Effect of the fold surface of the lamellae on the behavior of the trapped radicals in irradiated Polyamide-1010

• Published in: Journal of applied polymer science Vol. 67; no. 7; pp. 1335 - 1339
• Main Authors: Yu, Jiayan, Li, Baozhong, Zhang, Lihua
• Format: Journal Article
• Language: English
• Published: New York John Wiley & Sons, Inc 14.02.1998; Wiley
• Subjects: Applied sciences; Composites; ESR; Exact sciences and technology; fold surface area of the lamellae; Forms of application and semi-finished materials; free radicals; polyamide-1010; Polymer industry, paints, wood; radical transformation; Technology of polymers; Structure effect; Nylon; Temperature effect; Neodymium III Oxides; Semicrystalline polymer; Experimental study; Composite material; Gamma irradiation; Organic free radical; Aliphatic polymer; Concentration effect; Chemical decomposition; Macroradical; Phase partition
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/(SICI)1097-4628(19980214)67:7<1335::AID-APP24>3.0.CO;2-Z

Two types of macromolecular free radicals —CH2CONHĊHCH2— (a) and —CH2Ċ=O (b) trapped in irradiated Polyamide‐1010 (PA1010) and PA1010 filled with neodymium oxide (Nd2O3) were characterized by an ESR approach. It was found out that a was mainly trapped in the fold surface of the lamellae and b in the amorphous phase. This result suggested that trapped radicals mainly existed in the noncrystalline phases. The effect of the fold surface area of the lamellae on the behavior of the trapped radicals are discussed in this article. Whether for the specimens with similar crystallinities but different crystallite sizes or for those with the same concentration of neodymium oxide but different crystallinities, radical a exists dominantly in a specimen with a larger fold surface area of the lamellae. Under a certain circumstance, radical a can transform into radical b for a specimen with a larger fold surface area of the lamellae. It means that the fold surface area of the lamellae plays an important role in the transformation of radical a to b. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1335–1339, 1998