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Title: The influence of pigments and additives on the crystallisation and warpage behaviour of polyethylenes
Author: Chung, Chee Keong
Awarding Body: Loughborough University
Current Institution: Loughborough University
Date of Award: 2013
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The primary reason for incorporating pigments into plastic materials is to impart the desired colour to finished articles. Some pigments however, may interact with the polymer leading to unexpected deleterious effects. Organic pigments, especially phthalocyanines, are favourable for their brilliant shade but are also well known for causing part distortion or warpage. This causes problems in parts which require good dimensional stability such as crates, containers, trays, caps and closures. Despite that, there are not many published studies on the root cause and mechanism of warpage induced by the pigment. Hence, the objective of this research is to study the influence of such pigments on the dimensional stability, crystallisation behaviour and morphology of polyethylenes in order to have a better understanding on the mechanism of warpage, which could possibly lead to a solution in overcoming this problem.
Supervisor: Not available Sponsor: Clariant (Singapore) ; BU Masterbatches
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Dimensional stability ; Shrinkage ; Warpage ; Crystallisation ; Nucleation ; Morphology ; Crystalline orientation ; Polyethylene ; High density polyethylene ; Pigment ; Phthalocyanine ; Carboxylic acid salt ; Calcium carbonate