Polyetherimide/Epoxy thermoplastic/thermoset polymer alloy

• Main Authors: Charng-Shiuan Wang, 王長炫
• Other Authors: Feng-Chih Chang
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/22702317178603945342

碩士 === 國立交通大學 === 應用化學系 === 81 === In the thermoplastic/thermoset polymer alloy of PEI/Epoxy, the content of accelerator in the sytem is able to control the curing rate of the thermoset epoxy. When the curing rate is above a critical level, the thermoplastic PEI resin oringinally dissolved in the pre-cured epoxy monomer is being trapped within the epoxy network and can not diffuse out of the epoxy matrix to form a separate phase, a homogeneous polymer alloy is formed. Inhomegeneous polymer alloy can be formed with PEI separated as spherical particles if the epoxy curing rate is below the critical level. Both types of polymer alloys can improve the epoxy toughness significantly by different toughening mechanisms. The homogeneous polymer alloy fractures by a mechanism similar to the unmodified epoxy except larger crack tip plastic zone during crack initiation. In the phase separated polymer alloy, the PEI particles act as stress concentrators to initiate multiple shear nduced cracks and also function as cracki terminators.