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• W2018130015 abstract "Poly(lactide)-block-poly(ethylene oxide)-block-poly(lactide) (PLA-PEO-PLA) triblock copolymers are known to form physical hydrogels in water as a result of the polymer’s amphiphilicity. Their mechanical properties, biocompatibility, and biodegradability have made them attractive for use as soft tissue scaffolds. However, the network junction points are not covalently cross-linked, and in a highly aqueous environment these hydrogels adsorb more water, transform from gel to sol, and lose the designed mechanical properties. In this article, a hydrogel was formed by the use of a novel two-step approach. In the first step, the end-functionalized PLA-PEO-PLA triblock was self-assembled into a physical hydrogel through hydrophobic micelle network junctions, and in the second step, this self-assembled physical network structure was locked into place by photo-cross-linking the terminal acrylate groups. In contrast with physical hydrogels, the photo-cross-linked gels remained intact in phosphate-buffered solution at body temperature. The swelling, degradation, and mechanical properties were characterized, and they demonstrated an extended degradation time (∼65 days), an exponential decrease in modulus with degradation time, and a tunable shear modulus (1.6−133 kPa). We also discuss the various constitutive relationships (Hookean, neo-Hookean, and Mooney−Rivlin) that can be used to describe the stress−strain behavior of these hydrogels. The chosen model and assumptions used for data fitting influenced the obtained modulus values by as much as a factor of 3.5, which demonstrates the importance of clearly stating one’s data fitting parameters so that accurate comparisons can be made within the literature." @default.
• W2018130015 created "2016-06-24" @default.
• W2018130015 creator A5011664687 @default.
• W2018130015 creator A5037860291 @default.
• W2018130015 creator A5086363084 @default.
• W2018130015 date "2008-09-26" @default.
• W2018130015 modified "2023-10-18" @default.
• W2018130015 title "Photo-Cross-Linked PLA-PEO-PLA Hydrogels from Self-Assembled Physical Networks: Mechanical Properties and Influence of Assumed Constitutive Relationships" @default.
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• W2018130015 doi "https://doi.org/10.1021/bm800557r" @default.
• W2018130015 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4251597" @default.
• W2018130015 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18817440" @default.
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