Irreversible structural changes during PET recycling by extrusion

被引：78

作者：

Assadi, R ^{[1
]}

Colin, X ^{[1
]}

Verdu, J ^{[1
]}

机构：

[1] Ecole Natl Super Arts & Metiers, LTVP, F-75013 Paris, France

来源：

POLYMER | 2004年 / 45卷 / 13期

关键词：

poly(ethylene terephthalate); recycling; crosslinking;

D O I：

10.1016/j.polymer.2004.04.029

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Steric exclusion chromatography (SEC) and rheometry were used to study irreversible structural changes occurring during poly(ethylene terephthalate) (PET) extrusion. It appeared that polymer gelation could occur after three successive extrusions, showing the existence of a crosslinking process. This latter occurs only in the presence of oxygen at low oxygen pressures (typically P-O2 < 9 x 10(3) Pa) as a result of coupling of alkyl radicals generated by the oxidation chain process. A kinetic model based on this assumption but taking also into account chemical reactions occurring in nitrogen, generates kinetic curves of melt (Newtonian) viscosity changes in good agreement with experimental ones. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：4403 / 4412

页数：10

共 18 条

[1]

AGASSANT JF, 1996, MISE FORME MAT PLAST, pR22

[2]

ASSADI R, 2002, RECYCLAGE POLYTEREPH

[3] VISCOSITY OF POLYMERS IN CONCENTRATED SOLUTION [J].

BUECHE, F .

JOURNAL OF CHEMICAL PHYSICS, 1956, 25 (03) :599-600

[4] About a quasi-universal character of unstabilised polyethylene thermal oxidation kinetics [J].

Colin, X ;

Fayolle, B ;

Audouin, L ;

Verdu, J .

POLYMER DEGRADATION AND STABILITY, 2003, 80 (01) :67-74

[5]

CRANK J, 1968, DIFFUSION POLYM, P46

[6]

Emanuel N., 1987, CHEM PHYS POLYM DEGR

[7] The thermal degradation of PET and analogous polyesters measured by thermal analysis-fourier transform infrared spectroscopy [J].

Holland, BJ ;

Hay, JN .

POLYMER, 2002, 43 (06) :1835-1847

[8] Reactive processing of poly(ethylene terephthalate) modified with multifunctional epoxy-based additives [J].

Japon, S ;

Boogh, L ;

Leterrier, Y ;

Månson, JAE .

POLYMER, 2000, 41 (15) :5809-5818

[9] SOLID-STATE POLYCONDENSATION OF POLY(ETHYLENE-TEREPHTHALATE) RECYCLED FROM POSTCONSUMER SOFT-DRINK BOTTLES .1. [J].

KARAYANNIDIS, GP ;

KOKKALAS, DE ;

BIKIARIS, DN .

JOURNAL OF APPLIED POLYMER SCIENCE, 1993, 50 (12) :2135-2142

[10]

KAUSCH HH, 2001, MAT POLYM PROPRIETES, P374

← 1 2 →