Chemistry of novolac resins. II. Reaction of model phenols with hexamethylenetetramine

✍ Scribed by Timothy R. Dargaville; Pauline J. De Bruyn; Audrey S. C. Lim; Mark G. Looney; Alan C. Potter; David H. Solomon; Xiaoqing Zhang

• Book ID: 101269216
• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 222 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(199706)35:8<1389::aid-pola7>3.0.co;2-v

✦ Synopsis

It is proposed that the reactions of hexamethylenetetramine (HMTA) with 2,4-xylenol and with 2,6-xylenol occur by different pathways. The rate of reaction and the final product distribution depend on the initial xylenol : HMTA ratio and are different in the two systems. Measured by HMTA consumption, with 2,4-xylenol the reaction rate increased with increasing xylenol : HMTA ratios, whereas with 2,6-xylenol the rate of reaction decreased with increasing 2,6-xylenol : HMTA ratio. In systems which contain both 2,4-and 2,6-xylenol, a strong preference for reaction of the HMTA with the ortho site of 2,4-xylenol was noted. This preference was apparent even in mixtures in which 2,6-xylenol was present in greater amounts than 2,4-xylenol. ᭧ 1997