1. Polymer blends High Vinyl PBD/high Cis PI
Adel Halasa
The University of Akron
College of Polymer science

2. Blends Natysen Goodyear high cis PI Nadenic Goodyear high cis PBD
Synthetic High Vinyl PBD with varying microstructures

3. Outline Synthesis of HVPBD Miscibility Study Thermal Stability
Conclusions

4. HVPBD

5. HVPBD

6. HVPBD

7. HVPBD

8. Polymer Blends HVPBD/Natsyn(Cis PI) PBD/Natsyn (Cis PI)
To investigate the miscibility of polymer blends
HVPBD/Natsyn(Cis PI)
PBD/Natsyn (Cis PI)
Prepare blends with different compositions
DSC characterization
RPA and DMA characterization
TEM

9. HVPBD

10. Natysen(Cis PI)

11. Glass Transition Temperature of Natysen (Cis PI)/HVPBD

12. Cis PI HVPBD

13. Natysen(cisPI)/HVPBD

14. Bud 1207(Cis 1,4-Butadiene)

15. HVPBD/Bud 1207(Cis 1,4-Butadiene) Blends: 50/50

16. HVPBD/Bud 1207(Cis 1,4-Butadiene) Blends:30/70

17. HVPBD/Bud 1207(Cis 1,4-Butadiene) Blends
RPA at 100C

18. HVPBD/Bud 1207(Cis 1,4-Butadiene) Blend
RPA at 100C

22. TGA of Synthetic high Cis PI(Natsyn)

23. TGA of HVPBD

24. HVPBD( )

25. TGA of Natsyn/HVPBD: 50/50

26. TGA of Natsyn/HVPBD:70/30

27. TGA Measurements

28. TGA of Nadenic cisPBD)

29. TGA of Natsyn/Nadenic:50/50

30. TGA overlays at 50/50

31. TGA Overlay at 70/30

32. MVPBD( )

33. Natsyn/MVPBD

34. Physical Properties LVPBD (10-30% 1,2, Tg between -70 and-85 C):
Good wear
Excellent fuel economy
Poor traction
HVPBD (75-90% 1,2, Tg between -10 and -30C):
Poor wear?
Good traction
High thermal stability

35. Conclusions
HVPBD enhances the thermal stability of(cisPI) Natsyn. The improvement of the heat resistance was proportional to the amount of high vinyl polybuatdiene added.
The onset decomposition temperatures of a 70/30 Natsyn/HVPBD blend is 363 0C and that of a 50/50 blend is 381 0C compared to 3130C for pure Natsyn. This illustrates an increase of more than 40 0C in the thermal stability of Natsyn.
The Natsyn and HVPBD polymer blends combine low glass transition temperatures and high thermal stability, which is highly suitable in tire applications especially where heat resistance is needed.
NR/HVPBD can be tested for Sidewalls of truck and passenger tires due to their superior thermal stability relatively to natural rubber and high cis 1,4-polybutadiene. Flex fatigue should be investigated
Measurements of of Natural rubber/HVPBD containing (cis PBD) Nadenic is in progress.

36. Conclusions of the Compounding study
HVPBD blended with Natural rubber in TA037 did improve reversion resistance
Hot rebound and Tan Delta did not show an increase in compound hysteresis at HVPBD levels up to phr
Tear resistance of TA037 drops as the HVPBD amount increases. The tear values with up to 30phr of HVPBD are high enough for use in drive tire treads.