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Physical–mechanical properties and morphological study on nylon‐6 recycling by injection molding
Author(s) -
LozanoGonzález Ma. Josefina,
RodriguezHernandez Ma. Teresa,
GonzalezDe Los Santos Eduardo A.,
VillalpandoOlmos Jesus
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000509)76:6<851::aid-app11>3.0.co;2-d
Subject(s) - gel permeation chromatography , elongation , molding (decorative) , materials science , nylon 6 , injection moulding , composite material , nylon 66 , polymer , izod impact strength test , polymer chemistry , optical microscope , scanning electron microscope , ultimate tensile strength , polyamide
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 = 17% and M n = 14%). With the reprocess was also observed the presence of gels. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 851–858, 2000