Controllable confinement nano-reinforced organic–inorganic cyanate ester resins with optimal modulus and dielectric properties trade-offs,Polymer Chemistry

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Controllable confinement nano-reinforced organic–inorganic cyanate ester resins with optimal modulus and dielectric properties trade-offs
Polymer Chemistry ( IF 4.1 ) Pub Date : 2024-06-06 , DOI: 10.1039/d4py00481g
Yushan Wu ₁ , Yu Xiang ₁ , Hantian Lu ₁ , Faxiang Qin ₁ , Peng Xu ₁ , Hua-Xin Peng _{1,

2}

Affiliation

Nano-reinforced resins are widely used in the aerospace field, but the improvement of the mechanical properties of nano-modified resins is always low or they are even decreased due to the unsatisfactory dispersion and interfacial properties of nano-fillers. A monofunctional polyhedral oligomeric silsesquioxane (POSS) after recrystallization is introduced into a cyanate ester (CE) by pre-reacting with epoxy to form an organic–inorganic hybrid crosslinking network for performance enhancement. The size of POSS aggregates in the CE decreased after recrystallization and pre-reaction, improving the dispersion into the crosslinking network. The effects of the microstructure and reaction route of the POSS on the crosslinking network are evaluated across the synthesis of pendant and telechelic POSS moieties. Results reveal that only when the size of the monofunctional POSS aggregates and the POSS–polymer configuration match the crosslinking network, can POSS simultaneously introduce free volume due to the nanocore while restricting the chain mobility. Through the comprehensive utilization of the physicochemical properties of POSS for the confinement of POSS in the resin, the CE modified with pendant POSS moieties exhibits a superior modulus (4033 MPa), higher glass transition temperature (271.2 °C), and improved dielectric properties at 3 wt% loading of POSS. This effective strategy is proposed to regulate the interactions between inorganic nano-fillers and organic crosslinking networks, which provides guidance to achieve a simultaneous enhancement in thermosetting resin stiffness and dielectric properties.

中文翻译：

具有最佳模量和介电性能权衡的可控约束纳米增强有机-无机氰酸酯树脂

纳米增强树脂在航空航天领域有着广泛的应用，但由于纳米填料的分散性和界面性能不理想，纳米改性树脂的机械性能提高幅度始终较低甚至下降。重结晶后的单官能多面体低聚倍半硅氧烷（POSS）通过与环氧树脂预反应引入氰酸酯（CE）中，形成有机-无机杂化交联网络以增强性能。经过再结晶和预反应后，CE 中 POSS 聚集体的尺寸减小，从而改善了在交联网络中的分散性。通过合成侧链和遥爪 POSS 部分，评估了 POSS 的微观结构和反应路线对交联网络的影响。结果表明，只有当单官能 POSS 聚集体的尺寸和 POSS-聚合物构型与交联网络相匹配时，POSS 才能同时由于纳米核而引入自由体积，同时限制链的流动性。通过综合利用 POSS 的物理化学性质将 POSS 限制在树脂中，用 POSS 侧基修饰的 CE 表现出优异的模量（4033 MPa）、更高的玻璃化转变温度（271.2 °C）和改善的介电性能。 POSS 负载量为 3 wt%。提出了这种有效策略来调节无机纳米填料和有机交联网络之间的相互作用，这为实现热固性树脂刚度和介电性能的同时增强提供了指导。

更新日期：2024-06-06

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