Effect of titanate coupling agent on antioxidant property and UV blocking property of PBAT/lignin composite films

IF 5 2区 材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
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Abstract

PBAT is the largest amount of biomass-degradable plastics on the market at present, and its application in related fields is limited due to its defects such as poor weather resistance. In this study, the surface modification of lignin by titanate coupling agent was realized by the melt extrusion reaction method of non-catalytic system, and the PBAT/cotton straw lignin composite film was prepared by melt blending and blow molding with PBAT at a certain ratio. The structure and properties of the specimens were analyzed before and after the artificial accelerated aging test using characterization means such as DSC, SEM, IR, transmittance and mechanical properties. The results showed that the tensile strength and elongation at break ratios of the composite film increased by 36.99 % and 34.31 %, respectively, compared with the pure PBAT film when the titanate coupling agent modified lignin was 10 %; the retained value of elongation at break of the specimen on the sixth day of thermo-oxidative light aging increased by 13.33 %; and the UV transmittance at 500 nm was reduced by 96.95 %; And through the comprehensive evaluation system of material stability, the temperature aging kinetic model was established and a temperature sensitivity analysis was performed, and it was found that the specimen with 10 % lignin content had a significant reduction in temperature sensitivity. The composite film developed in this study maintains the fully biodegradable properties of PBAT while introducing the characteristics of functional modifiers, which provides a new idea to broaden the application in the field of packaging and helps to reduce the production cost.
钛酸酯偶联剂对 PBAT/木质素复合薄膜抗氧化性和紫外线阻隔性的影响
PBAT是目前市场上用量最大的生物质降解塑料,由于其耐候性差等缺陷,在相关领域的应用受到限制。本研究采用非催化体系的熔融挤出反应法实现了钛酸酯偶联剂对木质素的表面改性,并与PBAT按一定比例熔融共混吹塑制备了PBAT/棉秆木质素复合膜。利用 DSC、SEM、IR、透射率和力学性能等表征手段分析了人工加速老化试验前后试样的结构和性能。结果表明,当钛酸酯偶联剂改性木质素的比例为 10 % 时,复合薄膜的拉伸强度和断裂伸长率与纯 PBAT 薄膜相比分别提高了 36.99 % 和 34.31 %;热氧化光老化第六天试样的断裂伸长率保留值提高了 13.通过材料稳定性综合评价体系,建立了温度老化动力学模型,并进行了温度敏感性分析,发现木质素含量为10%的试样温度敏感性显著降低。本研究开发的复合薄膜既保持了 PBAT 的全生物降解特性,又引入了功能改性剂的特性,为拓宽其在包装领域的应用提供了新思路,并有助于降低生产成本。
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来源期刊
Polymer Testing
Polymer Testing 工程技术-材料科学:表征与测试
CiteScore
10.70
自引率
5.90%
发文量
328
审稿时长
44 days
期刊介绍: Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.
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