NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Comparison of flexural properties of aramid-reinforced pultrusions having varied matrices, pretreatments and postcuresAramid-reinforced composite materials of equal fiber volume and varied polymer thermoset matrices were pultruded and flexurally tested to failure. The objective was to improve the flexural properties of aramid-reinforced pultrusions. Pultrusions of both sized and unsized aramid fiber with four different resin systems were compared to determine the effects of sizing compounds and postcuring on flexural strength, fiber wettability, and fiber-to-resin interface bonding. Improvements in flexural strength resulting from pretreatments with the sizing solutions used were marginal. The most significant improvements in flexural properties resulted from postcuring. Flexural strengths ranged from a low of 39,647 psi (273MPa) to a high of 80,390 psi (554 MPa), an overall increase of 103 percent. The fact that postcuring improved the flexural properties of the pultrusions of the four resin systems indicates that a full cure did not occur in any of the resin systems during the pultrusion process. The increased flexural strengths of the polyester and vinyl ester pultrusions were the most surprising. The four resin systems examined were Interplastic Corporation VE 8300 vinyl ester, Ashland Chemical Company Aropol 7430 Polyester, and Shell Chemical Company Epon 9302 and Epon 9310 epoxides.
Document ID
19870005844
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wilson, Maywood L.
(NASA Langley Research Center Hampton, VA, United States)
Johnson, Gary S.
(NASA Langley Research Center Hampton, VA, United States)
Macconochie, Ian O.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1987
Subject Category
Composite Materials
Report/Patent Number
NAS 1.15:88997
NASA-TM-88997
L-16152
Report Number: NAS 1.15:88997
Report Number: NASA-TM-88997
Report Number: L-16152
Accession Number
87N15277
Funding Number(s)
PROJECT: RTOP 506-51-13-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available