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通常羧酸树脂提取链霉素时必须进行H-Na式变换,体积胀缩一倍,易致破碎,寿命不长,而且需要采用允许胀缩之设备及逆流操作设施,羧酸树脂之溶胀行为是其主要原因。溶胀行为来源于高分子固有特性高弹态,刚性高分子仅在玻璃态化温度以上或溶剂存在下始呈高弹态。故憎水性刚性高分子在水中常温下决不表现高弹态,因此其刚性足以对抗羧基中和时引起之渗透压变化,而产生之张力时无溶胀行为,而树脂须疏松多孔才能吸附链霉素分子(分子量581)。我们选交联聚苯乙烯为刚性骨架,接枝聚甲基丙
Usually carboxylic acid resin extraction of streptomycin must be H-Na-type conversion, volume expansion and contraction double, easy to cause broken, short life expectancy, and the need to allow expansion and contraction of equipment and counter-current operating facilities, the swelling behavior of carboxylic acid resin Is the main reason. The swelling behavior comes from the inherent elastic properties of polymer. The rigid polymer shows a high elastic state only above the glass transition temperature or in the presence of solvent. Therefore, the water-repellent rigid polymer in the water at room temperature will never show a high-elastic state, so its rigidity is sufficient to resist the change of the osmotic pressure caused by the neutralization of the carboxyl group, and the resulting tension does not swell, and the resin must be porous to adsorb the streptomyces Supramolecular (molecular weight 581). We choose cross-linked polystyrene as a rigid skeleton, graft polymethyl