Morphology and toughness characterization of epoxy resins modified with amine and carboxyl terminated rubbers

Kunz, S. C.; Sayre, J.A.; Assink, Roger A.

doi:10.1016/0032-3861(82)90215-4

Cited by 240 publications

(111 citation statements)

References 9 publications

Supporting

Mentioning

110

Contrasting

Unclassified

Order By: Relevance

“…However, many epoxies are brittle and have poor fracture toughness, weak impact strength and low resistance to fatigue crack propagation [1]. Epoxies can be toughened by adding rubbery fillers, such as liquid rubbers [2][3][4] and preformed core/shell rubber particles [5][6][7][8]. Rubber cavitation happens under local hydrostatic stress.…”

Section: Introductionmentioning

confidence: 99%

“…The ratio of the rubbery interlayer thickness to the SiO 2 radius of the 20k20k and the 40k40k systems was analyzed based on at least 10 particles from each AFM image using an image processing program ImageJ [20]. The measured values were compared to the ratio calculated using the rubbery block molecular weight, graft density and bulk PHMA density of 1.0007 g/cm 3 . The comparison is summarized in Figure 4.…”

Section: Synthesismentioning

confidence: 99%

See 1 more Smart Citation

The Mechanical Properties of Epoxy Composites Filled with Rubbery Copolymer Grafted SiO2

Gao

Benicewicz

et al. 2012

Polymers

View full text Add to dashboard Cite

This study demonstrated a method for toughening a highly crosslinked anhydride cured DGEBA epoxy using rubbery block copolymer grafted SiO 2 nanoparticles. The particles were synthesized by a sequential reversible addition-fragmentation chain transfer (RAFT) polymerization. The inner rubbery block poly(n-hexyl methacrylate) (PHMA) had a glass transition temperature below room temperature. The outer block poly(glycidyl methacrylate) (PGMA) was matrix compatible. A rubbery interlayer thickness of 100% and 200% of the particle core radius was achieved by grafting a 20 kg/mol and a 40 kg/mol PHMA at a graft density of 0.7 chains/nm 2 from the SiO 2 surface. The 20 kg/mol rubbery interlayer transferred load more efficiently to the SiO 2 cores than the 40 kg/mol rubbery interlayer and maintained the epoxy modulus up to a loading of 10 vol% of the rubbery interlayer. Both systems enabled cavitation or plastic dilatation. Improvement of the strain-to-break and the tensile toughness was found in both systems. We hypothesize that plastic void growth in the matrix is the primary mechanism causing the improvement of the ductility. OPEN ACCESSPolymers 2012, 4 188

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Synthesismentioning

confidence: 99%

The Mechanical Properties of Epoxy Composites Filled with Rubbery Copolymer Grafted SiO2

Gao

Benicewicz

et al. 2012

Polymers

View full text Add to dashboard Cite

show abstract

“…Although CTBN and ATBN oligomers are very efficient in improving the fracture properties of epoxy resins but make the resultant material thermally unstable. To avoid deterioration in the inherent stiffness and strength and a reduction in the glass-transition temperature of the resin, some engineering plastics, such as poly ether sulphone (PES) [7] and poly ether imide [8,9] have been used to produce systems containing rigid, ductile particles dispersed in epoxy resin. Particles of crystalline polymers, such as poly vinylidene fluoride (PVDF), poly butylenes terephthalate (PBT) and nylon 6 has been used for the toughening of an aromatic amine cured epoxy resin.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Thermal Properties of Chemically Modified Epoxy Resin

Ikram¹,

Munir²

2012

OJSTA

View full text Add to dashboard Cite

Diglycidyl ether of bisphenol-A (DGEBA), having number average molecular weight (M n ) 375, was modified by incorporating the hydroxyl terminated polybutadiene (HTPB) based prepolymer using isophorone diisocyanate as a coupling agent. To increase the compatibility between the epoxy resin and HTPB part, polar groups were introduced in the later to achieve physical and chemical interactions between the two phases. The finally modified DGEBA system was cured with amine based hardener. FTIR and 1 H-NMR were used to monitor the whole modification procedure. The rubber particles size and distribution was monitored as a function of HTPB contents in the resin system using scanning electron microscopy (SEM). The mechanical, thermal and thermo-mechanical properties have shown that the tensile strength, toughness, ductility and impact strength of the modified cured system have been successfully increased at some optimum HTPB contents without affecting the inherent thermal and thermo-mechanical stability associated with DGEBA resin system. Some of the mechanical properties like flexural modulus, tensile modulus and compressive strength decreased with increasing rubber contents.

show abstract

“…Approaches to enhance the adhesive and mechanical strength of the final products have included the addition of particulate fillers, [1][2][3] reactive liquid rubbers, [4][5][6][7][8][9][10] and thermoplastic polymers. [11][12][13][14][15] Epoxy resin's properties have also been improved by using nanoparticles [16][17][18][19][20] as well as other cross-linkable polymers to form full-or semi-interpenetrating polymer networks.…”

Section: Introductionmentioning

confidence: 99%

Preparation and property evaluation of nanocomposites based on polyurethane‐modified epoxy/montmorillonite systems

Bakar¹,

Kostrzewa²,

Hausnerová³

et al. 2010

Adv Polym Technol

View full text Add to dashboard Cite

Montmorillonite nanoclay and polyurethanes obtained from polyethylene glycol (PUR 400) and polyoxypropylene diol (PUR 1002) were used to enhance the mechanical properties of an epoxy resin. Maximum impact strength improvement was obtained with compositions containing 2% nanoclay and 10% PUR 400 as well as that with 1% nanoclay and 15% PUR 400, corresponding to 110% and 75%, respectively, in relation to the unmodified epoxy resin. Moreover, a 10-fold increase was observed with respect to the flexural strain at break for the composition containing 15% PUR 1002 and 2% nanoclay.

show abstract

Morphology and toughness characterization of epoxy resins modified with amine and carboxyl terminated rubbers

Cited by 240 publications

References 9 publications

The Mechanical Properties of Epoxy Composites Filled with Rubbery Copolymer Grafted SiO2

The Mechanical Properties of Epoxy Composites Filled with Rubbery Copolymer Grafted SiO2

Mechanical and Thermal Properties of Chemically Modified Epoxy Resin

Preparation and property evaluation of nanocomposites based on polyurethane‐modified epoxy/montmorillonite systems

Contact Info

Product

Resources

About