Effect of silicone interlayer on carbon fiber reinforced PMR-15 composite: Processing and characterization

 
 
 
 

Effect of silicone interlayer on carbon fiber reinforced PMR-15 composite: Processing and characterization

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dc.contributor.advisor Ishida, Hatsuo en_US
dc.contributor.author Labronici, Marcos en_US
dc.date.accessioned 2008-07-10T14:16:05Z
dc.date.available 2008-07-10T14:16:05Z
dc.date.created 1994 en_US
dc.date.issued 2008-07-10T14:16:05Z
dc.identifier.uri http://rave.ohiolink.edu/etdc/view?acc_num=case1061308467 en_US
dc.identifier.uri http://hdl.handle.net/2374.OX/16097
dc.description The objective of this work is to study the effect of silicone as an interlayer material in carbon fiber reinforced PMR-15 polyimide composites. Viscous and elastomeric silicones are applied as interlayers to these composites in order to develop a tougher and microcrack resistant composite, while preserving the excellent thermo-oxidative resistance of the PMR-15 polyimide matrix. Carbon fiber is continuously coated with high molecular weight polydimethylsiloxane and polymethylvinylsiloxane (780,000) in hexane. Uncured polydimethylsiloxane (PDMS gum) is the viscous interlayer studied and polydimethylsiloxane (PDMS elastomer) and polymethylvinylsiloxane (PVMS elastomer) cured with peroxides are the two forms of silicone elastomers studied. The effect of the amount and the type of these forms of silicones on the mechanical and dynamic mechanical properties of unidirectional composites are studied. It is shown that the silicone interlayer enhances impact strength, toughness, and microcrack resistance. The enhancement depends on the interlayer thickness, coating process, and laminate fabrication process chosen as well as the type of the silicone. Flexural and interlaminar shear strength is found to drop with the presence of the interlayer. It is demonstrated that the mechanical proper ties of the composites with silicone interlayers is not affected by thermal aging at 300°C for 100 h. The dynamic mechanical properties of the composites are determined and compared with uncoated carbon fiber reinforced PMR-15 polyimide composites. The presence of the interlayers are observed by the appearance of a new relaxation peak in dynamic mechanical spectra. The temperature of this peak is found to be a good indication of the degree of the cure of the silicone elastomer. Apparent activation energy of the α transition of the matrix in the modified composites varies with the amount and type of silicone interlayer in concert with the impact strength. The variation of the activation energy is explained in terms of structural changes within the matrix that arise from interfacial effects due to the presence of the soft interlayer. The main structural change within the matrix is believed to be a decrease in the free volume caused by the relieving of internal stress en_US
dc.format application/pdf en_US
dc.format 253p. en_US
dc.rights unrestricted en_US
dc.rights Copyright and permissions information available at the source archive en_US
dc.subject Silicone interlayer en_US
dc.subject Carbon fiber reinforced PMR-15 composite en_US
dc.title Effect of silicone interlayer on carbon fiber reinforced PMR-15 composite: Processing and characterization en_US
dc.type Electronic Thesis or Dissertation en_US
dc.degree.name PhD en_US
dc.degree.level doctoral en_US
dc.degree.discipline Macromolecular Science en_US
dc.degree.grantor Case Western Reserve University en_US
dc.contributor.publisher Case Western Reserve University / OhioLINK en_US

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