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研究了稀土催化剂催化乙烯-丁二烯的共聚合。结果表明,在封管条件下用稀土催化剂可以使乙烯-丁二烯共聚,产生高分子量聚合物。产物的溶液性质表明,不含聚乙烯均聚物,含约8％的聚丁二烯均聚物。DSC、X-射线衍射、电子显微镜和~(13)C-NMR等实验表明,所得聚合物是含长乙烯-乙烯序列的乙烯-丁二烯共聚物,其中聚丁二烯链段的微观结构以顺-1,4构型为主。共聚物中乙烯单元增加,乙烯-乙烯链段的熔点和结晶度增高,晶粒尺寸变大,晶胞参数基本不变。共聚物的力学性能表明,其生胶强度可达20—30kg/cm~2,远比聚丁二烯的强度大。
The copolymerization of ethylene and butadiene catalyzed by rare earth catalysts was studied. The results showed that ethylene-butadiene could be copolymerized with rare earth catalyst under the conditions of sealing tube to produce high molecular weight polymer. The solution properties of the product showed no polyethylene homopolymer, containing about 8% polybutadiene homopolymer. Experiments with DSC, X-ray diffraction, electron microscopy and ~ (13) C-NMR showed that the obtained polymer was an ethylene-butadiene copolymer containing a long ethylene-ethylene sequence in which the microstructure of the polybutadiene segment To cis-1,4 configuration based. Ethylene units increased in the copolymer, the melting point and crystallinity of the ethylene-ethylene segment increased, the grain size became larger, and the unit cell parameters remained unchanged. The mechanical properties of the copolymer show that the green strength of its up to 20-30kg / cm ~ 2, far stronger than the strength of polybutadiene.