In Situ Polymerization of PEGDA Foam for Bone Defects

2015 ◽  
Author(s):  
A. Forghani ◽  
L. Garber ◽  
C. Chen ◽  
R. Devireddy ◽  
J. Pojman ◽  
...  
Keyword(s):  
Adult Stem Cells ◽  
Fluorescent Dyes ◽  
In Situ Polymerization ◽  
Cell Damage ◽  
Exothermic Reaction ◽  
Glycol Diacrylate ◽  
Polymeric Scaffold ◽  
Poly Ethylene

The purpose of this study is to develop a novel bone replacement using in situ polymerization of thiol-acrylate with adipose tissue derived adult stem cells (ASCs). Specifically, Poly(ethylene glycol) diacrylate-co-trimethylolpropane tris (3-mercaptopropionate) (PEGDA-co-TMPTMP) was synthesized with 10% Hydroxyapatite (HA) foam by an amine-catalyzed Michael addition reaction. Initial characterization studies were performed to determine the temperature profile during the exothermic reaction showing a peak temperature of 50°C. To prevent hyperthermic cell damage and death during the exothermic polymerization procedure, the hASCs were encapsulated in alginate. Characterization of the 3-D structure and interconnectivity of pores in the polymeric foam scaffolds were performed using FIB-SEM and Micro-CT showing uniform distribution of HA. Cell viability experiments within the polymeric scaffold were performed using Vybrant® MTT cell profileration method, as well as fluorescent dyes: Calcein-AM (live) and Ethidium homodimer-1 (dead) showing viability of cells inside the samples.

scholarly journals In situ polymerization and characterization of graphite nanoplatelet/poly(ethylene terephthalate) nanocomposites for construction of melt-spun fibers

RSC Advances ◽  
2017 ◽  
Vol 7 (53) ◽  
pp. 33477-33485 ◽  
Author(s):  
Qiushu Xu ◽  
Chaosheng Wang ◽  
Biao Wang ◽  
Ye Chen ◽  
Huaping Wang
Keyword(s):  
Ethylene Terephthalate ◽  
In Situ Polymerization ◽  
Antistatic Property ◽  
Poly Ethylene Terephthalate ◽  
Melt Spun ◽  
Poly Ethylene ◽  
Spun Fibers

This work described a set of graphite nanoplatelet/poly(ethylene terephthalate) (GnP/PET) nanocomposites synthesized via an in situ polymerization for construction of melt-spun fibers with enhanced antistatic property.

Synthesis and Characterization of Poly(Ethylene Terephthalate) /Al2O3 Nanocomposites

2013 ◽  
Vol 717 ◽  
pp. 54-57 ◽  
Author(s):  
Sang Kyoo Lim ◽  
Won Mi Choi ◽  
Hyun Jung Choi ◽  
Seong Hui Hong ◽  
Sung Ho Hwang ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Ethylene Terephthalate ◽  
In Situ Polymerization ◽  
Synthesis And Characterization ◽  
Melting Temperatures ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Lower Melting Temperature

Poly (ethylene terephthalate)(PET)/Al2O3nanocomposites via in situ polymerization were studied. The nanoparticle loading was varied from 0.3 to 1 wt.%. From the DSC results, no significant differences were recorded for melting temperatures. However, simple added PET/Al2O3nanocomposites slightly changed to the lower melting temperature. Morphology of the nanocomposites has been examined by SEM. From the SEM results revealed that dispersed Al2O3nanoparticles in the EG (ethylene glycol) during the polymerization can be well dispersed in PET matrix.

scholarly journals Bio-based polyurethane nanocomposite thin coatings from two comparable POSS with eight same vertex groups for controlled release urea

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lixia Li ◽  
Meng Wang ◽  
Xiandong Wu ◽  
Wenping Yi ◽  
Qiang Xiao
Keyword(s):  
In Situ Polymerization ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Poly Ethylene Glycol ◽  
Thin Coatings ◽  
Polyurethane Coatings ◽  
Coated Urea ◽  
Poly Ethylene ◽  
Coated Fertilizer ◽  
Polyurethane Matrix

AbstractNanocomposite modification has attracted much attention in improving properties of bio-based polymer coating material for coated fertilizer. Herein two comparable polyhedral oligomeric silsesquioxanes (POSS), with eight poly(ethylene glycol) (PEG) and octaphenyl groups attached to the cage, respectively, were successfully incorporated into thin castor oil-based polyurethane coatings via in-situ polymerization on the urea surface. The nanostructure coatings are environmentally friendly, easy to prepare, and property-tunable. The results show that the vertex group of POSS had a pronounced influence on dispersion level and interaction between polyurethane and POSS that well-tuned the release pattern and period of coated urea, even at the coating rate as low as of 2 wt%. The liquid POSS with long and flexible PEG groups had better compatibility and dispersibility in polyurethane matrix than the solid POSS with rigid octaphenyl groups, as evidenced by SEM/EDS. The unique properties were resulted from the different extents of physical crosslinkings. This modification of bio-based polyurethane coating with POSS provided an alternative method of regulating and controlling the properties of coated fertilizer.

scholarly journals In Situ Dielectric Characterization of Poly(ethylene oxide) Melts Containing Lithium Perchlorate under Steady Shear Flow

2004 ◽  
Vol 37 (18) ◽  
pp. 7064-7064
Author(s):  
Yumi Matsumiya ◽  
Nitash P. Balsara ◽  
John B. Kerr ◽  
Tadashi Inoue ◽  
Hiroshi Watanabe
Keyword(s):  
Shear Flow ◽  
Ethylene Oxide ◽  
Lithium Perchlorate ◽  
Dielectric Characterization ◽  
Steady Shear Flow ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Oxide Melts
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