@article{BehlRazzaqMazurekBudzynskaetal.2020,
  author    = {Behl, Marc and Razzaq, Muhammad Yasar and Mazurek-Budzynska, Magdalena and Lendlein, Andreas},
  title     = {Polyetheresterurethane based porous scaffolds with tailorable architectures by supercritical CO2 foaming},
  series = {MRS advances},
  volume    = {5},
  journal   = {MRS advances},
  number    = {45},
  publisher = {Cambridge University Press},
  address   = {New York, NY},
  issn      = {2059-8521},
  doi       = {10.1557/adv.2020.345},
  pages     = {2317 -- 2330},
  year      = {2020},
  abstract  = {Porous three-dimensional (3D) scaffolds are promising treatment options in regenerative medicine. Supercritical and dense-phase fluid technologies provide an attractive alternative to solvent-based scaffold fabrication methods. In this work, we report on the fabrication of poly-etheresterurethane (PPDO-PCL) based porous scaffolds with tailorable pore size, porosity, and pore interconnectivity by using supercritical CO2(scCO(2)) fluid-foaming. The influence of the processing parameters such as soaking time, soaking temperature and depressurization on porosity, pore size, and interconnectivity of the foams were investigated. The average pore diameter could be varied between 100-800 mu m along with a porosity in the range from (19 +/- 3 to 61 +/- 6)\% and interconnectivity of up to 82\%. To demonstrate their applicability as scaffold materials, selected foams were sterilized via ethylene oxide sterilization. They showed negligible cytotoxicity in tests according to DIN EN ISO 10993-5 and 10993-12 using L929 cells. The study demonstrated that the pore size, porosity and the interconnectivity of this multi-phase semicrystalline polymer could be tailored by careful control of the processing parameters during the scCO(2)foaming process. In this way, PPDO-PCL scaffolds with high porosity and interconnectivity are potential candidate materials for regenerative treatment options.},
  language  = {en}
}
@article{MazurekBudzynskaRazzaqBehletal.2019,
  author    = {Mazurek-Budzynska, Magdalena and Razzaq, Muhammad Yasar and Behl, Marc and Lendlein, Andreas},
  title     = {Shape-Memory Polymers},
  series = {Functional Polymers},
  journal   = {Functional Polymers},
  publisher = {Springer},
  address   = {Cham},
  isbn      = {978-3-319-95987-0},
  issn      = {2510-3458},
  doi       = {10.1007/978-3-319-95987-0_18},
  pages     = {605 -- 663},
  year      = {2019},
  abstract  = {Shape-memory polymers (SMPs) are stimuli-sensitive materials capable of changing their shape on demand. A shape-memory function is a result of the polymer architecture together with the application of a specific programming procedure. Various possible mechanisms to induce the shape-memory effect (SME) can be realized, which can be based on thermal transitions of switching domains or on reversible molecular switches (e.g., supramolecular interactions, reversible covalent bonds). Netpoints, which connect the switching domains and determine the permanent shape, can be either provided by covalent bonds or by physical intermolecular interactions, such as hydrogen bonds or crystallites. This chapter reviews different ways of implementing the phenomenon of programmable changes in the polymer shape, including the one-way shape-memory effect (1-W SME), triple-and multi-shape effects (TSE/ MSE), the temperature-memory effect (TME), and reversible shape-memory effects, which can be realized in constant stress conditions (rSME), or in stress-free conditions (reversible bidirectional shape-memory effect (rbSME)). Furthermore, magnetically actuated SMPs and shape-memory hydrogels (SMHs) are described to show the potential of the SMP technology in biomedical applications and multifunctional approaches.},
  language  = {en}
}
@article{PengBehlZhangetal.2018,
  author    = {Peng, Xingzhou and Behl, Marc and Zhang, Pengfei and Mazurek-Budzynska, Magdalena and Feng, Yakai and Lendlein, Andreas},
  title     = {Synthesis of Well-Defined Dihydroxy Telechelics by (Co)polymerization of Morpholine-2,5-Diones Catalyzed by Sn(IV) Alkoxide},
  series = {Macromolecular bioscience},
  volume    = {18},
  journal   = {Macromolecular bioscience},
  number    = {12},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1616-5187},
  doi       = {10.1002/mabi.201800257},
  pages     = {11},
  year      = {2018},
  abstract  = {Well-defined dihydroxy telechelic oligodepsipeptides (oDPs), which have a high application potential as building blocks for scaffold materials for tissue engineering applications or particulate carrier systems for drug delivery applications are synthesized by ring-opening polymerization (ROP) of morpholine-2,5-diones (MDs) catalyzed by 1,1,6,6-tetra-n-butyl-1,6-distanna-2,5,7,10-tetraoxacyclodecane (Sn(IV) alkoxide). In contrast to ROP catalyzed by Sn(Oct)(2), the usage of Sn(IV) alkoxide leads to oDPs, with less side products and well-defined end groups, which is crucial for potential pharmaceutical applications. A slightly faster reaction of the ROP catalyzed by Sn(IV) alkoxide compared to the ROP initiated by Sn(Oct)(2)/EG is found. Copolymerization of different MDs resulted in amorphous copolymers with T(g)s between 44 and 54 degrees C depending on the molar comonomer ratios in the range from 25\% to 75\%. Based on the well-defined telechelic character of the Sn(IV) alkoxide synthesized oDPs as determined by matrix-assisted laser desorption/ionization time of flight measurements, they resemble interesting building blocks for subsequent postfunctionalization or multifunctional materials based on multiblock copolymer systems whereas the amorphous oDP-based copolymers are interesting building blocks for matrices of drug delivery systems.},
  language  = {en}
}