2024-03-29T14:55:09Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/663762022-11-17T02:08:08Zhdl_2115_20055hdl_2115_8527Molecular structure and properties of click hydrogels with controlled dangling end defectZhang, Ao-kaiLing, JunLi, KewenFu, Guo-dongNakajima, TasukuNonoyama, TakayukiKurokawa, Takayuki1000020250417Gong, Jian Pingopen accessThis is the peer reviewed version of the following article: J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 1227–1236, which has been published in final form at 10.1002/polb.24028. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.Affine modelclick chemistrydangling endsGent modelhydrogelsmechanical propertiesmodelingMonte Carlo simulationnetwork inhomogeneityPhantom modelstructure-property relations460In this study, controlled amount of dangling ends is introduced to the two series of poly(ethylene glycol)-based hydrogel networks with three and four crosslinking functionality by using click chemistry. The structure of the gels with regulated defect percentage is confirmed by comparing the results of low-field NMR characterization and Monte Carlo simulation. The mechanical properties of these gels were characterized by tensile stress–strain behaviors of the gels, and the results are analyzed by Gent model and Mooney–Rivlin model. The shear modulus of the swollen gels is found to be dependent on the functionality of the network, and decreases with the defect percentage. Furthermore, the value of shear modulus well obeys the Phantom model for all the gels with varied percentage of the defects. The maximum extension ratio, obtained from the fitting of Gent model, is also found to be dependent on the functionality of the network, and does not change with the defect percentage, except at very high defect percentage. The value of the maximum extension ratio is between that predicted from Phantom model and the Affine model. This indicates that at the large deformation, the fluctuation of the crosslinking points is suppressed for some extend but still exists. Polymer volume fractions at various defect percentages obtained from prediction of Flory–Rehner model are found to be in well agreement with the swelling experiment. All these results indicate that click chemistry is a powerful method to regulate the network structure and mechanical properties of the gels.Wiley2016-07-01engjournal articleAMhttp://hdl.handle.net/2115/66376https://doi.org/10.1002/polb.240280887-6266Journal of Polymer Science Part B: Polymer Physics541312271236https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/66376/6/Molecular%20Structure.pdfapplication/pdf1.08 MB2016-07-01https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/66376/5/Supporting%20Information.docxapplication/vnd.openxmlformats-officedocument.wordprocessingml.document818.5 KB2016-07-01