A Phosphazene-Silane hybrid crosslinker for room temperature vulcanized silicone rubber: Synthesis, structure and performance enhancement

IF 5.1 3区工程技术 Q1 CHEMISTRY, APPLIED

Reactive & Functional Polymers Pub Date : 2026-06-01 Epub Date: 2026-03-03 DOI:10.1016/j.reactfunctpolym.2026.106720

Peng Xiang , Dianpu Ma , Shuqun Zhang , Yiyuan He , You'’an Zhou , Aimin Xing , Wenhui Ma , Yunfei He , Shaoyun Shan

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Abstract

Room temperature vulcanized silicone rubber (RTV) crosslinked with conventional silane agents often suffers from limited thermal stability and mechanical properties. To address this issue, a novel phosphazene–silane hybrid crosslinking agent (HC-PD-KH) was synthesized from a phosphazene derivative and 3-glycidyloxypropyltrimethoxysilane (KH-560) via epoxy ring-opening reaction. HC-PD-KH was used as a crosslinking agent to prepare RTV with hydroxy terminated polydimethylsiloxane (PDMS) matrix in the presence of an organotin catalyst. Comprehensive characterization revealed remarkable performance improvements: TGA showed significantly enhanced thermal stability compared with KH-560 systems, the 10% weight loss temperature (T₁₀) rose from 385.7 °C to 444.5 °C, the char yield at 800 °C rose dramatically from 1.2% to 11.4%; DMA and tensile tests demonstrated higher damping properties, tensile strength and modulus: the tensile strength and elongation at break reached 1.26 MPa and 200%; water contact angle measurements indicated improved hydrophobicity, with the water contact angle increasing from 93.5° to 103.4°. These enhancements are attributed to the rigid backbone of phosphazene rings and phenyl groups, the contribution of polar NH moieties, and the uniform dispersion of HC-PD-KH within the silicone matrix. This study provides a promising strategy for the molecular design and crosslinking of high-performance RTV.

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室温硫化硅橡胶用磷腈-硅烷杂化交联剂的合成、结构及性能增强

室温硫化硅橡胶（RTV）与传统的硅烷交联剂通常具有有限的热稳定性和机械性能。为解决这一问题，以磷腈衍生物和3-缩水甘油氧基丙基三甲氧基硅烷（KH-560）为原料，通过环氧开环反应合成了新型磷腈-硅烷杂化交联剂（HC-PD-KH）。以HC-PD-KH为交联剂，在有机锡催化剂的存在下，以端羟基聚二甲基硅氧烷（PDMS）为基体制备了RTV。综合表征表明，与KH-560体系相比，TGA的热稳定性显著提高，10%失重温度（T₁0）从385.7℃提高到444.5℃，800℃时的炭收率从1.2%提高到11.4%；DMA和拉伸试验显示出较高的阻尼性能、抗拉强度和模量：抗拉强度和断裂伸长率分别达到1.26 MPa和200%；水接触角测试表明疏水性得到改善，水接触角从93.5°增加到103.4°。这些增强是由于磷腈环和苯基的刚性骨架，极性NH部分的贡献，以及HC-PD-KH在有机硅基体中的均匀分散。该研究为高性能RTV的分子设计和交联提供了一种有前途的策略。

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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.