Reprocessing, shape recovery and dielectric properties of nanocomposites of Polyhydroxyurethane with barium Titanate

IF 4.5 3区工程技术 Q1 CHEMISTRY, APPLIED

Reactive & Functional Polymers Pub Date : 2024-06-12 DOI:10.1016/j.reactfunctpolym.2024.105986

Muhammad Usman Saeed, Guohua Hang, Yuan Gao, Jiawei Hu, Lei Li, Tao Zhang, Sixun Zheng

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Abstract

Poly(N-vinyl pyrrolidone) (PVPy) chains were grafted onto the surfaces of barium titanate (BaTiO₃₎ nanoparticles via the surface-initiated living/controlled radical polymerization of N-vinyl pyrrolidone. The PVPy-grafted BaTiO₃ nanoparticles were then incorporated into a crosslinked polyhydroxyurethane (PHU) which was derived from bis(six-membered) cyclic carbonate and a triamine (i.e., Jeffamine T400). It was found that BaTiO₃ nanoparticles were uniformly dispersed into the PHU matrix. The generation of nanocomposites resulted that the glass transition temperatures (T_g’s) and mechanical properties were significantly enhanced. In the meantime, the nanocomposites had the dielectric properties superior to control PHU; the shape memory properties of the materials were significantly improved in terms of response, fixity of transient shape and recovery of the original shapes. Thanks to transcarbamoylation of hydroxyurethane structural units, the crosslinked nanocomposites can be reprocessed at elevated temperature. It was found that dibutyltin dilaurate (DBTDL) was an effective catalyst to decrease the Arrhenius activation energy of the dynamic reaction; the reprocessing of the nanocomposites can be carried out at the temperature as low as 120 °C.

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聚羟基聚氨酯与钛酸钡纳米复合材料的再加工、形状恢复和介电性能

通过 N-乙烯基吡咯烷酮的表面引发活/可控自由基聚合，将聚（N-乙烯基吡咯烷酮）（PVPy）链接枝到钛酸钡（BaTiO3）纳米粒子的表面。然后将 PVPy 接枝的 BaTiO3 纳米粒子加入交联聚羟基聚氨酯（PHU）中，PHU 由双（六元）环碳酸酯和三胺（即 Jeffamine T400）制成。研究发现，BaTiO3 纳米颗粒均匀地分散在 PHU 基质中。纳米复合材料生成后，其玻璃化转变温度（Tg）和机械性能显著提高。同时，纳米复合材料的介电性能优于对照 PHU；材料的形状记忆性能在响应、瞬态形状的固定性和原始形状的恢复方面都得到了明显改善。由于羟基聚氨酯结构单元的转氨基甲酰化作用，交联纳米复合材料可以在高温下进行再加工。研究发现，二月桂酸二丁基锡（DBTDL）是降低动态反应阿伦尼乌斯活化能的有效催化剂；纳米复合材料的再加工可以在低至 120 °C 的温度下进行。

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.