A new perspective on the glass transition, tack and rheology of oligomeric epoxy resins

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of Non-crystalline Solids Pub Date : 2024-10-17 DOI:10.1016/j.jnoncrysol.2024.123261

LM Amirova , KA Andrianova , AM Gaifutdinov , RR Amirov

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Abstract

Bis-phenol A based oligomeric epoxy resins with known molecular characteristics were selected as model liquids for the study of glass transition processes, rheological properties and tack. The effect of cooling and heating rates on the glass transition dynamics of epoxy resins has been studied. Rheology and differential scanning calorimetry methods were used to determine the fragility indices of oligomeric epoxy resins. The tack of oligomers was determined as a function of the reduced temperature T/Tg, and it is shown that the tack parameters for all studied oligomers correlate well with their fragility indices.

Rheological measurements of epoxy oligomers were performed in the oscillation mode in a wide frequency range. Applying the principle of time-temperature superposition, generalized dependencies of the storage and loss modulus on the weight average molecular weight and molecular-mass distribution was determined. The parameters of generalized frequency dependences of the complex modulus components and the molecular weight characteristics of oligomers were correlated.

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低聚环氧树脂玻璃化转变、粘性和流变学的新视角

研究人员选择了已知分子特性的双酚 A 型低聚环氧树脂作为模型液体，用于研究玻璃化转变过程、流变特性和粘性。研究了冷却和加热速率对环氧树脂玻璃化转变动力学的影响。流变学和差示扫描量热法用于确定低聚环氧树脂的脆性指数。研究结果表明，所有研究的低聚物的粘性参数都与其脆性指数密切相关。应用时间-温度叠加原理，确定了储存模量和损失模量与重量平均分子量和分子质量分布的一般相关性。复合模量分量的广义频率相关参数与低聚物的分子量特征相关。

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来源期刊

Journal of Non-crystalline Solids 工程技术-材料科学：硅酸盐

CiteScore

6.50

自引率

11.40%

发文量

576

审稿时长

35 days

期刊介绍： The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.