Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 122, Issue 3, Pages 1722-1730Publisher
WILEY-BLACKWELL
DOI: 10.1002/app.34070
Keywords
resins; polyurethanes; mechanical properties; interpenetrating polymer networks (IPN); composites
Categories
Funding
- Ministry of Education, Youth and Sports of the Czech Republic [MSM 7088352101]
Ask authors/readers for more resources
Polyurethanes obtained from 4,4'-diphenylmethane diisocyanate (MDI) and polydiols with different molecular weights (polyethylene glycol and polyoxypropylene diols) were used as modifiers for diglycidyl ether of bisphenol A. Impact strength (IS), critical stress intensity factor (KC), flexural strength and flexural strain at break were measured as a function of polyurethane (PUR) type and content. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and infrared spectroscopy (FTIR) were employed for the structure and morphology analysis. It was found that the addition of polyurethane with an excess of isocyanate groups to epoxy resin resulted in the formation of a grafted interpenetrating polymer network structure. The mechanical properties of epoxy resin were improved with 5 and 10% PUR. Moreover, it was observed that composites containing PUR based on higher molecular weight (PUR 1002 and PUR 2002) with long flexible segments exhibited higher impact strength while PUR prepared from polyethylene glycol had a higher flexural energy to break and a higher flexural modulus. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 1722-1730, 2011
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available