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首页> 外文学位 >Characterization of cure kinetics and physical properties of a high performance, glass fiber-reinforced epoxy prepreg and a novel fluorine-modified, amine-cured commercial epoxy.
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Characterization of cure kinetics and physical properties of a high performance, glass fiber-reinforced epoxy prepreg and a novel fluorine-modified, amine-cured commercial epoxy.

机译：高性能玻璃纤维增​​强的环氧预浸料和新型的氟改性，胺固化的市售环氧树脂的固化动力学和物理性质的表征。

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摘要

Kinetic equation parameters for the curing reaction of a commercial glass fiber reinforced high performance epoxy prepreg composed of the tetrafunctional epoxy tetraglycidyl 4,4-diaminodiphenyl methane (TGDDM), the tetrafunctional amine curing agent 4,4′-diaminodiphenylsulfone (DDS) and an ionic initiator/accelerator, are determined by various thermal analysis techniques and the results compared. The reaction is monitored by heat generated determined by differential scanning calorimetry (DSC) and by high speed DSC when the reaction rate is high. The changes in physical properties indicating increasing conversion are followed by shifts in glass transition temperature determined by DSC, temperature-modulated DSC (TMDSC), step scan DSC and high speed DSC, thermomechanical (TMA) and dynamic mechanical (DMA) analysis and thermally stimulated depolarization (TSD). Changes in viscosity, also indicative of degree of conversion, are monitored by DMA. Thermal stability as a function of degree of cure is monitored by thermogravimetric analysis (TGA). The parameters of the general kinetic equations, including activation energy and rate constant, are explained and used to compare results of various techniques. The utilities of the kinetic descriptions are demonstrated in the construction of a useful time-temperature-transformation (TTT) diagram and a continuous heating transformation (CHT) diagram for rapid determination of processing parameters in the processing of prepregs. Shrinkage due to both resin consolidation and fiber rearrangement is measured as the linear expansion of the piston on a quartz dilatometry cell using TMA. The shrinkage of prepregs was determined to depend on the curing temperature, pressure applied and the fiber orientation. Chemical modification of an epoxy was done by mixing a fluorinated aromatic amine (aniline) with a standard aliphatic amine as a curing agent for a commercial Diglycidylether of Bisphenol-A (DGEBA) epoxy. The resulting cured network was tested for wear resistance using tribological techniques. Of the six anilines, 3-fluoroaniline and 4-fluoroaniline were determined to have lower wear than the unmodified epoxy, while the others showed much higher wear rates.
机译：由四官能环氧四缩水甘油基4,4-二氨基二苯甲烷（TGDDM），四官能胺固化剂4,4 '-组成的商用玻璃纤维增​​强高性能环氧预浸料的固化反应动力学方程参数通过各种热分析技术确定二氨基二苯砜（DDS）和离子引发剂/促进剂，并比较结果。当反应速率高时，通过由差示扫描量热法（DSC）确定的产生的热量和通过高速DSC来监测反应。物理性质的变化表明转化率的提高，随后是由DSC，温度调制DSC（TMDSC），步进扫描DSC和高速DSC，热机械（TMA）和动态机械（DMA）分析以及热激发确定的玻璃化转变温度的变化去极化（TSD）。粘度变化（也表示转化程度）由DMA监控。通过热重分析（TGA）监控热稳定性与固化度的关系。解释了一般动力学方程的参数，包括活化能和速率常数，并将其用于比较各种技术的结果。动力学描述的实用性在构造有用的时间-温度-转变（TTT）图和连续加热转变（CHT）图时得到了证明，以快速确定预浸料的加工过程中的加工参数。由于树脂固结和纤维重排引起的收缩率是使用TMA在石英膨胀计单元上的活塞线性膨胀测量的。测定预浸料的收缩率取决于固化温度，施加的压力和纤维取向。通过将氟化芳族胺（苯胺）与作为双酚A（DGEBA）环氧树脂的商用二缩水甘油醚的固化剂的标准脂族胺混合，可以对环氧树脂进行化学改性。使用摩擦学技术测试所得的固化网络的耐磨性。在这六种苯胺中，确定3-氟苯胺和4-氟苯胺的磨损要比未改性的环氧树脂低，而其他苯胺的磨损率要高得多。

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