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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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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.
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Showing 351 to 360 of 1018 (0.038 seconds)| 351 |
Heterogeneous crystallisation of polyethylene terephthalate. A study of the influence of organic and inorganic additives on the rate of crystallisation of polyethylene terephthalate and the subsequent changes in morphology and mechanical properties.Ibbotson, C. January 1976 (has links)
The effect of various inorganic and organic additives as possible
nucleating agents on the crystallisation behaviour of P. E. T. and the
suosequent influence on the morphological and mechanical properties
has been examined. Various methods of mixing(: the polymer and
additive were investigated and a method involving the screw-Extrusion
of the polymer and the additive was ultimately adopted. Crystallisation
studies were carried out using differential scanning calorimetry under
dynamic and isothermal modes. The results produced under conditions
of isothermal crystallisation were analysed by means of a computer.
Despite differences between batches of polymer all the additives
with the exception of indigo produced a nucleating effect in the polymer
as indicated by an increase in the rate of crystallisation compared
with that of the base polymer. Two organo-metallic substances
(sodium benzoate and sodium stearate) proved to be the most effective
in this respect by decreasing the degree of supercooling of the polymer
by 20 [degrees].
Morphological studies were carried out on isothermally crystallised
samples, after etching and replication using a transmission electron
microscope. A nodular structure whose dimensions were sensitive to
both the nucleating agent and the temperature of crystallisation was
observed.
Mechanical testing of samples direct from the D. S. C. was carried
out using a compression method. The breaking loads were found to
vary with both the type of nucleating agent used and the
crystallisation temperature chosen. A separate study involving the
exanination of the resulting fracture surfaces by scanning electron
microscopy revealed that a, high breaking load was associated with a
fine discontinuous structure whereas lower breaking loads were
characterised by a more continuous linear appearance. This implies
a higher energy of fracture due to the increased surface area of
the fracture surface of the former.
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| 352 |
Surface treatment of polyethylene in electrical dischargesStradal, Milos January 1974 (has links)
Note:
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| 353 |
Effects of liquid environments on the mechanical fatigue behavior of polyethyleneLu, Wen-Haw January 1992 (has links)
No description available.
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| 354 |
New compatibilizing agents for blends of linear low-density polyethylene and polystyrene as model systems of the post-consumer plastic waste streamLi, Tao January 1994 (has links)
No description available.
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| 355 |
Decrosslinking of Crosslinked Polyethylene via Ultrasonically Aided ExtrusionHuang, Keyuan 21 May 2015 (has links)
No description available.
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| 356 |
Acetone Induced Structural Effects on Charge Storage in PEO-Graphite Supercapacitor ElectrodesThar, Dhaval 16 June 2017 (has links)
No description available.
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| 357 |
Evaluation of Microstructure and Free Volume in Polyesters caused By Orientation and AntiplasticizersZekriardehani, Shahab January 2017 (has links)
No description available.
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| 358 |
POLYETHYLENE-CLAY NANOCOMPOSITES: PROCESSING-STRUCTURE-PROPERTY RELATIONSHIPBAFNA, AYUSH ASHOK 01 July 2004 (has links)
No description available.
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| 359 |
EFFECT OF MOLECULAR WEIGHT OF POLYETHYLENE GLYCOLS ON THEIR FUNCTION AS LUBRICANT SPARING BINDERS IN TABLET TECHNOLOGYHamid, Rezaei 11 October 2001 (has links)
No description available.
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| 360 |
Evaluation of the geometery effect of the profile of high density polyethylene pipesHengprathanee, Songwut January 2000 (has links)
No description available.
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