PHOTOPHYSICAL APPROACHES TO CHARACTERIZATION OF GUEST SITES AND MEASUREMENT OF DIFFUSION RATES TO AND FROM THEM IN UNSTRETCHED AND STRETCHED LOW-DENSITY POLYETHYLENE FILMS

被引：0

作者：

NACIRI, J ^{[1
]}

HE, ZQ ^{[1
]}

COSTANTINO, RM ^{[1
]}

LU, LD ^{[1
]}

HAMMOND, GS ^{[1
]}

WEISS, RG ^{[1
]}

机构：

[1] GEORGETOWN UNIV,DEPT CHEM,WASHINGTON,DC 20057

来源：

MULTIDIMENSIONAL SPECTROSCOPY OF POLYMERS: VIBRATIONAL, NMR, AND FLUORESCENCE TECHNIQUES | 1995年 / 598卷

关键词：

D O I：

暂无

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Various luminescence and photochemical techniques have been developed to probe the natures and accessibilities of the sites available to guest molecules in low-density polyethylene films. The methods, which include covalent modification of interior sites with fluorophores, are described. The results indicate that a distribution of site types, each with its characteristic shape, free-volume, and accessibility, is present. Furthermore, this distribution is changed drastically when a film is stretched. Activation energies for diffusion of a series of N,N-dialkylanilines in unstretched and stretched, modified and ''native'' films are reported, compared, and analyzed.

引用

页码：425 / 445

页数：21

共 53 条

[11]

COMYN J, 1985, POLYM PERMEABILITY, pCH1

[12]

Crank J., 1956, MATH DIFFUSION

[13]

Glenz W., 1970, J MACROMOL SCI B, V4, P473, DOI DOI 10.1080/00222347008229369

[14] DEUTERIUM NMR OF DEUTERATED PROBES DISSOLVED IN STRETCHED POLYETHYLENE [J].