Modification of high ortho novolac resin with diacids to improve its mechanical properties


Iyim T. B.

JOURNAL OF APPLIED POLYMER SCIENCE, cilt.106, ss.46-52, 2007 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 106 Konu: 1
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1002/app.26628
  • Dergi Adı: JOURNAL OF APPLIED POLYMER SCIENCE
  • Sayfa Sayısı: ss.46-52

Özet

To improve the brittleness of high ortho novolac resins, at first, high ortho novolac resins (N) were synthesized and condensation reactions between N and flexible diacids such as adipic acid (DA4) and azelaic acid (DA7) were carried out with different amounts of diacids, in the presence of zinc acetate as catalyst, in toluene as solvent. To characterize the diacid-modified resins (MN), FTIR analysis, TGA and DSC techniques were used. The morphologies of MN were also investigated. Moldings were prepared from the mixture of MN, fillers, and curing agent hexamethylenetetramine. Mechanical properties of these moldings were also determined. The results showed that high ortho novolac resin was toughened by the incorporation of flexible diacids in the polymer backbone and these modified resins can be used as a matrix resin of composite materials. (c) 2007 Wiley Periodicals, Inc.

To improve the brittleness of high ortho

novolac resins, at first, high ortho novolac resins (N) were

synthesized and condensation reactions between N and

flexible diacids such as adipic acid (DA4) and azelaic acid

(DA7) were carried out with different amounts of diacids,

in the presence of zinc acetate as catalyst, in toluene as solvent.

To characterize the diacid-modified resins (MN), FTIR

analysis, TGA and DSC techniques were used. The morphologies

of MN were also investigated. Moldings were

prepared from the mixture of MN, fillers, and curing agent

hexamethylenetetramine. Mechanical properties of these

moldings were also determined. The results showed that

high ortho novolac resin was toughened by the incorporation

of flexible diacids in the polymer backbone and these

modified resins can be used as a matrix resin of composite

materials.