Chemistry · Ch 15 — Introduction to Polymer Chemistry
Buna-S rubber
Buna-S rubber
Buna-S, also known by its trade name SBR (styrene-butadiene rubber), is an elastomer that is a copolymer of styrene with 1,3-butadiene (Fig. 15.5), usually made from about 75 parts butadiene and 25 parts styrene, polymerized together by addition polymerization using sodium as the catalyst, and subsequently vulcanized with sulfur like natural rubber. Buna-S is superior to natural rubber in mechanical strength and abrasion resistance, which is …
Drawn by us to help you understand the concept clearly, and verified to make sure it's accurate. For exams, practice from your textbook's own diagram.
What this figure shows. A reaction scheme showing 1,3-butadiene (CH2=CH-CH=CH2, 75%) copolymerizing with styrene (C6H5-CH=CH2, 25%) by addition polymerization to give the SBR repeating chain, drawn as an alternating/random sequence of a butadiene-derived unit (-CH2-CH=CH-CH2-) and a styrene-derived unit bearing a phenyl (C6H5) side group (-CH2-CH(C6H5)-), repeated along the polymer backbone -- illustrating the random copol …