High-Temperature Viscoelastic Relaxation in All-Cellulose Composites

被引：3

作者：

Duchemin, Benout J. C. ^{[1
]}

Staiger, Mark P. ^{[2
]}

Newman, Roger H. ^{[3
]}

机构：

[1] Univ Havre, CNRS, Lab Ondes & Milieux Complexes, UMR 6294, F-76058 Le Havre, France

[2] Univ Canterbury, Dept Mech Engn, Christchurch 1, New Zealand

[3] Scion, Rotorua 3046, New Zealand

来源：

MACROMOLECULAR SYMPOSIA | 2014年 / 340卷 / 01期

关键词：

all-cellulose composites; crystal structures; polysaccharides; viscoelastic properties; NEUTRON FIBER DIFFRACTION; HYDROGEN-BONDING SYSTEM; GLASS-TRANSITION TEMPERATURE; SYNCHROTRON X-RAY; THERMAL-DECOMPOSITION; MECHANICAL-PROPERTIES; CRYSTALLINE REGIONS; AMORPHOUS CELLULOSE; ELASTIC-MODULUS;

D O I：

10.1002/masy.201300123

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

All-cellulose composites were prepared across a range of different crystallinities in order to examine relationships between phase composition and viscoelastic behaviour in the temperature range of 270 degrees C to 340 degrees C corresponding to the alpha(1) mechanical relaxation. Composite films were prepared by partial dissolution of microcrystalline cellulose in a LiCl/N,N-dimethylacetamide (LiCl/DMAc) solvent system using the film casting technique. Dynamic mechanical analysis showed two contributions to alpha(1) relaxation, with tan delta maxima at 303 +/- 2 degrees C and at approximately 325 degrees C. The height of the maximum or shoulder at 303 +/- 2 degrees C decreased with increasing crystallinity, and was therefore assigned to molecular motion associated with chemical decomposition in non-crystalline domains. The maximum at 325 degrees C was assigned to chemical decomposition in chains associated with the surfaces of crystalline domains. Composites with high crystallinity showed best retention of the dynamic storage modulus when tested at 300 degrees C.

引用

页码：52 / 58

页数：7

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