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In vitro mineralisation of grafted ePTFE membranes carrying carboxylate groups

Bioactive Materials 2017年第1期2卷 27-34页

作者： Norsyahidah Mohd Hidzir David J.T.Hill Darren Martin Lisbeth Grøndahl School of Chemistry and Molecular Biosciences University of QueenslandSt LuciaQLD4072Australia Australian Institute for Bioengineering and Nanotechnology University of QueenslandSt LuciaQLD4072Australia School of Applied Physics Faculty of Science&TechnologyUniversiti Kebangsaan MalaysiaUKM BangiSelangor43600Malaysia

In vitro mineralisation in simulated body fluid(SBF)of synthetic polymers continues to be an important area of research as the outcomes cannot be *** study evaluates a series of ePTFE membranes grafted with carboxylate-containing copolymers,specifically using acrylic acid and itaconic acid for *** samples differ with regards to graft density,carboxylate density and polymer *** type and amount of mineral produced in 1.5×SBF was dependent on the sample characteristics as evident from XPS,SEM/EDX,and FTIR *** was found that the graft density affects the mineral phases that form and that low graft density appear to cause co-precipitation of calcium carbonate and calcium *** and branched graft copolymer topology led to hydroxyapatite mineralisation whereas crosslinked graft copolymers resulted in formation of a mixture of calcium-phosphate *** study demonstrates that in vitro mineralisation outcomes for carboxylate-containing graft copolymers are *** findings of this study have implications for the design of bioactive coatings and are important for understanding the bone-biomaterial interface.

关键词： Simulated body fluid Expanded poly(tetrafluoroethylene) graft copolymerisation Carboxylate groups

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Preparation of Peanut Shell Cellulose Double-Network Hydrogel and Its Adsorption Capacity for Methylene Blue

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Journal of Renewable Materials 2023年第7期11卷 3001-3023页

作者： Yalin Li Lei Liu Wenbao Huang Junpu Xie Zhaoxia Song Shuna Guo Enci Wang Department of College of Environment and Bioengineering Henan University of EngineeringZhengzhou451191China School of Mathematics and Statistics Carleton UniversityOntarioK1S 5B6Canada

To achieve optimal recovery and value-added utilisation of cellulose in peanut shells,the cellulose in peanut shells was first extracted using the sodium hydroxide-sodium chlorite ***,cellulose hydrogel was prepared by graft copolymerisation using N,N’-methylenebisacrylamide as the cross-linking agent,sodium persulfate as the initiator,and acrylic acid as the *** optimisation experiments were designed to obtain optimal process parameters for hydrogel preparation with the cellulose dosage of 0.40 g,initiator dosage of 0.20 g,polymerisation temperature of 70°C,cross-linking agent of 0.25 g,and monomer dosage of 3.0 *** effect of initiator dosage on hydrogel synthesis was the most significant,followed by monomer dosage and reaction *** using X-ray diffraction analysis and scanning electron microscopy revealed that the hydrogel was amorphous and exhibited a distinct three-dimensional double network *** swelling kinetic analysis showed that the hydrogel swelling process was divided into three stages,and fitted the Schott secondary swelling kinetic *** prepared hydrogel had a good adsorption effect on methylene blue;the adsorption of methylene blue by the hydrogel was 1.259 mg/g at 25°C when the initial concentration of methylene blue was 5 mg/*** adsorption kinetics of the hydrogel fit the pseudo-first-order kinetic model,pseudo-secondorder kinetic model,Eovich model and particle diffusion *** best fitting effect was obtained with the pseudo-second-order kinetic *** adsorption isotherm analysis of methylene blue on hydrogel showed that the adsorption process was consistent with Langmuir and Freundlich *** correlation coefficient of the Freundlich isotherm model was higher,indicating that the adsorption of methylene blue on hydrogel was mainly chemisorption.

关键词： Cellulose hydrogel graft copolymerisation cross-linking polymerisation swelling property

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