NDLI: Investigation of foaming cell development for epoxy resin with blowing and curing agent by rheological properties

Content Provider	Springer Nature Link
Author	Lee, Seung Hak Song, Hyeong Yong Kim, Dong Gun Lim, Sung Wook Park, Eun Young Hyun, Kyu
Copyright Year	2017
Abstract	The effects of the curing and blowing agent concentration in an epoxy resin were investigated using rheological, mechanical, and optical methods. The curing time from the time sweep test decreased with increasing amount of curing agent at the fixed blowing agent concentration. On the other hand, with increasing blowing agent at a fixed curing agent concentration, the curing time showed a local minimum value. Minimization of the curing time is very useful for reducing the processing time. Axial normal forces as a function of time showed a relationship between the contraction force by the curing process and the expansion force by foaming process. From the axial normal force measurements, it could be categorized quantitatively into three parts: the curing dominant region (negative axial normal force development), transition region, and the foaming dominant region (positive axial normal force development). At the transition region, the axial normal force development was delayed because the foaming process was disturbed by the contraction. Mechanical and structural analysis were conducted for the fully cured and foamed epoxy resin. The completely developed epoxy foams with the high curing agent concentration become brittle. On the other hand, they contained well-distributed unit cell foams inside. This is because the fast curing process interrupts the coalescence of the closed foams. Overall, the optimal curing and blowing agent concentration for the epoxy resin could be determined from rheological analysis during the process and mechanical and structural analysis for fully cured and foamed epoxy resin.
Starting Page	325
Ending Page	334
Page Count	10
File Format	PDF
ISSN	15985032
Journal	Macromolecular Research
Volume Number	25
Issue Number	4
e-ISSN	20927673
Language	English
Publisher	The Polymer Society of Korea
Publisher Date	2017-05-03
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	MIF (Molded-In Foaming) epoxy foam capsulated blowing agent time sweep test curing time axial normal force Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Physical Chemistry Characterization and Evaluation of Materials Nanochemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Materials Chemistry Chemical Engineering Polymers and Plastics

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