超分子复合插层结构的构筑及其对聚丙烯抗老化行为研究

Light stabilizer and antioxidant are two most combined use additives in Polypropylene (PP), which aid to prolong the service life, retard the photo- and thermo-oxidative degradation of PP. Mixed homogeneity and migration towards the PP surface of two kinds of additives are two key factors that influence synergistic effect between the light stabilizer and the antioxidant against the anti-aging behavior of PP. In the project, the low molecular weight hindered-amine light stabilizers (HALSs), the low molecular weight hindered phenol anti-oxidants (HPAOs) and two dimensional inorganic layered materials (LDHs) are selected as the basic unit to construct multicomponent intercalation anti-aging agents with supramolecular structure by co-intercalating technology. We will systematically investigate photo- and thermo-oxidative degradation behavior and migration behavior of HALS/HPAO-LDH/PP composites, reveal the structure-performance relationship, and develop one kind of novel intercalated structure anti-aging agents with high performance, non-migration and multifunction. In the intercalated structure, the host-guest interaction, the guest-guest interaction, the blocking effect of lamellar structure, and the effect of inorganic-organic interface favor to significantly improve anti-aging performance, hinder migration of low molecular functional guests, and prolong longevity of PP. Therefore, this project is of vital theoretical significance and wide application promising on improving the core competence of Chinese Polypropylene industry in the world.

光稳定剂和抗氧剂是聚丙烯（PP）应用最广泛的两种并用功能助剂，其作用是减缓PP光热氧降解速率，延长制品使用寿命。两助剂复配的均一性及其向材料表面的迁移性是其效能发挥的两大难题。本项目拟以低分子量受阻胺、受阻酚和二维无机层状材料（LDHs）为基本单元，通过共插层关键技术构筑超分子复合插层结构抗老化剂，并研究其对PP光热氧化降解的抑制作用和在PP中的迁移行为，揭示结构与性能间的构效关系，创制一类全新结构的高效、耐迁移型、多功能、复合插层结构PP抗老化剂。借助LDHs中主体-客体间和层间客体-客体间的协同效应、主体层板对层间客体的锚定作用、无机层板片层结构的阻隔效应以及无机助剂与有机PP间的界面效应，大幅度提高其抗光热氧化降解性能，减少低分子量功能客体的外迁性，从而实现复合体系协同效应发挥的高效性和持久性。因此，该项目的研究对提升我国聚丙烯产业的核心竞争力具有重要的科学研究意义和广阔的应用前景。

光稳定剂和抗氧剂是聚丙烯（PP）应用最广泛的两种并用功能助剂，其作用是减缓PP光热氧降解速率，延长制品使用寿命。两助剂复配的均一性及其向材料表面的迁移性是其效能发挥的两大难题。本项目拟以低分子量受阻胺、受阻酚和二维无机层状材料（LDHs）为基本单元，将高分子量商业抗氧剂的四分之一结构和光稳定剂等单插层或共插层组装到MgAl-、CaAl-以及MgZnAl-LDHs层间，成功构筑系列超分子复合插层结构抗老化剂，系统研究其表面改性术以及与聚丙烯混合等关键技术，获得插层结构抗老化剂对PP光热氧化降解的抑制作用和在PP中的迁移行为，揭示结构与性能间的构效关系，创制一类全新结构的高效、耐迁移型、多功能、复合插层结构PP抗老化剂。借助LDHs中主体-客体间和层间客体-客体间的协同效应、主体层板对层间客体的锚定作用、无机层板片层结构的阻隔效应以及无机助剂与有机PP间的界面效应，大幅度提高其抗光热氧化降解性能，减少低分子量功能客体的外迁性，从而实现复合体系协同效应发挥的高效性和持久性。因此，该项目的研究对提升我国聚丙烯产业的核心竞争力具有重要的科学研究意义和广阔的应用前景。