Studies on Thermal, Mechanical and Morphological Behaviour of Caprolactam Blocked Methylenediphenyl Diisocyanate and Bismaleimide Modified Epoxy Matrices

The perspectives of using new modified polymer-based materials for the restoration of vehicle parts are substantiated in this article. The use of binders based on epoxy diane oligomers is proved to be promising in the formation of anti-corrosion coatings. To improve the properties of epoxy matrices at the preliminary stage of their formation, active additives are introduced. The use of a phthalimide modifier, which contains functional groups active before interfacial interaction, is proved to be promising as well. An epoxy diane oligomer is selected as the binder‘s main component in the formation of composites. The hardener polyethylene polyamine is used for crosslinking the epoxy compositions. It allows to harden materials at room temperatures. The choice of a phthalimide modifier for the improvement of thermophysical properties of the developed materials is substanciated. Heat resistance (according to Martens), glass transition temperature and thermal coefficient of linear expansion of modified epoxy composites are studied. To form a composite material or protective coating with improved thermophysical properties, the modifier phthalimide in the amount of q = 0.25… 0.50 pts. wt. at q = 100 pts. wt. of epoxy oligomer ED-20 should be introduced into the epoxy binder. Based on the tests of thermophysical properties of phthalimide-modified materials, the allowable temperature limits, at which it is possible to use the developed composites, are found.

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Thermal and mechanical properties of epoxidized natural rubber modified epoxy matrices

Polymer International ◽

10.1002/(sici)1097-0126(199909)48:9<889::aid-pi227>3.0.co;2-l ◽

1999 ◽

Vol 48 (9) ◽

pp. 889-895 ◽

Cited By ~ 15

Author(s):

J C Cizravi ◽

K Subramaniam

Keyword(s):

Mechanical Properties ◽

Natural Rubber ◽

Epoxidized Natural Rubber ◽

Thermal And Mechanical Properties ◽

Epoxy Matrices ◽

Modified Epoxy

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Mechanical characterization of woven carbon fiber composites with poly(methyl methacrylate)-modified epoxy matrices

Polymer Composites ◽

10.1002/pc.10059 ◽

2003 ◽

Vol 24 (5) ◽

pp. 640-654 ◽

Cited By ~ 1

Author(s):

B. Fernández ◽

F. Mujika ◽

A. De Benito ◽

I. Mondragon

Keyword(s):

Carbon Fiber ◽

Methyl Methacrylate ◽

Mechanical Characterization ◽

Fiber Composites ◽

Carbon Fiber Composites ◽

Poly Methyl Methacrylate ◽

Epoxy Matrices ◽

Modified Epoxy

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In-Situ Phase Separation of an Amine-Terminated Siloxane in Epoxy Matrices

MRS Proceedings ◽

10.1557/proc-274-31 ◽

1992 ◽

Vol 274 ◽

Cited By ~ 2

Author(s):

D. F. Bergstrom ◽

G. T. Burns ◽

G. T. Decker ◽

R. L. Durall ◽

D. Fryrear ◽

...

Keyword(s):

Phase Separation ◽

Flexural Modulus ◽

Silicone Resin ◽

Elemental Distribution ◽

Pull Out ◽

Epoxy Curing ◽

Distribution Mapping ◽

Epoxy Matrices ◽

Modified Epoxy

ABSTRACTWe have developed an amino-functional silicone resin to toughen epoxies which, when prereacted with the epoxy function in resins, undergoes in-situ phase separation during final epoxy curing. SEM analyses of the morphology of fracture surfaces of MY720- DDS, Epon 828-DDS and other epoxy matrices modified with the silicone resin showed rough surfaces with the formation of very uniform <10 μm spheres. Silicon and sulfur elemental distribution mapping showed silicon rich spheres embedded in an epoxy matrix. We report cavitation, particle debonding and pull-out, and an increases in fracture surface area as possible modes of toughening. Silicone modified materials give improvements in slow strain rate G1c fracture toughness measurements of 250–400%, similar to carboxy terminated polybutadiene-acrylonitrile copolymer (CTBN) modifiers, but with a much smaller flexural modulus loss. The Tg of the modified epoxy matrices are maintained, moisture resistance is improved, and flammability is reduced.

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