通过丁烯和异戊二烯的共聚作用化合而成的一种合成橡胶，几乎不透空气，用作轮胎、内管道和绝缘等的材料中。
A synthetic rubber produced by copolymerization of a butylene with isoprene, nearly impermeable to air and used in tires, inner tubes, and insulation.
鉴于上述结果，作者认为头发黑素可能是由不含硫的氨基酸和含硫氨基酸通过复杂的氧化作用和共聚作用生成的无规则聚合物。
The above results suggest that hair melanin iss complex random polymer, formed by a very complicated process of oxidation and copolymerization of both sulfur-containing and non-sulfur amino acids.
酯化处理所产生的接触角增大作用要比接枝共聚所产生的作用大；
The effect of the esterification on contact angle is obviously bigger than that of graft copolymerization.
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