POSTCONDENSATION AND OXIDATION PROCESSES IN MOLTEN POLYAMIDE 6

被引：39

作者：

MARECHAL, P ^{[1
]}

LEGRAS, R ^{[1
]}

DEKONINCK, JM ^{[1
]}

机构：

[1] EXXON CHEM INT INC,MACHELEN CHEM TECHNOL CTR,B-1830 MACHELEN,BELGIUM

来源：

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 1993年 / 31卷 / 08期

关键词：

POLYAMIDE; 6; DEGRADATION; CONDENSATION; OXIDATION; AMINE CHAIN END CONCENTRATION; UV ABSORBENCY; MOLECULAR WEIGHT;

D O I：

10.1002/pola.1993.080310812

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Polyamide samples were heated under vacuum or mixed in a Brabender plastograph. UV absorbance, chain end concentration, and molecular weight were studied. Postcondensation was observed for polyamide heated under vacuum. For polyamide samples mixed in the plastograph, atmosphere, shear rate, and temperature changed. Melt viscosity and intrinsic viscosity are in good correlation in a log-log plot. Oxidation effect on molecular weight and amine chain end concentration could be well related to UV absorbance. The oxygen diffusion into the molten polyamide is a critical parameter. The oxygen concentration in the polyamide mixed under air is ca. 20 times higher than when mixed under nitrogen. The introduction of preoxidized material in the molten polyamide or mixing in the presence of oxygen have similar effects. Postcondensation and oxidation strongly influence the melt behavior of polyamides.

引用

页码：2057 / 2067

页数：11

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