Effect of Curing State on Time-Temperature Dependence of Mechanical Properties for Epoxy Composites

固化状态对环氧复合材料机械性能时间-温度依赖性的影响

• 批准号: 13650074
• 负责人: ADACHI Tadaharu
• 金额: $ 2.11万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650074/
• 关键词: Epoxy Resin; Silica Particulate-Filled Epoxy; Mechanical Property; Glass Transition Temperature; Fragility; Fracture Toughness; Thermo-viscoelasticity; Time-Temperature Dependence

In the research, we studied effect of curing state on mechanical properties of bisphenol A type epoxy resin and silica particulate-filled epoxy composite for long time and wide temperature ranges.Specimens were bisphenol A type epoxy resin cured under several combinations of temperature and time. Glass transition temperatures and fragilities were derived from the results of thermo-viscoelasticity. By Raman spectroscopic analysis, it was clear that the glass transition temperature is directly related to cross-linking degree reaction of epoxy resin. The fragility which denotes heterogeneous microstructure decreased when the glass transition temperature was saturated.Elastic moduli and fracture toughness at room temperature were measured for each epoxy resin. The elastic moduli were approximately constant for epoxy resin with saturated glass transition temperature. The fracture toughness was strongly dependent on curing conditions. The fracture toughness of the epoxy resin increased as th … More e fragility decreased when the glass transition temperature was saturated at approximately 400 K.Similar experiments were conducted for fused silica particle-filled bisphenol A type epoxy. As the results, the fracture toughness of composites increased for high glass transition temperature and low fragility. Therefore, it was confirmed that the glass transition temperature and the fragility are effective parameters for estimating mechanical properties of epoxy resin and its composite.Time-temperature dependences of fracture toughnesses for epoxy resin and silica particulate-filled epoxy composite were measured. The fracture toughnesses follow time-temperature equivalent principle determined by thermo-viscoelatic properties. The fracture toughness with a smaller fragility increased from lower temperature to the brittle-ductile transition temperature than that with a larger fragility when the glass transition temperature was approximately 400 K. Finally fracture of a cylinder with a crack was predicted mathematically based on time-temperature dependence of fracture toughness.Based on finding that glass transition temperature and fragility are very useful in estimating mechanical properties, these parameters were proposed as the parameters for setting the curing conditions of epoxy resin and its composite. Less

本研究以双酚A型环氧树脂为试件，在不同的温度和时间组合下进行固化，研究了固化状态对双酚A型环氧树脂和SiO2颗粒填充环氧复合材料长时间、宽温度范围内力学性能的影响。玻璃化转变温度和脆性来自热粘弹性的结果。通过拉曼光谱分析，明确了环氧树脂的玻璃化转变温度与交联度反应有直接关系。当玻璃化转变温度达到饱和时，表征微结构不均匀的脆性降低。玻璃化转变温度饱和的环氧树脂的弹性模量近似为常数。断裂韧性强烈依赖于固化条件。环氧树脂的断裂韧性随环氧树脂含量的增加而增加， ...更多信息 当玻璃化转变温度在约400 K下饱和时，脆性降低。对熔融石英颗粒填充的双酚A型环氧树脂进行了类似的实验。结果表明，复合材料的断裂韧性提高，玻璃化转变温度高，脆性低。因此，玻璃化转变温度和脆性是评价环氧树脂及其复合材料力学性能的有效参数。断裂韧性遵循由热粘弹性决定的时温等效原理。当玻璃化转变温度约为400 K时，脆性较小的试样的断裂韧性比脆性较大的试样的断裂韧性从较低温度到脆塑转变温度时有所提高。最后，基于断裂韧性的时温关系，对含裂纹圆柱体的断裂进行了数学预测，并在发现玻璃化转变温度和脆性对估算力学性能非常有用的基础上，提出了将玻璃化转变温度和脆性作为环氧树脂及其复合材料固化条件设定的参数。少

项目成果

Wakako Araki, Tadaharu Adachi, Akihiko Yamaji: "Fracture Toughnesses of Bisphenol-A Type Epoxy Resin and Silica Particulate-Filled Epoxy Composite"Proceedings of the Intentional Symposium on Experimental Mechanics. D184 (2002)

Wakako Araki、Tadaharu Adachi、Akihiko Yamaji：“双酚 A 型环氧树脂和二氧化硅颗粒填充环氧复合材料的断裂韧性”实验力学意向研讨会论文集。

荒木稚子, 足立忠晴, 蒲生正浩, 山路昭彦: "エポキシ樹脂の破壊靭性値の温度・時間依存性に及ぼす硬化状態の影響"日本機械学会2001年度年次大会講演論文集. No.01-1. 465-466 (2001)

Chiko Araki、Tadaharu Adachi、Masahiro Gamo、Akihiko Yamaji：“固化状态对环氧树脂断裂韧性的温度和时间依赖性的影响”日本机械工程师学会 2001 年年会论文集第 465 期。 -466 (2001)

荒木稚子, 足立忠晴, 蒲生正浩, 山路昭彦: "エポキシ樹脂の破壊靭性値に及ぼす硬化状態の影響"日本機械学会北陸信越支部総会・講演会講演論文集. No.017-1. 251-252 (2001)

Chiko Araki，Tadaharu Adachi，Masahiro Gamo，Akihiko Yamaji：“固化状态对环氧树脂断裂韧性的影响”日本机械工程师学会北陆信越分会会议记录和演讲第017-252号。 (2001)

Tadaharu Adachi, Taro Iketaki, Masahiro Gamou, Akihiko Yamaji: "Time-Temperature Dependence on Fracture Toughness of Silica Particulate-Filled Epoxy Composite"Proceedings of the Fourth International Congress on Thermal Stresses. 65-68 (2001)

Tadaharu Adachi、Taro Iketaki、Masahiro Gamou、Akihiko Yamaji：“二氧化硅颗粒填充环氧复合材料断裂韧性的时间-温度依赖性”第四届国际热应力大会论文集。

Wakako Araki, Tadaharu Adachi, Masahiro Gamou, Akihiko Yamaji: "Time-Temperature Dependence of Fracture Toughness for Bisphenol A Epoxy Resin"Journal of Materials : Design and Applications. 216・2. 79-84 (2002)

Wakako Araki、Tadaharu Adachi、Masahiro Gamou、Akihiko Yamaji：“双酚 A 环氧树脂断裂韧性的时间-温度依赖性”材料杂志：设计与应用 216・2（2002 年）。