MISCIBILITY AND CURE KINETICS STUDIES ON BLENDS OF BISPHENOL-A POLYCARBONATE AND TETRAGLYCIDYL-4,4'-DIAMINODIPHENYLMETHANE EPOXY CURED WITH AN AMINE
MISCIBILITY AND CURE KINETICS STUDIES ON BLENDS OF BISPHENOL-A POLYCARBONATE AND TETRAGLYCIDYL-4,4'-DIAMINODIPHENYLMETHANE EPOXY CURED WITH AN AMINE
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DOI：
10.1002/polb.1995.090331608
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发表时间：
1995-11-30
影响因子：
--
通讯作者：
WOO, EM
中科院分区：
文献类型：
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作者：
SU, CC;KUO, JF;WOO, EM
用差示扫描量热法(DSC)研究了双酚A聚碳酸酯(PC)与4，4‘-二氨基二苯基砜(DDS)固化的四官能环氧树脂(TGDDM)共混物的玻璃化转变行为。这些共混物在整个组成范围内表现出罕见的混相性。此外，用扫描电子显微镜(SEM)观察了共混物的形态，发现在所有组成的共混物中都存在均一的单相PC/环氧网络。此外，还发现聚碳酸酯的加入对环氧共混物的固化行为有明显的影响。由于PC的存在，环氧-PC共混物的固化反应速率显著提高。此外，环氧共混物的固化机理不再是自催化。用DSC研究了DDS固化的环氧树脂与不同组成的PC共混物的n=1.2~1.5的n级反应机理。提出的n级动力学模型可以很好地描述到玻璃化点的环氧树脂/PC共混物的固化行为。(C)1995 John Wiley&Sons，Inc.
Differential scanning calorimetry (DSC) has been applied to characterize the glass transition behavior of the blends formed by bisphenol-A polycarbonate (PC) with a tetrafunctional epoxy (tetraglycidyl-4,4'-diaminodiphenyl methane, TGDDM) cured with 4,4'-diaminodiphenylsulphone (DDS). A rare miscibility in the complete composition range has been demonstrated in these blends. Additionally, the blend morphology was examined using scanning electron microscopy (SEM) and a homogeneous single-phase PC/epoxy network has been observed in the blends of all compositions. Moreover, polycarbonate incorporation has been found to exert a distinct effect on the cure behavior of the epoxy blends. The cure reaction rates for the epoxy-PC blends were significantly higher due to the presence of PC. In addition, the cure mechanism of the epoxy blends was no longer autocatalytic. An n-th order reaction mechanism with n = 1.2 to 1.5 has been observed for the blends of DDS-cured epoxy with PC of various compositions studied using DSC. The proposed n-th order kinetic model has been found to describe well the cure behavior of the epoxy/PC blends up to the vitrification point. (C) 1995 John Wiley & Sons, Inc.