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Effects of acid dyes on crystallization and mechanical properties of melt-reprocessed nylon 66

✍ Scribed by Weiping Lin; Yasser Gowayed

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
278 KB
Volume
74
Category
Article
ISSN
0021-8995

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✦ Synopsis

Nylon fibers dyed with different types of acid dyes were melt reprocessed using a compression-molding machine. The crystalline structure and mechanical properties of the melt-reprocessed nylon were experimentally evaluated. It was found that metal complex acid dyes showed much more distinct effects on the structure and mechanical properties of melt-reprocessed nylon than nonmetallized acid dyes. They decreased the crystallization rate of the molten nylon and reduced its crystallinity. They also reduced the imperfect form I structure in the crystalline region. Compressionmolded nylon samples showed inferior mechanical properties in the presence of metal complex acid dyes. The coordinate bonds between the Cr 3Ο© ions and amide groups are possibly formed in melt-reprocessed nylon, which could be the reason for the changes in the structure and properties of melt-reprocessed nylon.

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