Tuning of Microstructure of PLA/PBAT/OMMT Nanocomposite

doi:10.19491/j.issn.1001-9278.2020.04.007

Abstract

Abstract:

PLA is anchored onto OMMT in a torque rheometer by ADR, and the resultant PLA/OMMT/ADR is compounded with PBAT to make （PLA/OMMT/ADR）/PBAT nanocomposite. Facial tension of various composites and interfacial tension between different phases were calculated by testing the contact angle, leading to the wetting coefficient between PLA and PBAT and OMMT, respectively. Microstructure of the nanocomposite was observed by TEM and SEM. IR?FT shows that PLA was anchored onto OMMT. With the increasing of ADR, the wetting coefficient between different phases decreased, leading to the transformation of OMMT in the interfaces between PLA and PBAT to PLA domain. It can be seen from TEM that OMMT was exfoliated and well distributed in （PLA/OMMT/ADR）/PBAT system, which is attributed to the improvement of affinity between PLA and PBAT, as well as the movement of OMMT from PLA domains to the interfaces between PLA and PBAT and PBAT domains. Pictures from SEM shows that with the increasing loading of ADR, the interfaces between PLA and PBAT became blurred, which means the increase of the compatibility between PLA and PBAT.

Key words: poly (lactic acid), poly (butylene adipate?co?terephthalate), organically modified montmorillonite, nanocom?posite, mocrostructure, tuning

CLC Number:

TQ 321

Xiangyu WANG, Yuxia ZHANG. Tuning of Microstructure of PLA/PBAT/OMMT Nanocomposite[J]. China Plastics, 2020, 34(4): 35-41.

Figures/Tables 12

样品编号	PLA/份	OMMT/份	ADR/份
1^#	80	2	0
2^#	80	2	0.2
3^#	80	2	0.4
4^#	80	2	0.6
5^#	80	2	0.8

Tab.1. Composition of PLA/OMMT composites

样品编号	PLA/份	OMMT/份	ADR/份	PBAT/份
6^#	80	2	0	20
7^#	80	2	0.2	20
8^#	80	2	0.4	20
9^#	80	2	0.6	20
10^#	80	2	0.8	20

Tab.2. Formula of (PLA /OMMT)/PBAT composites

Fig.1. Factors influencing the selective distribution of nanoparticles in polymers

Fig.2. FTIR spectra of the resultant samples

Fig.3. Reaction scheme of ADR with various ingredients

样品组成	界面张力 $γ P L A - O M M T$	界面张力	界面张力 $γ P B A T - O M M T$	浸润系数ω_a
PLA?PBAT	2.138	8.892	3.057	-0.103
1^#?PBAT	1.183	6.638	3.057	-0.282
2^#?PBAT	1.428	6.965	3.057	-0.234
3^#?PBAT	2.984	11.606	3.057	-0.006
4^#?PBAT	0.836	4.895	3.057	-0.454
5^#?PBAT	0.218	1.725	3.057	-1.646

样品组成	界面张力 $γ P L A - O M M T$	界面张力	界面张力 $γ P B A T - O M M T$	浸润系数ω_a
PLA?PBAT	2.138	8.892	3.057	-0.103
1^#?PBAT	1.183	6.638	3.057	-0.282
2^#?PBAT	1.428	6.965	3.057	-0.234
3^#?PBAT	2.984	11.606	3.057	-0.006
4^#?PBAT	0.836	4.895	3.057	-0.454
5^#?PBAT	0.218	1.725	3.057	-1.646

