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Cellulose microfibers as reinforcing...

Bhattacharya, Deepanjan.

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Cellulose microfibers as reinforcing agents in biodegradable thermoplastic composites.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Cellulose microfibers as reinforcing agents in biodegradable thermoplastic composites./
作者:	Bhattacharya, Deepanjan.
面頁冊數:	177 p.
附註:	Major Professor: William T. Winter.
Contained By:	Dissertation Abstracts International64-03B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3084749

Cellulose microfibers as reinforcing agents in biodegradable thermoplastic composites.
Bhattacharya, Deepanjan.

Cellulose microfibers as reinforcing agents in biodegradable thermoplastic composites. - 177 p.

Major Professor: William T. Winter.

Thesis (Ph.D.)--State University of New York College of Environmental Science and Forestry, 2003.

This dissertation describes the isolation, modification, characterization and utilization of cellulose microfbers. Microfibers (MFs) were generated from bagasse, sugar cane biomass, in two distinct stages. Initially, whole cellulose fibers were extracted from bagasse after removal of hemicellulose and lignin by pulping. The extracted fibers were subjected, successively, to controlled hydrolysis, homogenization, and sonication in order to convert them into sub-micron, rod-shaped, asymmetric particles with a high aspect ratio. The diameter of these particles varied between 200 nm and 2 μm. The surface of the MFs was topochemically modified with maleate ester moieties in an attempt to improve interfacial compatibility of the MF particles with the biodegradable thermoplastic matrix into which they were subsequently dispersed. Thermogravimetric analyses (TGA) of the Cellulose MFs revealed significant improvements in their thermal stability and resistance to degradation upon surface modification. A kinetic study of the thermal degradation process revealed that while both bagasse and unmodified cellulose MFs exhibited first-order reaction kinetics, the degradation pattern of surface modified cellulose was more complex. The dispersion of such microfibers as reinforcing fillers in matrices of biodegradable, commercially available co-polyesters (CP) leads to nanocomposite materials. The mechanical properties of these nanocomposites were studied, as a function of filler loading and temperature. Differential Scanning Calorimetery (DSC) was used to determine any changes in the glass transition temperature (T<sub>g</sub>) and other thermal properties of the system. The reinforcing properties of MFs were compared with those of both other nano-fillers like nanoclay and comparatively larger fillers like wood flour. Each of the fillers increased the storage modulus of the CP. However, the reinforcing effect of smaller, asymmetric particles i.e. nanoclays and MFs, were far more pronounced than those obtained with the larger wood-flour particles. Additionally, cellulose MFs that were topochemically maleated were found to have even better interfacial compatibility with the CP than the unmodified MFs.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Cellulose microfibers as reinforcing agents in biodegradable thermoplastic composites.
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520 $a This dissertation describes the isolation, modification, characterization and utilization of cellulose microfbers. Microfibers (MFs) were generated from bagasse, sugar cane biomass, in two distinct stages. Initially, whole cellulose fibers were extracted from bagasse after removal of hemicellulose and lignin by pulping. The extracted fibers were subjected, successively, to controlled hydrolysis, homogenization, and sonication in order to convert them into sub-micron, rod-shaped, asymmetric particles with a high aspect ratio. The diameter of these particles varied between 200 nm and 2 μm. The surface of the MFs was topochemically modified with maleate ester moieties in an attempt to improve interfacial compatibility of the MF particles with the biodegradable thermoplastic matrix into which they were subsequently dispersed. Thermogravimetric analyses (TGA) of the Cellulose MFs revealed significant improvements in their thermal stability and resistance to degradation upon surface modification. A kinetic study of the thermal degradation process revealed that while both bagasse and unmodified cellulose MFs exhibited first-order reaction kinetics, the degradation pattern of surface modified cellulose was more complex. The dispersion of such microfibers as reinforcing fillers in matrices of biodegradable, commercially available co-polyesters (CP) leads to nanocomposite materials. The mechanical properties of these nanocomposites were studied, as a function of filler loading and temperature. Differential Scanning Calorimetery (DSC) was used to determine any changes in the glass transition temperature (T<sub>g</sub>) and other thermal properties of the system. The reinforcing properties of MFs were compared with those of both other nano-fillers like nanoclay and comparatively larger fillers like wood flour. Each of the fillers increased the storage modulus of the CP. However, the reinforcing effect of smaller, asymmetric particles i.e. nanoclays and MFs, were far more pronounced than those obtained with the larger wood-flour particles. Additionally, cellulose MFs that were topochemically maleated were found to have even better interfacial compatibility with the CP than the unmodified MFs.
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