The effect of curative on the fracture toughness of PTMEG/TDI polyurethane elastomers

Beck R.A. and Truss R.W. (1995) The effect of curative on the fracture toughness of PTMEG/TDI polyurethane elastomers. Polymer, 36 4: 767-774. doi:10.1016/0032-3861(95)93106-V


Author Beck R.A.
Truss R.W.
Title The effect of curative on the fracture toughness of PTMEG/TDI polyurethane elastomers
Journal name Polymer   Check publisher's open access policy
ISSN 0032-3861
Publication date 1995
Sub-type Article (original research)
DOI 10.1016/0032-3861(95)93106-V
Volume 36
Issue 4
Start page 767
End page 774
Total pages 8
Subject 1605 Policy and Administration
2507 Polymers and Plastics
Abstract The mechanical properties and fracture behaviour of polyurethanes with two hardness levels have been measured. The polyurethanes were based on polytetramethylene ether glycol (PTMEG) and toluene diisocyanate (TDI) and two different curatives, or chain extenders - methylene-bis-orthochloroaniline (MBOCA) and dimethylthiotoluene diamine (Ethacure E300). The polyurethanes made using MBOCA as the curative were found to have a lower initial modulus and less permanent set than polyurethanes of similar hardness but made using Ethacure E300. Moreover, the Ethacure E300 materials showed crack growth when the strain energy density in the sample was low, and a period of slow stable crack advance. The MBOCA cured material of lower hardness also showed slow crack growth, but crack growth started at much higher strain energy densities than for the Ethacure E300 materials. The harder MBOCA cured material did not show slow crack growth and failed rapidly. The strain energy density to cause fracture was higher than that required to initiate slow crack growth in the other materials. The reasons for the differences in the fracture behaviour are discussed in terms of the structure of the polyurethanes.
Keyword fracture toughness
polyurethanes
structure
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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