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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

THE CRYSTALLIZATION AND MELTING OF LINEAR POLYETHYLENE

Unknown Date (has links)
Changes in the crystallite size distribution during the isothermal crystallization of linear polyethylene fractions were studied using low frequency Raman spectroscopy. Increases in the crystallite size and broadening distributions were observed as a function of time for all molecular weights studied. Large increases in size occurred even after most of the isothermal crystallinity had formed. The rate of increase was faster for higher crystallization temperatures, while the process was retarded for higher molecular weights. The existing theories for crystallite thickening were found to be insufficient to explain all of the experimental results. These experimental observations could be rationalized if the thickening occurred by a partial melting process. The observed increases in thickness were found to correlate very well with increases in calorimetric melting points. The extrapolation of this thickness-melting point data to obtain an equilibrium melting point was complicated by the possibility of changes in the crystallite's surface free energy. The use of melting temperature-crystallization temperature plots was found to be a better method of extrapolation. The best estimate of the equilibrium melting point of polyethylene was determined to be 146(DEGREES)C. / Source: Dissertation Abstracts International, Volume: 44-06, Section: B, page: 1847. / Thesis (Ph.D.)--The Florida State University, 1983.
2

THE EFFECTS OF MOLECULAR WEIGHT AND CONCENTRATION ON THE CRYSTALLIZATION KINETICS OF POLYETHYLENE N-HEXADECANE SYSTEM

Unknown Date (has links)
Source: Dissertation Abstracts International, Volume: 37-12, Section: B, page: 6164. / Thesis (Ph.D.)--The Florida State University, 1976.
3

A LINEAR RESPONSE FORMULATION OF THE CIRCULAR DICHROISM OF HELICAL POLYMER RODS

Unknown Date (has links)
Source: Dissertation Abstracts International, Volume: 38-12, Section: B, page: 5973. / Thesis (Ph.D.)--The Florida State University, 1977.
4

THERMODYNAMIC AND MORPHOLOGICAL PROPERTIES OF BULK AND SOLUTION CRYSTALLIZED ETHYLENE BUTENE-1 COPOLYMER FRACTIONS

Unknown Date (has links)
Source: Dissertation Abstracts International, Volume: 40-02, Section: B, page: 0775. / Thesis (Ph.D.)--The Florida State University, 1978.
5

MECHANISMS OF PRECIPITATION OF POLY-L-GLUTAMIC ACID

Unknown Date (has links)
Source: Dissertation Abstracts International, Volume: 34-10, Section: B, page: 4911. / Thesis (Ph.D.)--The Florida State University, 1973.
6

A Broad line NMR study of molecular-weight fractions of bulk crystallized polyethylene

Chow, Chak Yan Unknown Date (has links)
Source: Dissertation Abstracts International, Volume: 34-04, Section: B, page: 1458. / Thesis (Ph.D.)--The Florida State University, 1973.
7

CRYSTALLIZATION KINETICS AND THERMODYNAMIC PROPERTIES OF LINEAR POLYETHYLENE OVER AN EXTENDED MOLECULAR WEIGHT RANGE

Unknown Date (has links)
Source: Dissertation Abstracts International, Volume: 32-01, Section: B, page: 0222. / Thesis (Ph.D.)--The Florida State University, 1970.
8

The sequential insertion of carbon monoxide and non-linear optical chromophores into palladium-carbon bonds : a novel route to non-linear optical polyketones

Oliver, Andrew, 1975- January 2000 (has links)
No description available.
9

The structure and dynamic mechanical properties of some plasticised styrene-vinylpyridinium iodide ionomers /

Wollmann, Daphne January 1989 (has links)
No description available.
10

Physical properties of polymers : I. Gelation of poly-4-methylpentene-1. II. Growth rate of isotactic polypropylene spherulites in immiscible blends

St-Jean, Guylaine January 1990 (has links)
No description available.

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