Use of Titanate Coupling Agents in Kevlar (trade name)/Phenolic Composites

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Abstract:

Surface modification of KevlarR fibers with titanate coupling agents for improved adhesion of the fiber and resin in KevlarRphenolic composites has been attempted to explore the possibility of enhancement in adhesion and bulk properties of composites for friction materials. Titanate coupling agents were used and flexural properties of the KevlarR-fiber reinforced composites determined. A study of different amounts of the coupling agents at the fiber-matrix interface suggested that 2 by weight of fiber was the optimum amount, in terms of improvement in flexural properties. The composite samples with the coupling agents, showed an increase in flexural strength, over the untreated samples with the maximum increase being approx. 18 over the control. Water absorption studies were conducted on KevlarRphenolic composites treated with organotitanates to determine the effectiveness of these coupling agents in improving resistance to moisture attack. The treated KevlarRphenolic composite samples exhibited greater resistance to moisture- ingress over the untreated samples. The control samples showed a decrease of 17 in flexural strength. The largest decrease in strength was 14 for the treated samples containing coupling agent tetrakis2-ethylhexyltitanate TYZOR TOT. Recovery in strength on reconditioning, was also greater for treated samples over control. A recovery in strength of ca. 94 was seen for some treated samples. Coupling agents, Composites, Kevlar, Interfaces, Mechanical properties.

Author(s):
Menon, Nalini ; Blum, Frank D. ; Dharani, Lokesh R.
Author Organization(s):
MISSOURI UNIV-ROLLA DEPT OF CHEMISTRY
Descriptive Note:
Technical rept. 1 Jan 1993-1 Apr 1994
Pagination:
0028

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
UMR-FDB-37
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_5.3_Planning; JCA_5_Command and Control; JCA_6.4.1_Secure Information Exchange; JCA_1_Force Support; JCA_6_Net Centric; JCA_1.2_Force Preparation; JCA_3.2_Engagement; JCA_3_Force Application; JCA_1.2.3_Educating; JCA_6.3.3_Spectrum Management; JCA_6.4_Information Assurance; JCA_8_Building Partnerships
Communities of Interest:
Advanced Electronics
Descriptor(s):
*COMPOSITE MATERIALS, *FIBER REINFORCED COMPOSITES, *TITANATES, *COUPLINGS, CONTROL, FIBERS, MECHANICAL PROPERTIES, RECOVERY, ATTACK, POLYAMIDE PLASTICS, SURFACES, FLEXURAL PROPERTIES, PLASTICS, FRICTION, MOISTURE, ABSORPTION, WEIGHT, FLEXURAL STRENGTH, AUGMENTATION, ADHESION, RESISTANCE, INTERFACES, MODIFICATION, WATER, MATERIALS
Field(s)/Group(s):
Inorganic Chemistry, Organic Chemistry, Laminates and Composite Materials, Mechanics
Keyword(s):
*KEVLAR(R), *PHENOLIC COMPOSITES
Report Date:
1994 Apr 02