Nanoscale calorimetry of isolated polyethylene single crystals

被引：36

作者：

Kwan, AT ^{[1
]}

Efremov, MY ^{[1
]}

Olson, EA ^{[1
]}

Schiettekatte, F ^{[1
]}

Zhang, M ^{[1
]}

Geil, PH ^{[1
]}

Allen, LH ^{[1
]}

机构：

[1] Univ Illinois, Mat Sci & Engn & Coordinated Sci Lab, Urbana, IL 61801 USA

来源：

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 2001年 / 39卷 / 11期

关键词：

microelectromechanical systems; calorimetry; nanocalorimetry; polyethylene single crystals; melting;

D O I：

10.1002/polb.1097

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We used thin-film differential scanning calorimetry to investigate the melting of isolated polyethylene single crystals with lamellar thicknesses of 12 +/- 1 nm. We observed the melting of as few as 25 crystals. Over a wide number of crystals (25-2000 crystals), the heat of fusion was 40% larger than the bulk value. The melting temperature of the isolated single crystals was 123 +/- 2 degreesC, 9 degreesC lower than that of the bulk material. We also measured the heat of fusion of quenched crystals (+/- 15%) over a wide range of heating rates (20,000 -100,000 K/s). Annealing the quenched crystals resulted in shifts in the endotherm peak by as much as 15 degreesC. (C) 2001 John Wiley & Sons, Inc.

引用

页码：1237 / 1245

页数：9

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