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Karthik Nair
IRC in Polymer Science and Technology, Mechanical and Energy Systems Engineering, Faculty of Engineering and Informatics, University of Bradford, Bradford BD7 1DP, UK

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Journal article
Published: 13 August 2019 in Polymers
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This is a study of the modelling and prediction of strain recovery in a polylactide. Strain recovery near the glass transition temperature is the underlying mechanism for the shape memory in an amorphous polymer. The investigation is aimed at modelling such shape memory behaviour. A PLA-based copolymer is subjected to stress-strain, stress relaxation and strain recovery experiments at large strain at 60 °C just below its glass transition temperature. The material is 13% crystalline. Using published data on the mechanical properties of the crystals, finite element modelling was used to determine the effect of the crystal phase on the overall mechanical behaviour of the material, which was found to be significant. The finite element models were also used to relate the stress-strain results to the yield stress of the amorphous phase. This yield stress was found to possess strain rate dependence consistent with an Eyring process. Stress relaxation experiments were also interpreted in terms of the Eyring process, and a two-process Eyring-based model was defined that was capable of modelling strain recovery behaviour. This was essentially a model of the amorphous phase. It was shown to be capable of useful predictions of strain recovery.

ACS Style

John Sweeney; Paul Spencer; Karthik Nair; Phil Coates. Modelling the Mechanical and Strain Recovery Behaviour of Partially Crystalline PLA. Polymers 2019, 11, 1342 .

AMA Style

John Sweeney, Paul Spencer, Karthik Nair, Phil Coates. Modelling the Mechanical and Strain Recovery Behaviour of Partially Crystalline PLA. Polymers. 2019; 11 (8):1342.

Chicago/Turabian Style

John Sweeney; Paul Spencer; Karthik Nair; Phil Coates. 2019. "Modelling the Mechanical and Strain Recovery Behaviour of Partially Crystalline PLA." Polymers 11, no. 8: 1342.

Journal article
Published: 30 October 2015 in Pharmaceutics
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Plasma technology has been widely used to increase the surface energy of the polymer surfaces for many industrial applications; in particular to increase in wettability. The present work was carried out to investigate how surface modification using plasma treatment modifies the surface energy of micro-injection moulded microneedles and its influence on drug delivery. Microneedles of polyether ether ketone and polycarbonate and have been manufactured using micro-injection moulding and samples from each production batch have been subsequently subjected to a range of plasma treatment. These samples were coated with bovine serum albumin to study the protein adsorption on these treated polymer surfaces. Sample surfaces structures, before and after treatment, were studied using atomic force microscope and surface energies have been obtained using contact angle measurement and calculated using the Owens-Wendt theory. Adsorption performance of bovine serum albumin and release kinetics for each sample set was assessed using a Franz diffusion cell. Results indicate that plasma treatment significantly increases the surface energy and roughness of the microneedles resulting in better adsorption and release of BSA.

ACS Style

Karthik Nair; Benjamin Whiteside; Colin Grant; Rajnikant Patel; Cristina Tuinea-Bobe; Keith Norris; Anant Paradkar. Investigation of Plasma Treatment on Micro-Injection Moulded Microneedle for Drug Delivery. Pharmaceutics 2015, 7, 471 -485.

AMA Style

Karthik Nair, Benjamin Whiteside, Colin Grant, Rajnikant Patel, Cristina Tuinea-Bobe, Keith Norris, Anant Paradkar. Investigation of Plasma Treatment on Micro-Injection Moulded Microneedle for Drug Delivery. Pharmaceutics. 2015; 7 (4):471-485.

Chicago/Turabian Style

Karthik Nair; Benjamin Whiteside; Colin Grant; Rajnikant Patel; Cristina Tuinea-Bobe; Keith Norris; Anant Paradkar. 2015. "Investigation of Plasma Treatment on Micro-Injection Moulded Microneedle for Drug Delivery." Pharmaceutics 7, no. 4: 471-485.