Study on Structure and Properties of Toughened Poly(lactic acid) with Micro⁃Nano Complex Cells

doi:10.19491/j.issn.1001-9278.2020.04.004

Abstract

Abstract:

The polylactic acid (PLA)/poly (butylene adipate?butylene terephthalate) (PBAT) blends were prepared by melt blending. The effect of the content of epoxy chain extender (CE) as a compatibilizer on the rheological behavior and crystallization behavior of the blends was investigated, and the foaming behavior of the blend containing 5 phr CE under the cold crystallization condition and the tensile properties of the resulting foams were studied. The results indicated that the blending system presented an increase in compatibility and crystallization rate with an increase of CE content, and its expandability was improved. The micro?nano complex cells were obtained for the blend foam with 5 phr of CE. This blend foam achieved a cell density of 10¹³ cells/cm³ as like as the PLA foam, and its elongation at break increased by 40%.

Key words: polylactic acid, poly (butylene adipate?butylene terephthalate), cold crystallization, micro?nano complex cell

CLC Number:

TQ 321

Jingyue NI, Kesong YU, Yae TANG, Shihong CHEN, Xiangdong WANG. Study on Structure and Properties of Toughened Poly(lactic acid) with Micro⁃Nano Complex Cells[J]. China Plastics, 2020, 34(4): 20-24.

Figures/Tables 9

References 12

1	XU Z J, LIN X C, LIU H B. The Application of Blocked Polyfunctional Isocyanate as a Cross⁃Linking Agent In Biodegradable Extruded Poly(lactic acid) Foam[J]. Iranian Polymer Journal, 2019,28(5):417⁃424.
2	SCARFATO P, AVALLONE E, GALDI M R, et al.Preparation, Characterization, and Oxygen Scavenging Capacity of Biodegradable α⁃Tocopherol/PLA Microparticles for Active Food Packaging Applications[J]. Polymer Composites, 2017,38(5):981⁃986.
3	DING W, JAHANI D, CHANG E, et al.Development of PLA/Cellulosic Fiber Composite Foams Using Injection Molding: Crystallization and Foaming Behaviors[J].Composites Part A: Applied Science and Manufacturing,2016,83:130⁃139.
4	QIAN S P, ZHANG H H, YAO W C, et al.Effects of Bamboo Cellulose Nanowhisker Content on the Morphology, Crystallization, Mechanical, and Thermal Properties of PLA Matrix Biocomposites[J].Composites Part B: Engineering,2018,133:203⁃209.
5	JALALI⁃DIL E, CARREAU P J, FAVIS B D.Morphology, Miscibility and Continuity Development in Poly(lactic acid)/Poly(butylene adipate⁃co⁃terephthalate) Blends[J].Polymer,2015,68:202⁃212.
6	WU N J, ZHANG H. Mechanical Properties and Phase Morphology of Super⁃Tough PLA/PBAT/EMA⁃GMA Multicomponent Blends[J]. Materials Letters,2017,192:17⁃20.
7	NOFAR M, TABATABAEI A, SOJOUDIASLI H, et al.Mechanical and Bead Foaming Behavior of PLA⁃PBAT and PLA⁃PBSA Blends with Different Morphologies[J].European Polymer Journal,2017,90:231⁃244.
8	CHEN P, WANG W B, WANG Y Q, et al.Crystallization⁃Induced Microcellular Foaming of Poly (lactic acid) with High Volume Expansion Ratio[J].Polymer Degradation and Stability,2017,144:231⁃240.
9	NI J Y, YU K S, ZHOU H F, et al. Morphological Evolution of PLA Foam from Microcellular to Nanocellular Induced by Cold Crystallization Assisted by Supercritical CO₂[J].The Journal of Supercritical Fluids,2020, 158 .
10	WANG X D, LIU W, ZHOU H F, et al. Study on the Effect of Dispersion Phase Morphology on Porous Structure of Poly (lactic acid)/Poly (ethylene terephthalate glycol⁃modified) Blending Foams[J].Polymer,2013,54(21) :5 839⁃5 851.
11	GE Y K, YAO S, XU M L, et al.Improvement of Poly(ethylene terephthalate) Melt⁃Foamability by Long⁃Chain Branching with the Combination of Pyromellitic Dianhydride and Triglycidyl Isocyanurate[J]. Industrial & Engineering Chemistry Research,2019, 58(9) :3 666⁃3 678.
12	刘伟.聚乳酸共混体系的相界面调控及发泡行为研究[D]. 北京：北京化工大学, 2014.

样品	PLA/份	PBAT/份	CE/份
1^#	100	0	0
2^#	80	20	0
3^#	80	20	1
4^#	80	20	3
5^#	80	20	5
6^#	80	20	7

样品	PLA/份	PBAT/份	CE/份
1^#	100	0	0
2^#	80	20	0
3^#	80	20	1
4^#	80	20	3
5^#	80	20	5
6^#	80	20	7

样品	结晶度/%	熔融温度/℃
1^#	19.44±0.5	143.0/151.1±0.8
2^#	20.23±0.5	143.5/151.0±0.8
3^#	17.71±0.4	143.3/150.5±0.8
4^#	18.70±0.5	143.1/149.0±0.8
5^#	17.30±0.4	143.5/148.1±0.8
6^#	16.46±0.4	144.2/148.1±0.8

样品	结晶度/%	熔融温度/℃
1^#	19.44±0.5	143.0/151.1±0.8
2^#	20.23±0.5	143.5/151.0±0.8
3^#	17.71±0.4	143.3/150.5±0.8
4^#	18.70±0.5	143.1/149.0±0.8
5^#	17.30±0.4	143.5/148.1±0.8
6^#	16.46±0.4	144.2/148.1±0.8

温度/℃	泡孔尺寸/μm	泡孔密度/×10¹²个×cm^?3	发泡倍率
92	0.27±0.02	7.0±0.014	2.4±0.02
95	0.28±0.02	8.8±0.017	3.3±0.03
98	0.32±0.02	10.2±0.02	3.76±0.03
100	1.3±0.04	0.24±0.004	3.97±0.04