title: Preparation of flexible and elastic poly(trimethylene carbonate) structures by stereolithography.
abstract: 3D porous and non-porous structures are designed and prepared by stereolithography using resins based on PTMC macromers. Tough, flexible network films prepared in this manner show E moduli of ≈3.8 MPa and high elongations at break >900%; tensile strengths are ≈4.2 MPa. These values increase with increasing PTMC macromer molecular weight. To reach suitable viscosities for processing, up to 45 wt% propylene carbonate is added as non-reactive diluent. The solid specimens have compression moduli of 3.1-4.2 MPa, similar to the values determined in tensile testing. The built porous structures show porosities of 53-66% and average pore sizes of 309-407 µm. The compression moduli of the porous structures are significantly lower than those of the solid structures.
authors: MIRA Institute for Biomedical Engineering and Technical Medicine, and Department of Biomaterials Science and Technology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands.
authors: Sigrid
authors: S
authors: Schüller-Ravoo
authors: Jan
authors: J
authors: Feijen
authors: Dirk W
authors: DW
authors: Grijpma
mesh_terms: D001672:Biocompatible Materials / Q000032:analysis / Q000138:chemical synthesis*; D004146:Dioxanes / Q000032:analysis / Q000138:chemical synthesis*; D055119:Elastic Modulus; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D008970:Molecular Weight; D055668:Photochemical Processes; D011108:Polymers / Q000032:analysis / Q000138:chemical synthesis*; D016062:Porosity; D011407:Propane / Q000031:analogs & derivatives / Q000737:chemistry; D013718:Tensile Strength; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds; D014783:Viscosity
chemical_list: D001672:Biocompatible Materials; D004146:Dioxanes; D011108:Polymers; C059299:polytrimethylene carbonate; C045990:propylene carbonate; D011407:Propane