Enhanced Mechanical Relaxation below the Glass Transition Temperature in Partially Supramolecular Networks

被引：27

作者：

Dimopoulos, Athanasios ^{[2
]}

Wietor, Jean-Luc ^{[1
]}

Wubbenhorst, Michael ^{[3
]}

Napolitano, Simone ^{[3
]}

van Benthem, Rolf A. T. M. ^{[2
]}

de With, Gijsbertus ^{[2
]}

Sijbesma, Rint P. ^{[1
]}

机构：

[1] Eindhoven Univ Technol, Dept Chem Engn & Chem, Lab Macromol & Organ Chem, NL-5600 MB Eindhoven, Netherlands

[2] Eindhoven Univ Technol, Dept Chem Engn & Chem, Lab Mat & Interface Chem, NL-5600 MB Eindhoven, Netherlands

[3] Katholieke Univ Leuven, Dept Phys & Astron, Lab Acoust & Thermal Phys, B-3001 Louvain, Belgium

来源：

MACROMOLECULES | 2010年 / 43卷 / 20期

关键词：

POLYMER NETWORKS;

D O I：

10.1021/ma1005638

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Cross-linked polymers in which part of the covalent cross-links have been replaced by reversible cross-links have potential application in coatings with improved stress relaxation. Here We present a detailed study of materials based on copolymers of epsilon-caprolactone and L-lactic acid, containing different ratios of covalent and ureidopyrimidinone(UPy) dimer cross-links. Their thermal and mechanical properties were tested by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and dielectric relaxation spectroscopy (DRS). By extrapolation of the alpha* relaxation process in DMA (arising from dynamics of the reversible UPy cross-links) to temperatures below the glass transition temperature (T(g)), it was shown that the reversible cross-links contribute significantly to the relaxation of stress below T(g) that was observed in creep measurements.

引用

页码：8664 / 8669

页数：6

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