John A. Pojman

An Introduction to Nonlinear Chemical Dynamics: Oscillations, Waves, Patterns, and Chaos

Part I: Overview 1. Introduction - A Bit of History 2. Fundamentals 3. Apparatus 4. Chemical Oscillations: Synthesis 5. Chemical Oscillations: Analysis 6. Waves and Patterns 7. Computational Tools Part II: Special Topics 8. Complex Oscillations and Chaos 9. Transport and External Field Effects 10. Delays and Differential Delay Equations 11. Polymer Systems 12. Coupled Oscillators 13. Biological Oscillators 14. Turing Patterns 15. Stirring and Mixing Effects Appendix I Demonstrations A1.1 The Briggs-Rauscher Reaction A1.2 The Belousov-Zhabotinsky Reaction A1.3 BZ Waves A1.4 A Propagating pH Front Appendix 2 Experiments for the Undergraduate Lab A2.1 Frontal Polymerization A2.2 Oscillations in the Homogeneous Belousov-Zhabotinsky Reaction A2.3 Unstirred BZ System: Measuring Rate Constants with a Ruler Bibliography

Nonlinear dynamics with polymers : fundamentals, methods and applications

Introduction What is Nonlinear Dynamics and how does it relate to Polymers? NonNewtonain Rheology of Polymers Frontal Polymerization Phase Separating systems Gels Coupled to Oscillatory Reactions Instabilities created by Interaction with Gels Oscillatory Systems Created with Polymer membrane Isothermal Frontal Polymerization Instabilities in inorganic polymer growth Biopolymers

Nonlinear Chemical Dynamics In Synthetic Polymer Systems

The application of the methods of nonlinear chemical dynamics to synthetic polymer systems is considered. We review the differences between polymers and inorganic systems that have been the subject of nonlinear dynamics. We consider two methods for approaching the problem — coupling polymers to other nonlinear systems and using inherent nonlinear behavior of polymers. We specifically focus on frontal polymerization.

In Situ Polymerization of PEGDA Foam for Bone Defects

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.Copyright