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Polybutadiene
Polybutadiene is a synthetic rubber polymerized from the monomer 1,3-butadiene. It was first synthesized in 1910 and accounts for about a quarter of global synthetic rubber production, with around 70% used in tire manufacturing. Polybutadiene can be produced through various polymerization methods and processed through techniques like injection molding. It has good abrasion resistance and flexibility but poor resistance to oil and gasoline. Research articles discussed using sepiolite nanofibers to improve the mechanical properties of polybutadiene rubber composites and emulsion polymerization methods to synthesize polybutadiene nanoparticles. In conclusion, polybutadiene will continue to be widely used in tires and other applications due to its
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Polybutadiene
- 1. POLYBUTADIENE Mohsin Hussain M14-341 5th Semester(Morning) College of Engineering & Emerging Technologies University of the Punjab
- 2. OBJECTIVES • Whatis Polybutadiene? • Monomer & polymerization method • Processing techniques & types • Properties • Applications • Research articles • Conclusion
- 3. INTRODUCTION In1910 , it was firstly polymerized by a Russian chemist named Sergei Lebedev. Polybutadiene is an elastomeric synthetic rubber and a homopolymer of 1,3 Butadiene monomer. Due to it’s high abrasion(wear) resistance, it is accounted for approximately a quarter of total consumption of synthetic rubber in 2012. About 70 % of this polymer is used in the manufacturing of tires and rest of it used to increase the mechanical strength of plastics and other polymers. Monomer Molecular Formula C4H6
- 4. Polymerization reaction Polymerizationmethods Grades of BR Free Radical Cationic & Anionic Coordinatio n LiBR BR- 1243 Nd CoBR NdBR BR- 1203 Ti
- 5. Types Processingtechniques of BR • Global production of butadiene reached 10 million metric tones (20.4 billion pounds) in 2011. High Cis Polybutadiene Low Cis Polybutadiene High Trans Polybutadiene Lithium based Polybutadiene Metallocene Polybutadiene High Vinyl Polybutadiene Injection Molding Compression Molding Transfer Molding Extrusion Solution Polymerization
- 6. Physical Properties Limitations Meltingpoint 124-156 ºC Hardness 45-80 shore A Tg <-95 ºC Td Above 300ºC Crystallinity 18.6 % Elongation 450 % Abrasion resistance Good Chemical resistance Excellent Density 0.6145 g/cm³ Mn >100,000 g/mol Poor resistance to oil and gasoline Minor resistant to heat Difficult to process Prone to ozone cracking
- 7. COMMERCIAL AVAILABILITYOF BR • Global demand and usage of BR • World consumption of BR in 2015 • Available in the form of gas but stored and used in pressurized liquefied form.
- 8. APPLICATIONS ANDUSES • Tire production (SBS) • Conveyor belt • Water hoses • Gaskets • Golf ball & super ball • Engine belt • As fuel in space shuttle for boosting rockets
- 9. Sepiolite isa porous mineral exist in the form of fibers and prepared by dry flow method. Average diameter of sepiolite is less than 100 nm. Coupling agents like NDZ-201 (Isopropyl tri (dioctylphosphate) titnate) and KH-560 (ᵞ-(2,3 epoxypropoxy) propyltrimethoxysilane) are used with Cis-PBR as fillers . Dumbbell shape samples were prepared and tested under at UTTM. From study, NDZ-201 had best tearing strength but low tensile strength whereas KH-560 had best tearing strength as well as best tensile strength. Therefore KH-560 was considered an optimal coupling agent as in the given graph at 7% it shows maximum tensile strength. Application Sepiolite increases the mechanical strength of Cis- PBR. Author Fei Wang, Lei Feng and Haifeng Liu Journal Journal of Nanomateri als Issue Date November 2013 Effect of modified sepiolite nanofibers on properties of cis- polybutadiene rubber composite nanomaterials
- 10. • In thepresence of potassium persulfate, disproportionate rosinate potassium emulsifiers and t- dodecyl mercaptane as initiator for polymerization. • Conversions were measured at different temp. (60,70 or 80ºC) by gravimetry method. • Particle size was calculated through DLS and polymer microstructure through FTIR. • By increasing temp. diameter of PB nanoparticles decreased from 104 nm at 60ºC to 88.7 nm at 80ºC. • Microstructure of synthesized polymers was calculated to about 60%. • Result By increasing reaction temp. size of particles decreased while the polymerization rate increased. Synthesis of Polybutadiene Nanoparticles via Emulsion Polymerization Author Mohammad Reza Yosoufi and Parisa Alamdari Journal Oil, Gas and Petrochemic al Technology Issue Date December 2013 Vol 1
- 11. CONCLUSION Polybutadiene isand will continue to be a high volume rubber for use in tires, toughened plastics, and golf balls due to its low cost, availability and unique properties. As new markets develop, there will be a need to develop new, higher performance grades of BR. Thankyou for listening :D Keep Calm and Don’t ask any Question