Controlled Polymerization: Modular and Versatile Spatial Functionalization of Tissue Engineering Scaffolds through Fiber-Initiated Controlled Radical Polymerization (Adv. Funct. Mater. 36/2015)

2015 ◽  
Vol 25 (36) ◽  
pp. 5718-5718
Author(s):  
Rachael H. Harrison ◽  
Joseph A. M. Steele ◽  
Robert Chapman ◽  
Adam J. Gormley ◽  
Lesley W. Chow ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Radical Polymerization ◽  
Controlled Radical Polymerization ◽  
Tissue Engineering Scaffolds ◽  
Controlled Polymerization

scholarly journals Modular and Versatile Spatial Functionalization of Tissue Engineering Scaffolds through Fiber‐Initiated Controlled Radical Polymerization

2015 ◽  
Vol 25 (36) ◽  
pp. 5748-5757 ◽  
Author(s):  
Rachael H. Harrison ◽  
Joseph A. M. Steele ◽  
Robert Chapman ◽  
Adam J. Gormley ◽  
Lesley W. Chow ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Radical Polymerization ◽  
Controlled Radical Polymerization ◽  
Tissue Engineering Scaffolds

Comparison of conventional and controlled bulk polymerization of styrene by N-methyl-2-pyrrolidone and 1-dodecanethiol

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Matjaž Krajnc ◽  
Ida Poljanšek ◽  
Blaž Likozar
Keyword(s):  
Radical Polymerization ◽  
Reaction Rate ◽  
Linear Chain ◽  
Bulk Polymerization ◽  
Chain Structure ◽  
Controlled Radical Polymerization ◽  
Proton Nuclear Magnetic Resonance ◽  
Controlled Polymerization ◽  
Exponential Factor ◽  
Polymerization System

AbstractControlled radical polymerization of styrene was initiated using Nmethyl- 2-pyrrolidone (NM2P) and 1-dodecanethiol (1DT). This polymerization system exhibited “living” characteristics, namely the molecular weight averages of resulting polymers increased linearly with conversion, which has been determined by gel permeation chromatography (GPC) analysis. The polymer was additionally characterized with Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H NMR) spectroscopy. Kinetics of controlled radical polymerization has been studied and the temperature dependency of overall polymerization rate constant has been determined. A comparison of conventional bulk radical and controlled bulk radical polymerization of styrene has been explored. Conventional radical polymerization was initiated with 2,2’-azobis(2- methylpropionitrile) (AIBN), whereas 1-dodecanethiol was applied as a chain transfer agent. The reaction rate of controlled radical polymerization was slower than the reaction rate of conventional radical polymerization initiated with AIBN. Consequentially, the activation energy and the pre-exponential factor were lower in the case of controlled polymerization in comparison to the ones observed in the conventional - AIBN initiated - system. Furthermore, by comparing the controlled to the conventional radical polymerization lower polydispersities were observed. Macromolecular structure analysis suggested a more linear chain structure in the controlled radical polymerization system. The thermal properties of polymer products have also been studied and the corresponding glass transition temperatures were higher upon comparison of the conventional and the AIBN initiated system, respectively

Aqueous RAFT at pH zero: enabling controlled polymerization of unprotected acyl hydrazide methacrylamides

2017 ◽  
Vol 8 (34) ◽  
pp. 4978-4982 ◽  
Author(s):  
Emily A. Hoff ◽  
Brooks A. Abel ◽  
Chase A. Tretbar ◽  
Charles L. McCormick ◽  
Derek L. Patton
Keyword(s):  
Radical Polymerization ◽  
Raft Polymerization ◽  
Controlled Radical Polymerization ◽  
Controlled Polymerization ◽  
Pendent Groups

A first example of controlled radical polymerization of monomers containing unprotected acyl hydrazide pendent groups was demonstrated using aqueous RAFT polymerization at pH = 0.

Novel tissue engineering scaffolds as wound dressings loaded with Alkannins/Shikonins as active ingredients

2019 ◽  
Author(s):  
AS Arampatzis ◽  
K Theodoridis ◽  
E Aggelidou ◽  
KN Kontogiannopoulos ◽  
I Tsivintzelis ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Wound Dressings ◽  
Active Ingredients ◽  
Tissue Engineering Scaffolds

HYDROXYAPATITE, ALGINATE, AND CHITOSAN FOR BONE SCAFFOLDS: SPECTROSCOPY STUDY

2016 ◽  
Vol 19 (2) ◽  
pp. 93-100
Author(s):  
Lalita El Milla
Keyword(s):  
Tissue Engineering ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Functional Groups ◽  
Bone Growth ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Tissue Engineering Scaffolds ◽  
Hydroxyapatite Powder ◽  
Materials Used

Scaffolds is three dimensional structure that serves as a framework for bone growth. Natural materials are often used in synthesis of bone tissue engineering scaffolds with respect to compliance with the content of the human body. Among the materials used to make scafffold was hydroxyapatite, alginate and chitosan. Hydroxyapatite powder obtained by mixing phosphoric acid and calcium hydroxide, alginate powders extracted from brown algae and chitosan powder acetylated from crab. The purpose of this study was to examine the functional groups of hydroxyapatite, alginate and chitosan. The method used in this study was laboratory experimental using Fourier Transform Infrared (FTIR) spectroscopy for hydroxyapatite, alginate and chitosan powders. The results indicated the presence of functional groups PO43-, O-H and CO32- in hydroxyapatite. In alginate there were O-H, C=O, COOH and C-O-C functional groups, whereas in chitosan there were O-H, N-H, C=O, C-N, and C-O-C. It was concluded that the third material containing functional groups as found in humans that correspond to the scaffolds material in bone tissue engineering.

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