【摘要】 通过对落叶松栲胶进行亚硫酸盐和氢氧化钠的改性,测定其溶液黏度,用不同溶剂进行分级和薄层色谱。结果表明改性栲胶溶液黏度下降,相对分子质量降低且分布集中。高度亚硫酸化的改性落叶松栲胶相比碱处理的改性落叶松栲胶更有效地降低其黏度和相对分子质量。可应用于酚醛树脂绝缘板的黏合剂生产。更多还原

【Abstract】 This paper illustrates the reaction of larch bark tannin extracts with sulfite and sodium hydroxide and the tests of its solution viscosity, MW-distribution and thin-layer chromatography. It shows that the solution viscosity drops and the relative molecular mass reduces with narrow distribution. The high sulfitated larch bark tannin extracts are more available to decrease the solution viscosity than the alkali treated extracts. The modified larch bark tannin extracts can be used in production of bakelite bond.更多还原