功能导向的镁基多客体插层结构抗光老化材料设计、组装及性能研究

The PP molecule undergoes considerable degradation under the condition of light and oxygen due to its high active tertiary hydrogen. Aiming to improve the photoaging resistance of PP resin, we will carry out design, assembly, and performance study of antiaging functional materials with multi-guest intercalated superamolecular structure by taking the advantage of the abundant magnesium resource in the saline lakes of Qaidam, the intercalation property and flexible composition and structure of layered double hydroxides (LDH) in this project. The Zn, Ti, Ce, La, Eu, and Sm elements with ultraviolet blocking ability will be introduced into the host layer of MgAl-LDH to offer ultraviolet inhibition function, and both organic reductant and light stabilizer will be intercalated into the interlayer of LDH as functional guests to fabricate antiaging functional materials with multi-guest intercalation superamolecular structure. The host-guest interactions, ultraviolet inhibition effect of host layers, and gust-guest interactions help to enhance the migration resistance, thermal stability, and light stability of interlayer guests. The synergistic effects of host-guest, gust-guest, and the heat and oxygen inhibition action of two-dimensional layered structure will improve the thermal and optical oxidative aging resistance performance of PP resin. The relationship between the composition, size and structure with the anti-photoaging performance of the obtained LDH will be investigated in detail to reveal the synergistic effects of host-guest, gust-guest, and the two-dimensional layered structure. This study will open new window for high value utilization of magnesium resources of the lakes, and offer new ways for the design of high performance anti-photoaging functional materials. Therefore, this study has significant theoretical value and wide practic application prospect.

针对PP树脂中高活性叔氢在光照和氧气作用下易发生氧化而导致PP制品性能劣化的缺点，本项目基于青海盐湖丰富的镁资源与LDH类材料可插层组装及组成和结构均可调控的特点，以抗光老化功能为导向，开展镁基多客体超分子插层结构抗光老化材料的设计、组装及性能研究。将Zn、Ti、Ce、La、Eu、Sm等紫外阻隔功能元素引入MgAl-LDH层板、将功能客体还原剂和光稳定剂共同引入层间构筑插层结构抗光老化功能材料。借助主客体和客客体相互作用与层板紫外阻隔作用增强客体的耐迁移性、热稳定性和光稳定性，利用主客体与客客体协同效应及二维层状结构热、氧阻隔效应提升PP树脂的抗光老化性能。研究插层结构材料组成、尺寸、微介观结构与抗光老化性能之间的关系，揭示主客体、客客体及层状结构协同作用规律。本项目研究将为实现盐湖镁资源高值利用开辟新的途径并为高性能抗光老化功能材料设计提供新思路，具有重要的理论价值和实际应用前景。

PP树脂中高活性叔氢在光照和氧气作用下易发生氧化而导致PP制品性能劣化，需加入有机光稳定剂以提高PP的抗光老化性能，但这些光稳定剂存在热稳定性欠佳、耐迁移性差等缺点。水滑石（LDH）是一类层状阴离子型黏土，主体层板上的原子以共价键相结合，主体层板与层间客体间存在范德华力、静电、氢键等多种作用力，同时层间客体间存在较弱的分子间作用力，主体层板和层间客体呈高度有序交替排列，具有典型的超分子结构特征。LDH类材料特殊的结构和组成使其兼具LDH主体层板和层间客体的双重性质，并且二者还可产生协同作用，赋予此类材料更优异的性能，极大地扩展了其应用领域。.本项目基于青海盐湖丰富的镁资源与LDH类材料可插层组装及组成和结构均可调控的特点，以抗光老化功能为导向，开展多客体超分子插层结构镁基抗光老化材料的设计、组装及性能研究。取得如下研究成果：利用LDH层状材料层板元素可调变、层间客体种类和数量可调控、层间客体可交换性等特点，设计和构筑了多种用于PP抗光老化的新型功能材料，掌握了多客体插层结构LDH的新型制备方法。研究表明：紫外吸收剂HMBA与还原剂SA共插层MgAl-LDH、紫外吸收剂HMBA与CA共插层MgZnAl-LDH、受阻胺插层MgAl-LDH、SDS与紫外吸收剂共插层MgAl-LDH以及SDS与受阻胺共插层MgAl-LDH分别使PP的光老化程度降低了50%、70%、70%、65%和75%以上。该类插层结构抗光老化功能材料具有多种优势：（1）LDH主体层板可提供稳定、保护和锚固作用，显著提高了层间功能客体的热稳定性和耐迁移性；（2）LDH具有二维层状结构，减缓了热量传递和氧气的扩散与渗透，降低了PP的老化速率。（3）层间功能客体可发挥协同抗光老化作用，提高抗光老化效果。项目研究不仅构筑了多种新型多客体超分子插层结构抗光老化功能材料，提高了PP的抗光老化性能，而且对实现盐湖废弃镁资源的高值利用，促进盐湖资源的可持续开发和综合利用也具有重要的促进作用。

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