铝酸酯偶联剂改性纳米云母粉对PLA/PBAT体系的影响

赵创创, 林勤保, 卢大勇, 钟怀宁, 程娟

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塑料科技 ›› 2024, Vol. 52 ›› Issue (02) : 84-89. DOI: 10.15925/j.cnki.issn1005-3360.2024.02.018
生物与降解材料

铝酸酯偶联剂改性纳米云母粉对PLA/PBAT体系的影响

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Effect of Aluminate Coupling Agent Modified Nano-MICA Powder on PLA/PBAT System

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摘要

文章采用聚乳酸（PLA）、聚己二酸丁二醇酯-共对苯二甲酸酯（PBAT）和铝酸酯偶联剂改性的纳米云母粉，通过熔融共混制备了纳米复合薄膜。通过傅里叶变换红外光谱仪（FTIR）、水蒸气透过率测试仪、氧气透过率测试仪、TG-DSC联用同步热分析仪表征纳米复合薄膜的性能。通过总迁移实验和气相色谱-质谱（GC-MS）测定纳米复合材料的特定迁移，评估了纳米复合材料的安全性。结果表明：铝酸酯偶联剂成功活化了纳米云母粉。改性纳米云母粉可以提高PLA的玻璃化转变温度，而PLA的结晶度先升高后降低，添加0.2%改性纳米云母粉效果最佳。PLA/PBAT体系的热稳定性随着改性纳米云母粉添加量的增加而略有下降。加入0.2%改性纳米云母粉使薄膜的水蒸气透过系数降低了28%。纳米云母粉的加入增强了薄膜的界面粗糙度，加入改性纳米云母粉后仍能满足作为食品接触材料的安全要求。

Abstract

Nanocomposite films were prepared by melting and blending nano-MICA powder modified with polylactic acid (PLA), polybutylene adipate-co-terephthalate (PBAT) and aluminate coupling agent. The properties of nanocomposite films were characterized by a Fourier transform infrared spectroscopy (FTIR), a water vapor transmittance tester, an oxygen transmittance tester, and TG-DSC synchronous thermal analysis instrument. The safety of nanocomposites was evaluated by total migration experiments and gas chromatography-mass spectrometry (GC-MS) to determine the specific migration of nanocomposites. The results show that the aluminate coupling agent successfully activates the nano-MICA powder. The glass transition temperature of PLA can be increased by modified nano-MICA powder, while the crystallinity of PLA first increases and then decreases, and the addition of 0.2% modified nano-MICA powder has the best effect. The thermal stability of the PLA/PBAT system decreases slightly with the increase of the amount of modified nano-MICA powder. The addition of 0.2% modified nano-MICA powder reduced the water vapor transmission coefficient of the film by 28%. The addition of nano-MICA powder enhances the interface roughness of the film, and the addition of modified nano-MICA powder can still meet the safety requirements as a food contact material.

关键词

纳米云母粉 / 聚乳酸 / 热稳定性 / 安全性能

Key words

Nano-MICA powder / Polylactic acid / Thermal property / Safety

中图分类号

TB332 / TS201.6

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赵创创 , 林勤保 , 卢大勇 , 等. 铝酸酯偶联剂改性纳米云母粉对PLA/PBAT体系的影响. 塑料科技. 2024, 52(02): 84-89 https://doi.org/10.15925/j.cnki.issn1005-3360.2024.02.018
ZHANG Chuang-chuang, LIN Qin-bao, LU Da-yong, et al. Effect of Aluminate Coupling Agent Modified Nano-MICA Powder on PLA/PBAT System[J]. Plastics Science and Technology. 2024, 52(02): 84-89 https://doi.org/10.15925/j.cnki.issn1005-3360.2024.02.018

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