CRYSTALLINITY OF UNIFORM OLIGO(OXYETHYLENE) MONO-N-ALKYL ETHERS STUDIED BY X-RAY-DIFFRACTION AND DIFFERENTIAL SCANNING CALORIMETRY

被引：38

作者：

CRAVEN, JR

HAO, Z

BOOTH, C

机构：

[1] UNIV MANCHESTER,DEPT CHEM,MANCHESTER M13 9PL,LANCS,ENGLAND

[2] ACAD SINICA,INST APPL CHEM,CHANGCHUN,PEOPLES R CHINA

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1991年 / 87卷 / 08期

关键词：

D O I：

10.1039/ft9918701183

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The crystallinity of two series of uniform oligo(oxyethylene) mono-n-alkyl ethers has been investigated: alpha-alkyl,omega-hydroxyoligo(oxyethylene)s, H(CH2)n(OCH2CH2)mOH, and alpha-alkyl,omega-methoxyoligo(oxyethylene)s, H(CH2)n(OCH2CH2)mOCH3. The hydroxy-ended oligomers formed bilayer crystals, and the methoxy-ended oligomers formed monolayer crystals. The helical oxyethylene blocks were oriented normal to the layer-crystal end-group plane, whilst the trans-planar alkyl blocks were generally tilted at an angle delta = 60-degrees. The melting temperature and enthalpy of fusion were higher for hydroxy-ended oligomers than for corresponding methoxy-ended oligomers.

引用

页码：1183 / 1186

页数：4

共 20 条

[1]

CRAVEN JR, 1989, MAKROMOL CHEM, V190, P1207

[2]

DOMSZY RC, 1982, MAKROMOL CHEM, V183, P1051

[3] MOLECULAR-CONFORMATION AND CRYSTAL PACKING OF NORMAL-ALKYL OLIGO(ETHYLENE OXIDES) [J].