当前位置: X-MOL 学术J. Compos. Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Creep behavior of polyetherimide semipreg and epoxy prepreg composites: Structure vs. property relationship
Journal of Composite Materials ( IF 2.9 ) Pub Date : 2020-05-22 , DOI: 10.1177/0021998320927774
Ana Karoline dos Reis 1 , Francisco Maciel Monticelli 1 , Roberta Motta Neves 2 , Luis Felipe de Paula Santos 1 , Edson Cocchieri Botelho 1 , Heitor Luiz Ornaghi Jr 1
Affiliation  

In the present study, the creep behavior of polyetherimide semipreg and epoxy prepreg composites was studied using dynamic mechanical analyzer and focused on structure vs. property relationships in glassy, glass transition, and elastomeric regions. The main contribution to the field is to study pre-impregnated materials concerning creep behavior, mainly based on different analytical models, and microstructure. Two different reinforcements were used (carbon fiber and glass fiber) for each matrix. Findley, Burger, and Weibull analytical models were applied with an excellent fit for the most of them. The impregnation quality, verified by C-scan and the void content by acid digestion, shows different impregnation behaviors, mainly for epoxy/CF, which also influenced molecular motion behavior. The creep behavior was mainly influenced by matrix type than reinforcement architecture and void content. In addition, the creep was higher for epoxy in the glassy region; however, in the glass transition region, higher deformation was found for polyetherimide composites. Previous behavior is mainly attributed to higher energy storage in the glassy region which plays a significant role in the dissipation (glass transition energy), resulting in the energy loss or the drop of storage modulus in a narrow temperature range – more abrupt. This behavior was corroborated by time-temperature superposition curves in which the low deformation obtained for polyetherimide composites at low temperatures is maintained only until the glass transition temperature. Epoxy composites showed a higher initial creep deformation, but the values were almost constant with temperature, even when the temperature passes by the glass transition temperature.

中文翻译:

聚醚酰亚胺半浸料和环氧预浸料复合材料的蠕变行为:结构与性能关系

在本研究中,聚醚酰亚胺半浸料和环氧预浸料复合材料的蠕变行为使用动态力学分析仪进行了研究,重点关注玻璃态、玻璃化转变和弹性体区域的结构与性能关系。该领域的主要贡献是研究有关蠕变行为的预浸材料,主要基于不同的分析模型和微观结构。每种基体使用了两种不同的增强材料(碳纤维和玻璃纤维)。Findley、Burger 和 Weibull 分析模型适用于其中的大多数模型。C-scan 验证的浸渍质量和酸消化的空隙含量显示出不同的浸渍行为,主要是环氧树脂/CF,这也影响了分子运动行为。蠕变行为主要受基体类型而不是增强结构和空隙含量的影响。此外,环氧树脂在玻璃态区域的蠕变更高;然而,在玻璃化转变区域,聚醚酰亚胺复合材料的变形更大。先前的行为主要归因于在耗散(玻璃化转变能)中起重要作用的玻璃态区域中更高的能量储存,导致能量损失或储能模量在较窄的温​​度范围内下降——更突然。时间-温度叠加曲线证实了这种行为,其中聚醚酰亚胺复合材料在低温下获得的低变形仅保持到玻璃化转变温度。环氧复合材料表现出较高的初始蠕变变形,
更新日期:2020-05-22
down
wechat
bug