37
80/20/0/2	53.29	-2.23	132.54	2.94	150.00	171.54	7.83	26.71
75/25/0/2	54.14	-2.14	128.89	4.24	148.62	169.42	11.29	30.80
70/30/0/2	53.96	-3.23	113.93	6.62	148.58	167.00	17.60	40.01
65/35/0/2	53.99	-3.81	118.48	6.03	148.40	166.81	16.04	31.26

PLA/PHBV /ADR/TBC	T_g,PLA/℃	T_g,PHBV/℃	T_cc/℃	?H_cc，PHBV/ J·g^-1	T_m,PLA/℃	T_m,PHBV/℃	?H_m，PHBV/ J·g^-1	Χ_PHBV/%
85/15/0/0	55.22	-1.76	114.59	9.25	149.22	168.50	10.86	11.72
80/20/0/0	55.52	-1.20	114.09	10.95	149.68	168.35	13.86	15.89
75/25/0/0	55.56	-0.78	104.57	12.30	149.33	171.83	17.08	20.89
70/30/0/0	55.62	-1.27	108.15	14.23	148.97	171.67	22.23	29.13
60/35/0/0	55.44	-0.43	105.24	11.53	149.21	171.80	21.04	29.69
85/15/0.3/0	59.13	2.37	136.32	3.15	152.01	173.88	3.697	3.99
80/20/0.3/0	60.8	2.67	131.35	2.97	152.44	173.32	3.764	4.32
75/25/0.3/0	59.07	2.23	132.84	4.70	151.22	172.65	6.525	7.98
70/30/0.3/0	59.88	1.90	130.57	3.94	150.21	170.33	6.586	9.63
65/35/0.3/0	59.35	1.88	121.88	7.99	151.37	170.66	14.58	20.58
85/15/0/2	51.8	-1.32	130.08	1.10	151.68	172.90	2.94	13.37
80/20/0/2	53.29	-2.23	132.54	2.94	150.00	171.54	7.83	26.71
75/25/0/2	54.14	-2.14	128.89	4.24	148.62	169.42	11.29	30.80
70/30/0/2	53.96	-3.23	113.93	6.62	148.58	167.00	17.60	40.01
65/35/0/2	53.99	-3.81	118.48	6.03	148.40	166.81	16.04	31.26

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