Abstract
The internal stresses of modified epoxy resins with 4–24 phr of polyester were measured by the steel ring method. The shear moduli and dynamic viscositiy of the cured epoxy resins were tested by dynamic mechanical analysis. A scanning electric microscope was used to observe the morphologies of the fracture surface of the cured epoxy resins. The results showed that the internal stress of cured epoxy resins greatly depended on the addition of polyester and the minimum value of internal stress emerged with the addition of 16 phr polyester with no sacrifice of mechanical properties and heat-resistance. The internal stress of cured resins was almost absent during the curing period and was less from the curing temperature to the glass transition temperature and drastically increased from near the glass transition temperature to room temperature.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
