天然橡胶的相对分子质量及其分布

Relative molecular mass and its distribution of natural rubber

采用凝胶渗透色谱研究了天然橡胶(NR)、只含磷脂的NR脱蛋白胶(DPNR)及既不含磷脂又不含蛋白质的NR脱蛋白脱磷脂胶(TE-DPNR)的相对分子质量及其分布。结果表明,NR中存在通过磷脂形成的支化链分子。加入极性溶剂会降低DPNR的相对分子质量,说明DPNR中的大部分支化点可能是由磷脂之间形成的氢键。DPNR胶乳中小粒径橡胶粒子中的分子基本为线型分子,而大粒径橡胶粒子中的分子为支化分子。

Gel permeation chromatography （ GPC ） was used to determine the relative molecular mass and its distribution of natural rubber （NR） , depro- teinized natural rubber（DPNR） and transesterifica- ted-deproteinized natural rubber （TE-DPNR）. The results showed that the branching chain molecular formed from phospholipid exited in NR. The relative molecular mass of DPNR decreased by the addition of polar solvent, which implied that most of the branching point might be the hydrogen bonds formed between phospholipids. Most of the molecules in small rubber particles of DPNR emulsion were linear molecules, while molecules in large rubber particles were branched molecules.