2-Mercaptoimidazoline/6-Ethoxy-2, 2, 4-trimethyl-1, 2-dihydroquinoline/N-Isopropyl-N′-Phenyl-p-Phenylenediamine/Polymerized 2, 2, 4-tritnethyl-1, 2-dihydroquinoline/Testing Methods for Synthetic Rubber BR