Hanley, T.; Sutton, D.; Heeley, E.; Moad, G. and Knott, R.
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|DOI (Digital Object Identifier) Link:||http://doi.org/10.1107/S0021889807003512|
|Google Scholar:||Look up in Google Scholar|
The synchrotron-based small-angle X-ray scattering (SAXS) technique was used to investigate the shear-induced crystallization kinetics of branched/unbranched poly(ethylene terephthalate) (PET). Reactive extrusion of bottle-grade PET with the branching and chain-extension agents pyromellitic dianhydride and pentaerythritol results in enhanced rheological properties, such as higher melt strength and higher viscosity. In this study, six samples of PET were investigated: linear PET [intrinsic viscosity (IV) ≈0.76 dm3 g-1]; four branched PETs produced from linear PET by a reactive extrusion technique (IV ≈0.86-1.06 dm3 g-1); and a control PET (IV ≈0.73 dm3 g-1) extruded under the same conditions without reactive agents. SAXS data were recorded for the PET at the melt temperature and time-resolved SAXS data were recorded following the application of a step shear (53 s-1 for 2 s). As the PET IV was increased, the extent of shear-induced orientation increased, whilst the time taken for the polymer to initiate and complete crystallization decreased.
|Item Type:||Journal Article|
|Copyright Holders:||2007 International Union of Crystallography|
|Keywords:||poly(ethylene terephthalate); branched PETs; polyesters; crystallization; SAXS|
|Academic Unit/Department:||Science > Life, Health and Chemical Sciences
|Depositing User:||Ellen Heeley|
|Date Deposited:||17 Feb 2011 15:46|
|Last Modified:||24 Feb 2016 14:30|
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