| 摘要 |
Syndiotactic 1,2-polybutadiene can be blended with various rubbers in order to improve the properties thereof. For instance, syndiotactic 1,2-polybutadiene can be blended with rubbers utilized in making tire treads in order to improve the heat build-up and wear characteristics of tires. The interaction and adhesion between syndiotactic 1,2-polybutadiene and rubbers can be improved by carboxylating the syndiotactic 1,2-polybutadiene. The presence of carboxylic acid groups on the syndiotactic 1,2-polybutadiene also greatly improves interaction with fillers commonly utilized in rubber compounding, such as carbon black. This invention discloses a process whereby syndiotactic 1,2-polybutadiene can be easily and inexpensively carboxylated. This invention more specifically discloses a method for preparing carboxylated syndiotactic 1,2-polybutadiene which comprises: (1) reacting syndiotactic 1,2-polybutadiene with hydrogen and carbon monoxide in an organic medium to produce formyl syndiotactic 1,2-polybutadiene, wherein the syndiotactic 1,2-polybutadiene is in the form of small particles having a particle size of less than about 250 microns which are suspended in the organic medium; and (2) reacting the formyl syndiotactic 1,2-polybutadiene with oxygen to produce the carboxylated syndiotactic 1,2-polybutadiene.
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