Preparation of Polyhexamethyleneadipamide Prepolymer by a Low-Temperature Process

Papaspyrides, CD; Vouyiouka, SN; Bletsos, IV

dc.contributor.author	Papaspyrides, CD	en
dc.contributor.author	Vouyiouka, SN	en
dc.contributor.author	Bletsos, IV	en
dc.date.accessioned	2014-03-01T01:21:15Z
dc.date.available	2014-03-01T01:21:15Z
dc.date.issued	2004	en
dc.identifier.issn	0021-8995	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16158
dc.subject	Nylon®6,6	en
dc.subject	Polyamides	en
dc.subject	Solid-state polymerization	en
dc.subject	Transition	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Hygroscopicity	en
dc.subject.other	Solid-state polymerization	en
dc.subject.other	Transition	en
dc.subject.other	Agglomeration	en
dc.subject.other	Molecular weight	en
dc.subject.other	Oligomers	en
dc.subject.other	Organic acids	en
dc.subject.other	Polymerization	en
dc.subject.other	Pyrolysis	en
dc.subject.other	Stoichiometry	en
dc.subject.other	Nylon polymers	en
dc.subject.other	polymer	en
dc.title	Preparation of Polyhexamethyleneadipamide Prepolymer by a Low-Temperature Process	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/app.13704	en
heal.identifier.secondary	http://dx.doi.org/10.1002/app.13704	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	The polyhexamethyleneadipamide (PA 6,6) prepolymer is prepared starting from dry hexamethylenediammonium adipate (PA 6,6 salt) by a low-temperature polyamidation technique, which ensures balanced and free-of-thermal-degradation products. The operating temperature is chosen in the vicinity of the melting point of the polyamide salt, to avoid thermal decomposition, which accompanies the higher temperatures of the conventional polyamidation processes. Two stages of prepolymerization are suggested: First, the reaction is carried out under autogenous conditions (pressurized system) to or beyond the point where diamine ends have reacted; hereafter, the system is vented so as to remove the produced water and to drive the condensation reaction toward a higher degree of polymerization. The process is demonstrated using both shaker tubes and a modified, intensively stirred autoclave. The products have balanced ends and no detectable thermal degradation effects and are used as a starting material for solid-state finishing toward high molecular weight polyamides. (C) 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 301-306, 2004.	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	Journal of Applied Polymer Science	en
dc.identifier.doi	10.1002/app.13704	en
dc.identifier.isi	ISI:000189150900039	en
dc.identifier.volume	92	en
dc.identifier.issue	1	en
dc.identifier.spage	301	en
dc.identifier.epage	306	en