INELASTIC NEUTRON SCATTERING STUDY ON EG AND PEGS AS A FUNCTION OF THE DEGREE OF POLYMERIZATION

被引：0

作者：

Magaziu, S. ^{[1
]}

Maisano, G.

Migliardo, F.

机构：

[1] Univ Messina, Dipartimento Fis, POB 55, I-98166 Messina, Italy

来源：

JOURNAL OF PHYSICAL STUDIES | 2005年 / 9卷 / 01期

关键词：

inelastic neutron scattering; vibrational properties; polymers; disordered longitudinal acoustic mode;

D O I：

暂无

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The present paper concerns with Inelastic Neutron Scattering (INS) results on Ethylene Glycol (EG) and PolyEthylene Glycols (PEGs) at different degree of polymerization. Significant spectral features of these systems are discussed in comparison with Raman spectroscopy findings. The results reveal a peculiar dependence on the degree of polymerization of the frequencies of the disordered longitudinal acoustic mode (D-LAM), which can account for the different bioprotectant effectiveness of PEGs at ambient and at very low temperature. The D-LAM behaviour as a function of the degree of polymerization as obtained by INS at low temperature is opposite to that observed by Raman spectroscopy at high temperature. These intriguing results are discussed in terms of inter and intra-molecular interactions within the framework of current theories.

引用

页码：45 / 51

页数：7

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