1. Kinetics on Acrylated Epoxideized Soybean Oil via RAFT Spring 2014 Yuerui Huang

2. Motivation  Understand what factors will influent gel time  Concentration  AESO : Solvent  2, 3, and 4  Initial free radical concentration  0.2 and 0.5 (ratio to CTA)  Structure  Different function  Fun 4  Fun 2.61  Fun 1 to 1.5 (summer plan)

3.  RAFT  Mono-function  Equal probability  Linear polymerization  Pseudo 1 st order reaction  Our system  Multi-function  Not equal probability  Not linear polymerization  Pseudo 1 st order reaction?

4. Pseudo 1 st order reaction  Pseudo 1 st order reaction

5. Assumptions  Double bonds have equal probability to react  Pseudo 1 st order reaction  Consider diffusion later  Consider structure effects later

6. Hypothesis  Ideal polymerization  Has same probability to react  Real situation  Do not have same probability to react

7.  Diffusion effect  Easier to diffuse in dilute solution  Harder to diffuse in concentrate solution

8.  Structure effect  In dilute solution, will have more structure effect  In concentrate solution, the structure effect is less

9. Procedure  Adding AESO, AIBN, CTA, and solvent in a flask  Purging Argon into the flash, in order to remove air  Put in 90 °C oil bath, let the reaction begin  Sample taking  Determine the gel time  Vortex level decreases  Stir bar stops

10. Functionality 4442.61 AIBN ratio 0.50.2 0.50.20.5 Oil:Dioxane V% 0.200.330.20 0.330.25 Ka / min^(-1) 0.01680.01070.0070.00300.00870.0138*0.0105* Gel time 43min28min145 min180min75min24min68min Gel Conversion 54.5%36.1%67.5%44.87%49.0%27.8%51.4% '*' only one set has been done Results

11. Less solvent decrease gelation time dramatically and also decrease the gelation conversion. ----- reason: diffusion limit More solvent increase gelation time and also increase gelation conversion.

12. Log [M0/M] Time / min

13. Plan  GPC. Molecular weight vs conversion  Light Scattering-GPC/THF Polymer size. Radius of Gyration

14.  Questions?