Linked Life Data

17305394

Source:http://linkedlifedata.com/resource/pubmed/id/17305394

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pubmed-article:17305394pubmed:dateCreated2007-3-12lld:pubmed
pubmed-article:17305394pubmed:abstractTextDegradable shape-memory polymer networks intended for biomedical applications were synthesized from oligo[(epsilon-hydroxycaproate)-co-glycolate]dimethacrylates with glycolate contents between 0 and 30 mol % using a photopolymerization process. In addition AB copolymer networks were prepared by adding 60 wt % n-butyl acrylate as comonomer. All synthesized polymer networks are semicrystalline at room temperature. A melting transition T(m) between 18 and 53 degrees C which can be used as switching transition for the shape-memory effect can be attributed to the crystalline poly(epsilon-hydroxycaproate) phase. At temperatures below T(m) the elastic properties are dominated by these physical cross-links. At temperatures higher than T(m) the E modulus of the amorphous polymer networks is lowered by up to 2 orders of magnitude, depending on the chemical cross-link density. Copolymer networks based on macrodimethacrylates with a M(n) of up to 13,500 g x mol(-1) and a maximum glycolate content of 21 mol % show quantitative strain recovery rates in stress-controlled cyclic thermomechanical experiments. Hydrolytic degradation experiments of polymer networks performed in phosphate buffer solution at 37 degrees C show that the degradation rate can be accelerated by increasing the glycolate content and decelerated by the incorporation of n-butyl acrylate.lld:pubmed
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pubmed-article:17305394pubmed:year2007lld:pubmed
pubmed-article:17305394pubmed:articleTitleShape-memory polymer networks from oligo[(epsilon-hydroxycaproate)-co-glycolate]dimethacrylates and butyl acrylate with adjustable hydrolytic degradation rate.lld:pubmed
pubmed-article:17305394pubmed:affiliationGKSS Research Center, Center for Biomaterial Development, Institute of Polymer Research, 14513 Teltow, Germany.lld:pubmed
pubmed-article:17305394pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:17305394pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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