Tab.3. Interfacial tension and wetting coefficient between each two ingredients

Fig.4. Wetting coefficients of PBAT with various samples

Fig.5. TEM of PLA/PBAT/OMMT,（PLA/OMMT）/PBAT and （PLA/OMMT/ADR）/PBAT composites

Fig.6. XRD of PLA/PBAT/OMMT,（PLA/OMMT）/PBAT and （PLA/OMMT/ADR）/PBAT composites

Fig.7. Viscosity ratio of PBAT over PLA against ADR loading

Fig.8. SEM of （PLA/OMMT/ADR）/PBAT composites

Fig.9. PLM of （PLA/OMMT/ADR）/PBAT composites

References 15

1	SINHA R S, OKAMOTO M. Polymer/Layered Silicate Nanocomposites: A Review from Preparation to Processing[J]. Prog Polym Sci,2003,28:1539⁃1641.
2	AHMED J, VARSHNEY S K. Polylactides⁃chemistry, Properties and Green Packaging Technology: A Review[J]. International Journal of Food Properties,2010,14:37⁃58.
3	LIU H Z, ZHANG J W. Research Progress in Toughening Modification of Poly(lactic acid)[J]. J Polym Sci B: Polym Phys, 2011, 49:1 051⁃1 083.
4	DONG W F，ZOU B S，MA P M，et al.Influence of Phthalic Anhydride and Bioxazoline on the Mechanical and Morphological Properties of Biodegradable Poly(lactic acid)/Poly[(butylenesadipate)⁃co⁃terephthalate] Blends[J]. Polym Int, 2013, 62: 1 783⁃1 790.
5	JEN T Y, TSOU C H,HUANG C Y, et al. Compatible and Crystallization Properties of Poly(lactic acid)/Poly(butylene adipate⁃co⁃terephthalate) Blends[J]. Journal of Applied Polymer Science, 2010, 116:680⁃687.
6	ENIC Q, ALEJANDRO J M.Isothermal Cold⁃Crystallization of PLA/PBAT Blends With and Without the Addition of Acetyl Tributyl Citrate[J]. Macromolecular Chemistry and Physics, 2012, 213:36⁃48.
7	BATES C M，SESHIMO T,MAHER M J, et al.Polarityswitching Top Coats Enable Orientation of Sub⁃10⁃nm Block Copolymer domains[J].Science,2012,338(6108):775⁃779.
8	汪　昊．聚乳酸复合材料的制备及性能[D]．广州：华南理工大学，2013．
9	陈小英.有机蒙脱土对聚乳酸/弹性体不相容共混体系微观形貌的调控及性能研究[D].海南大学，2015.
10	ANDREAS G, ABRAHAM M, GAURAV R,et al. Shape⁃Dependent Localization of Carbon Nanotubes and CarbonNanotubes and Carbon Black in an Immiscible Polymer Blend during Melt Mixing[J].Macromolecules, 2011, 44 (15): 6 094⁃6 102.
11	王翔宇，张玉霞.纳米粒子在聚合物共混物中的选择性分布研究进展[J].中国塑料，2017,31（3）：7⁃14.
	WANG X Y, ZHANG Y X.Progress in Research on Selective Localization of Narnoparticles in Polymer Blends[J].China Plastics,2017,31（3）：7⁃14.
12	WU D F, ZHANGY S, ZHANG M, et al.Selective Localization of Multiwalled Carbon Nanotubes in Poly(ε⁃caprolactone)/Polylactide Blend[J]. Biomacromolecules,2009, 10(2):417⁃424.
13	ARAVIND D,YU Z Z,MAI Y M. Effect of Blending Sequence on Microstructure of Ternary Nanocomposites[J].Polymer,2005,46(16):5 986⁃5 991.
14	WU D F, LIN D P, ZHANG J,et al.Selective Localization of Nanofillers: Effect on Morphology and Crystallization of PLA/PCL Blends[J]. Macromol Chem Phys,2011, 212:613⁃626.
15	王翔宇，张玉霞.制备工艺对PLA/PBAT/OMMT三元复合材料微观结构与性能的影响; 中国塑料，2019，33（9）：27⁃32.
	WANG X Y, ZHANG Y X.Effect of Preparation Process on Microstructure and Properties of PLA/PBAT/OMMT Ternary Composites[J].China Plastics,2019，33（9）：27⁃32.

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