Use this URL to cite or link to this record in EThOS: | https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382571 |
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Title: | Solubility and migration of stabilizing additives in polyolefins | ||||
Author: | Okopi, I. A. |
ISNI:
0000 0001 3455 9505
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Awarding Body: | University of Sussex | ||||
Current Institution: | University of Sussex | ||||
Date of Award: | 1987 | ||||
Availability of Full Text: |
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Abstract: | |||||
This thesis describes a series of studies of the
physical behaviour of commercially important stabilizing
additives in polyolefins.
A series of nickelthiocarbamates have been
synthesised and their solubilities measured as a function
of temperature in linear hydrocarbon solvents, low density
polyethylene and isotactic polypropylene. The results
are compared with predictions from a regular solution
model.
The loss of three benzophenone UV-stabilizers from
supersaturated solution has been investigated with the
aim of determining whether the loss is a diffusion
controlled blooming or involves phase separation. Our
data shows this phenomenon is a diffusion controlled
blooming process. The volatilities of these same
UV-stabilizers have been measured as a function of
temperature.
The solubility of a typical hindered amine (Tinuvin
770) has been investigated in hydrocarbon solvents and
in polypropylene by infrared methods. Low solubility
values were obtained in all cases.
The diffusion of Tinuvin 770 in polypropylene has
been monitored by an infrared method developed for the
purpose and the diffusion coefficient estimated over a
range of temperatures.
Litp.rature data on solubility of additives together
with our own data are critically reviewed and the effect
of structure on solubility is analysed. Data on the
benzophenone additives allows prediction of loss times
and mechanisms to be made for the first time.
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Supervisor: | Not available | Sponsor: | Not available | ||
Qualification Name: | Thesis (Ph.D.) | Qualification Level: | Doctoral | ||
EThOS ID: | uk.bl.ethos.382571 | DOI: | Not available | ||
Keywords: | Polymer stabilising additives | ||||
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