Preparation and properties of poly（lactic acid⁃co⁃glycolic acid） film

doi:10.19491/j.issn.1001-9278.2022.02.006

Abstract

Abstract:

Poly（lactic acid?co?glycolic acid）（PLLGA） was synthesized through one?step melt copolymerization using lactic acid （L?LA） and glycolic acid （GA） as raw materials， and its mechanical properties， crystallization properties and gas barrier properties were investigated. The crystalline characteristics of the PLLGA film were analyzed through Avrami equation using differential scanning calorimetry， and its mechanical and gas penetration performance were evaluated using a universal tensile testing machine and a differential pressure permeability meter through a differential pressure method. The results indicated that the introduction of GA generated a greater influence on the crystalline properties of the PLLGA film. GA could act as a nucleation agent to generate a nucleating effect on the PLLGA with a GA mole fraction of 4 %. The PLLGA film exhibited a faster crystallization rate than pure PLLA film， and its semi?crystallization time decreased. When the PLLGA had a GA mole fraction of 8 %， GA restricted the movement of the molecular chain， destroying the regularity between the copolymer molecules. This leads to a significant reduction in the crystalline properties of the PLLGA， making it in the amorphous state. With an increase in the mass ratio of GA， the PLLGA film presented a gradual decrease in tensile strength and elastic modulus， while its elongation at break increased significant. The elongation at break of the PLLGA with a GA mole fraction of 8 % reached 130.1 %， which was 21.3 times the value of pure PLLA film. In addition， the gas permeability of the PLLGA film decreased. Compared with the pure PLLA film， the O₂， CO₂， and N₂ permeability of PLLGA film with a GA mole fraction of 8 % at 5 ℃ were reduced by 47 %， 41 %， and 39 %， respectively.

Key words: poly（lactic acid）, poly（lactic acid?glycolic acid）, crystallization performance, mechanical property, gas barrier property

CLC Number:

TQ323.4

SUN Tao, YANG Qing, HU Jian, WANG Yangyang, LIU Bo, YUN Xueyan, DONG Tungalag. Preparation and properties of poly（lactic acid⁃co⁃glycolic acid） film[J]. China Plastics, 2022, 36(2): 33-40.

Figures/Tables 10

References 21

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样品	T_c/℃	n	K	t_1/2/min
PLLA	90	2.37	1.23×10^-2	5.28
	100	2.06	3.68×10^-2	4.15
	110	1.91	1.21×10^-2	8.31
PLLGA96/4	90	2.46	4.80×10^-2	2.96
	100	2.17	5.97×10^-2	3.09
	110	2.54	2.63×10^-3	8.99
PLLGA92/8	90	2.18	1.89×10^-3	15.00
	100	2.61	5.35×10^-5	37.73
	110	1.67	1.72×10^-4	143.75

样品	T_c/℃	n	K	t_1/2/min
PLLA	90	2.37	1.23×10^-2	5.28
	100	2.06	3.68×10^-2	4.15
	110	1.91	1.21×10^-2	8.31
PLLGA96/4	90	2.46	4.80×10^-2	2.96
	100	2.17	5.97×10^-2	3.09
	110	2.54	2.63×10^-3	8.99
PLLGA92/8	90	2.18	1.89×10^-3	15.00
	100	2.61	5.35×10^-5	37.73
	110	1.67	1.72×10^-4	143.75

样品	弹性模量/MPa	拉伸强度/MPa	断裂伸长率/%
PLLA	1 551.3±21	43.3±2	6.1±1
PLLGA96/4	1 020.4±12	33.2±3	62.9±4
PLLGA92/8	655.5±8	21.3±3	130.1±11

样品	弹性模量/MPa	拉伸强度/MPa	断裂伸长率/%
PLLA	1 551.3±21	43.3±2	6.1±1
PLLGA96/4	1 020.4±12	33.2±3	62.9±4
PLLGA92/8	655.5±8	21.3±3	130.1±11

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