Effects of organic modified hectorite on performance, isothermal crystallization behavior and interface interaction of poly(lactic acid) film

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2023-11-01 DOI:10.1016/j.clay.2023.107118

Yikelamu Jilili, Yumiao Ma, Zhe Wang, Weijun Zhen

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Abstract

In this work, in order to improve the properties of PLA, Hec-g@OA/PLA nanocomposite films were prepared by a single-screw extrusion film blown machine with PLA as a matrix and organically modified hectorite (Hec-g@OA) as a filler, and the optimum filler mass ratio of Hec-g@OA was preferred as an objective function of mechanical properties. The mechanical properties of PLA were found to increase from 24.31% to 61.75% when the mass percentage of Hec-g@OA was 0.3 wt%. Secondly, isothermal crystallization behavior of the nanocomposite films was analyzed by simultaneous rheology and FTIR technology for the purpose of further studied the effect of Hec-g@OA on the isothermal crystallization behavior of PLA, which showed that the half-crystallization time of Hec-g@OA/PLA decreased from 7.01 min, 28.99 min and 77.88 min to 3.87 min, 20.59 min and 65.78 min, respectively, at 130 °C, 135 °C and 140 °C. Finally, the form of the interaction between PLA and Hec-g@OA was analysis by electronic structure calculations and energy decomposition, it was analyzed that electrostatic interaction was found to be the main impact factor for induced crystallization of Hec-g@OA/PLA nanocomposite films, while induction and dispersion were found to be the minor impact factors.

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有机改性锂云母对聚乳酸膜性能、等温结晶行为及界面相互作用的影响

为了提高聚乳酸的性能，采用单螺杆挤出吹膜机，以聚乳酸为基体，有机改性赫托石(Hec-g@OA)为填料制备了Hec-g@OA/PLA纳米复合薄膜，并优选了最佳填料质量比Hec-g@OA作为力学性能的目标函数。当Hec-g@OA质量百分比为0.3 wt%时，PLA的力学性能从24.31%提高到61.75%。其次，通过同时流变学和FTIR技术分析纳米复合膜的等温结晶行为，进一步研究Hec-g@OA对PLA等温结晶行为的影响。结果表明，在130℃、135℃和140℃下，Hec-g@OA/PLA的半结晶时间分别从7.01 min、28.99 min和77.88 min降低到3.87 min、20.59 min和65.78 min。最后，通过电子结构计算和能量分解分析了PLA与Hec-g@OA的相互作用形式，发现静电相互作用是Hec-g@OA/PLA纳米复合膜诱导结晶的主要影响因素，而诱导和分散是次要影响因素。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...