• Effects of catalyst FeSO_(4) on molecular mass distribution, contents of carboxyl and carbonyl groups, and adhesive properties of the oxidized starches were investigated.

    考察催化剂硫酸亚铁对氧化木薯淀粉绝对分子量及其分布羧基羰基含量以及其胶粘性能影响

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  • Polytetrahydrofuran (PTHF) with narrow molecular mass distribution was prepared by cationic ring-opening polymerization of tetrahydrofuran using H_2SO_4 · SO_3-HClO_4 system as a catalyst.

    发烟硫酸-高氯酸为催化剂通过四氢呋喃阳离子开环聚合合成了分子量分布的聚四氢呋喃(PTHF)。

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  • When polymer relative molecular mass and its distribution width are the same, the polymer displacement efficiency increases with the increment of the core permeability variation factor.

    聚合物相对分子质量及其分布宽度同时随着岩心渗透率变异因数的增大聚合物采收率也随之增加

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  • It shows that the solution viscosity drops and the relative molecular mass reduces with narrow distribution.

    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。

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  • The polyether polyols prepared by these DMC catalysts are of low unsaturation, high relative molecular mass, narrow molecular distribution compared with traditional KOH catalysts.

    实验发现,DMC催化剂合成与用KOH催化剂合成的聚醚相比不饱和度相对分子质量,相对分子质量分布

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  • The variation of relative molecular mass and its distribution in the process of SBR and PS (HIPS) were determined by gel permeation chromatograph (GPC).

    使用凝胶渗透色谱仪(GPC)测定苯橡胶(SBR)聚苯乙烯(PS高冲聚苯乙烯(HIPS不同生产工艺条件下相对分子质量及其分布变化

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  • The effects of initiators and thermal initiation on a reaction rate, molecular weight and molecular weight distribution of products in a mass polymerization of styrene were investigated.

    考察引发方式不同种类、浓度下引发剂引发方式苯乙烯本体聚合对聚合反应速率产品分子量及其分子量分布的影响。

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  • The molecular weight distribution of the product provided by the present invention is narrower than the product provided by the mass polymerization.

    发明所得产品分子分布本体聚合所得者狭窄。

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  • Submicron particles dominated the size distribution of PAHs mass, and higher molecular weight PAHs tend to distribute in finer particles and could be more dangerous to human health.

    多环芳烃主要分布微米颗粒上,分子量越大的多环芳烃越趋于富集在颗粒上,因而健康危害越大。

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  • Submicron particles dominated the size distribution of PAHs mass, and higher molecular weight PAHs tend to distribute in finer particles and could be more dangerous to human health.

    多环芳烃主要分布微米颗粒上,分子量越大的多环芳烃越趋于富集在颗粒上,因而健康危害越大。

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