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Effect of resin pH on creep behaviour of cured phenol formaldehyde resins

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Abstract

Seven different types of phenol formaldehyde (PF) resins samples with five different pH values were used in order to investigate the effects of resin pH on the creep behaviour of cured PF resins. The results suggest that the effect of resin pH value on the creep behaviour of PF resins is significant. Alkali presence increases the hygroscopicity and enhances time dependent creep of PF resins due to the plasticisation of adhesive. The PF resins with a high pH have great potential to develop delayed elastic creep. The acidified resins also develop greater creep rate. Resols reacted under acidic conditions may form linear linkages. These structural changes in cured resins will increase the flexibility of these resins, and thus, enhance the creep rate and therefore improve stress relaxation in glue lines.

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Authors and Affiliations

  1. Key Laboratory of Bio-based Materials Science and Technology of Ministry of Education, College of Materials Science and Engineering, Northeast Forestry University, Harbin, 150040, China

    Wang Feng-hu  (王逢瑚) & Hu Ying-cheng  (胡英成)

Authors
  1. Wang Feng-hu  (王逢瑚)
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  2. Hu Ying-cheng  (胡英成)
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Corresponding author

Correspondence to Wang Feng-hu  (王逢瑚).

Additional information

Foundation item: Project (03602) supported by the Key Scientific Research Foundation of Ministry of Education, China

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Wang, Fh., Hu, Yc. Effect of resin pH on creep behaviour of cured phenol formaldehyde resins. J Cent. South Univ. Technol. 14 (Suppl 1), 306–309 (2007). https://doi.org/10.1007/s11771-007-0270-2

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  • DOI: https://doi.org/10.1007/s11771-007-0270-2

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