Effect of Modified Xylan on Packaging Performance of PBAT/PLA Composites

doi:10.19491/j.issn.1001-9278.2020.12.003

Abstract

Abstract:

Xylan was modified with a silane coupling agent， KH560， and then used to prepared the poly（butylene adipate-co-terephthalate）（PBAT）/poly（lactic acid）（PLA）/xylan composite films through melt blending. The effect of the content of the modified xylan on the mechanical properties， oxygen permeability， moisture permeability and light transmission of the composite films was investigated. The results indicated that the composite films achieved optimum tensile strength and oxygen transmission rate at a xylan content of 1 wt%. The tensile strength of the composite films increased by 11.7 % compared to that of pristine PBAT/PLA film， while their oxygen transmission rate was also higher than that of the pristine one. However， their oxygen transmission coefficient was reduced by 32.7 %. The moisture resistance of the composite films with the modified xylan was significantly higher than that of the unmodified one. Moreover， the haze of the composite films increased with an increase in the xylan content.

Key words: poly（butylene adipate-co-terephthalate）, polylactic acid, xylan, composite material

CLC Number:

TQ321

GUO Haoran, CHEN Yunzhi∗, WANG Jiaoyang, ZHANG Zhengjian, SUN Lingze. Effect of Modified Xylan on Packaging Performance of PBAT/PLA Composites[J]. China Plastics, 2020, 34(12): 17-24.

Figures/Tables 13

Fig.1. Structure of PBAT

Fig.2. Chemical structure of xylan

Fig. 3. Flow chart of xylan modification

序号	PBAT/%	PLA/%	xylan/%	s?xylan/%
1	70.00	30.00	0	0
2	69.65	29.85	0.5	-
3	69.30	29.70	1	-
4	68.60	29.40	2	-
5	67.90	29.10	3	-
7	69.65	29.85	-	0.5
8	69.30	29.70	-	1
9	68.60	29.40	-	2
10	67.90	29.10	-	3

Tab.1. Mass ratio of PBAT/PLA/(s?)xylan blend masterbatch

Fig. 4. XRD analysis of PBAT/PLA/s?xylan composite films

Fig.5. PLM photos of PBAT/PLA/s?xylan composite films

Fig.6. Micro?section structure of PBAT/PLA/s?xylan composite films

Fig.7. DSC secondary heating curve of PBAT/PLA /s?xylan composite films

s?xylan含量/%	T_g/℃	T_m/℃	ΔH_m/J·g^-1	ΔX_c/%
0	63.76	167.08	6.1448	21.9
0.5	64.31	167.28	6.9161	24.6
1	66.55	166.38	5.9000	21.0
2	62.86	166.06	5.6276	20.0
3	60.93	166.19	5.0792	18.1

Tab.2. Secondary heating DSC curve parameters of PBAT/PLA/s?xylan composite films

Fig.8. Effect of different content of s?xylan on mechanical properties of PBAT/PLA composite films

Fig.9. Effect of S?xylan on oxygen permeability of PBAT/PLA composite films

Fig.10. Effect of s?xylan on the moisture permeability of PBAT/PLA composite films

Fig.11. Optical properties of PBAT/PLA/s?xylan composite films

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