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Physical–mechanical properties and morphological study on nylon-6 recycling by injection molding

✍ Scribed by Ma. Josefina Lozano-González; Ma. Teresa Rodriguez-Hernandez; Eduardo A. Gonzalez-De Los Santos; Jesus Villalpando-Olmos

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
442 KB
Volume
76
Category
Article
ISSN
0021-8995

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✦ Synopsis

The effect of the multiple recycling of nylon-6 by injection molding on its physical-mechanical properties and morphology was studied after each cycle of injection. These studies were made in order to know how many times it is possible to recycle the nylon-6 without significant loss of the physical-mechanical properties. Optical and electronic microscopy were used to evaluated the morphology. Molecular weight changes were determinated by gel permeation chromatography (GPC). The nylon-6 was recycled 10 times, until the eighth cycle the properties of the material did not suffered any change. Changes of 10 -15% in the properties between nylon-6 with 10 cycles of injection and virgin material were observed. An exception was the percentage of elongation that decreased 70% gradually until in the tenth cycle of injection. The results from GPC show that the molecular weight of nylon-6 increased with recycling (M w ϭ 17% and M n ϭ 14%). With the reprocess was also observed the presence of gels.

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