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This is a presentation on MVP. Preparation and Characterization of MVP Polymers. Bill Gross, Bill Hsu, and Adel Halasa* The Goodyear Tire and Rubber Company Akron, OH.
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This is a presentation on MVP Preparation and Characterization of MVP Polymers Bill Gross, Bill Hsu, and Adel Halasa* The Goodyear Tire and Rubber Company Akron, OH
Preparation of MVP via Anionic Polymerization employing three monomers Isoprene for traction styrene for strength and butadiene for wear the catalyst system is n-BuLi and the modifier is TMEDA MVP Polymer
It is well known in the Rubber Industries that a tread rubber is a blend of two or three polymers in order to balance traction wear and RR( fuel saving) The major problem with this concept is the following. A. miscibility. B filler distribution& dispersion MVP Polymer
In this approach we are attempting to micro-engineer the molecular chain to avoid all the problems of polymer blend and filler distribution. Anionic polymerization of S/I/B ter-polymer has met this criteria MVP Polymer
The reactivity ratios of the three monomer employed in this system are dependant on the polar modifier TMEDA the r1 for Bd and r2styrene are enhanced while r3 for Isoprene is decreased thus microstructure which control the Tg is dependant of the modifier addition to the polymerization Reactivity Ratio of MVP Polymer
In this system we used Batch polymerization methods to control the MVP molecular design via the addition of TMEDA during the reaction and taking samples for analysis MVP Polymer
Symbolic MVP Polymer Chain Modifier added Low Tg (Wear) Phase mixing High Tg (Traction)
Microengineering Polymer Chain by Polymer Synthesis • Using three monomers; styrene, isoprene, and butadiene • Using polar modifiers added during the polymerization • Controlling molecular weight by catalyst concentration • Controlling microstructure by polar to catalyst ratio • Coupling polymer chains to improve the processibility • Controlling Tg by styrene concentration • Controlling Tg by isoprene microstructure
DSC of MVP Polymer 30 % -79 ºC 50 % -79 ºC -40 ºC % Conversion -80 ºC 80 % 100 % -78 ºC -78 ºC -20 ºC -19 ºC -40 -20 20 40 -60 0 -120 -100 -80 Temperature (ºC)
Physical Properties of Polymer in CB High Tan δ -20; Excellent wear, High Tan δ 0; Excellent traction, Low Tan δ 60; Excellent rolling resistance.
Blends (50/50 NR) High Tan δ -20; Excellent wear, Low Tan δ 0; Excellent traction, High Tan δ 60; Excellent rolling resistance.
Blends of MVP Polymer with 70/30 cis-PBD High Tan δ -20; Excellent wear, Low Tan δ 0; Excellent traction, High Tan δ 60; Excellent rolling resistance.
Tan Delta of MVP Polymer with Styrene Contents 20 % 30 % 10 % 0 0 -1 -1 Log Tan δ Log Tan δ -2 -2 -3 -3 -20 0 40 60 -40 20 -100 -80 -60 Temperature (ºC)
MVP/NR (50/50) 10 % Styrene 30 % Styrene 0 0 IBR 20 % Styrene -1 -1 Log Tan δ Log Tan δ -2 -2 -3 -3 -20 0 40 60 -40 20 -100 -80 -60 Temperature (ºC)
MVP/PBD (70/30) 0 0 30 % Styrene IBR 20 % Styrene 10 % Styrene -1 -1 Log Tan δ Log Tan δ -2 -2 -3 -3 -20 0 40 60 -40 20 -100 -80 -60 Temperature (ºC)
Acknowledgements • Author would like to thank Goodyear Tire and Rubber Company Management for permission to present this project. • Author would like to thank many His colleagues for their comments and suggestions.