Diffusion behaviour of additives in polypropylene in correlation with polymer properties

被引:19
作者
Begley, T. H. [2 ]
Brandsch, J. [1 ]
Limm, W. [2 ]
Siebert, H.
Piringer, O. [1 ]
机构
[1] FABES Forsch GmbH, Munich, Germany
[2] US FDA, Ctr Food Safety & Appl Nutr, College Pk, MD USA
来源
FOOD ADDITIVES AND CONTAMINANTS PART A-CHEMISTRY ANALYSIS CONTROL EXPOSURE & RISK ASSESSMENT | 2008年 / 25卷 / 11期
关键词
chromatography; high-performance liquid chromatography (HPLC); additives general; migration; diffusion; packaging; food simulants; modelling; polypropylene;
D O I
10.1080/02652030802162747
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The migration behaviour of polymer additives in 17 polypropylene (PP) samples is described. These samples cover the major types of PP used in food packaging. The diffusion coefficients of additives with relatively small molecular masses, Mr = 136 (limonene), as well as the migration of typical antioxidants used in PP up to Mr = 1178 (IRGANOX 1010), were measured at different temperatures. In addition, the diffusion data and percentages of xylene-soluble fractions were correlated. This enables a prediction of the migration behaviour of a PP sample by testing its 'isotactic index' with xylene. The results clearly indicate that PP can be subdivided, from the migration point of view, into the monophasic homopolymer (h-PP), the monophasic random copolymer (r-PP), and the heterophasic copolymer (heco-PP). The diffusion coefficients for r-PP are at least one order of magnitude higher than those of h-PP and comparable with the values for heco-PP. Upper limits for the diffusion values can be calculated based on the safety margin required by consumer protection laws.
引用
收藏
页码:1409 / 1415
页数:7
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