Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Optimization of the interface/interphase of carbon fiber/PPS thermoplastic composites using BTDA/DDS poly(amic acid)

Full text
Author(s):
Liliana B. Nohara [1] ; Aparecida M. Kawamoto [2] ; Evandro L. Nohara [3] ; Mirabel C. Rezende [4]
Total Authors: 4
Affiliation:
[1] CTA. IAE. Divisão de Materiais
[2] CTA. IAE. Divisão de Química
[3] UNITAU. Departamento de Engenharia Mecânica
[4] CTA. IAE. Divisão de Materiais
Total Affiliations: 4
Document type: Journal article
Source: POLIMEROS-CIENCIA E TECNOLOGIA; v. 17, n. 3, p. 180-187, 2007-09-00.
Abstract

In the present work two different manufacturing techniques of thermoplastic composites are investigated: the conventional hot compression molding and the aqueous suspension prepregging. The first one involves the impregnation of the reinforcement with molten polymer; while the second one uses aqueous polymeric suspensions, where the reinforcement impregnation occurs by its contact with the particle aqueous suspension of a polymeric matrix. This technique combines the powder polymeric matrix with another polymer which forms the suspension, a poly(amic acid - PAA). In this technique, both polymers are deposited simultaneously on the reinforcement during the impregnation. In a second phase of the processing, the PAA is thermally converted in a polyimide (PI) that can form an interphase region between the reinforcement and the polymer matrix. The objective of this study is the synthesis and the characterization of a PAA, based on BTDA/DDS, and the evaluation of its influence on the interphase region in the poly(phenilene sulphite) (PPS)/carbon fiber composite. DSC and TG results show the success of the PAA synthesis and its conversion into PI, which exhibits thermal stability up to 396 °C. The processed composite by polymeric aqueous suspension showed interlaminar shear strength (56.3 MPa) 12.6% higher than the composite obtained by conventional hot compression molding (50.0 MPa). Fracture surface analyses confirm these results, showing that the use of PAA improves the PPS/carbon fiber interphase. (AU)