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Abstract
Two new polyphosphazenes, poly(4-maleimidophenoxy/phenoxy)phosphazene and poly(4-phthalimidophenoxy/phenoxy)phosphazene, were prepared and used to toughen a PMR polyimide designated LaRCTMRP46. These toughened polyimides were evaluated as thin films with a 0–40 wt% range of polyphosphazene to polyimide. The structure–property relationships of these inorganic/organic polymeric matrices were studied and evaluated in terms of fracture toughness, thermo-oxidative stability, and thermal, mechanical, and tensile properties. The hybrid systems revealed an increase in fracture toughness up to 20 wt% polyphosphazene load without any substantial loss in tensile properties. With 5 wt% poly(4-phthalimidophenoxy/phenoxy)phosphazene loading, the fracture toughness of the semi-interpenetrating network was increased by 124%. When 10 wt% poly(4- maleimidophenoxy/phenoxy)phosphazene loading was used, the fracture toughness of the grafted copolymer was improved by 217%. In addition, substantial enhancement in thermo-oxidative stability was also observed.
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Affiliation(s)
- O L Abu-Shanab
- Polymers and Coatings Department, North Dakota State University, Fargo, ND 58105, USA
| | - C P Chang
- Composite Research Laboratories, Auburn University, AL 36849, USA
| | - M D Soucek
- Polymers and Coatings Department, North Dakota State University, Fargo, ND 58105, USA
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Soucek MD, Abu-Shanab OL, Anderson CD, Wu S. Kinetic modeling of the crosslinking reaction of cycloaliphatic epoxides with carboxyl functionalized acrylic resins: Hammett treatment of cycloaliphatic epoxides. MACROMOL CHEM PHYS 1998. [DOI: 10.1002/(sici)1521-3935(19980601)199:6<1035::aid-macp1035>3.0.co;2-p] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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