【摘要】 本文研究了氯乙烯种子乳液聚合中种子的用量、平均粒径和粒径分布对聚合物粒子大小及分布的影响。按照氯乙烯乳液聚合中自由基从聚合物粒子的解吸和再吸的概念,提出种子对聚合物粒子大小与分布影响的关键在于种子粒子的总表面积。结果表明,当种子粒径增加和种子用量减少时,聚合物粒径并不随之增加。因此,为了得到适当的粒径和分布的聚合物粒子,种子用量不应减少,通常为单体重量的3—5%。更多还原

【Abstract】 In the emulsion polymerization process whether the problem about the average seed size, the size distribution and the seed amount used will exert any action on the average size as well assize distribution of the final polymer particles formed has beed studied.Considering from the concept in respect to desorption and resorption of the free radicals from the polymers in vinyl chloride emulsification polymerization process, it is be lieved that the major controlling factor on the particle size and its distribution depends most likely upon the magnitude of the total external surface of the seed particles. Experimental results show that either the increase of the average seed size or the decrease of the quantity of the seed used gives no sensible increase of the particle size of the polymer particle formed. Hence, in order to have an appropriate particle size as well as the desired size distribution, seed quantity used should not be decreased and, in general, it should take the amount about 3—5% of the total amount of the monomer used by weight.更多还原