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首页> 外文期刊>Journal of Applied Polymer Science >Modification of Cellulose Powder Surface by Grafting of Polymers with Controlled Molecular Weight and Narrow Molecular Weight Distribution
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Modification of Cellulose Powder Surface by Grafting of Polymers with Controlled Molecular Weight and Narrow Molecular Weight Distribution

机译：通过控制分子量和窄分子量分布的聚合物的接枝改性纤维素粉末表面

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摘要

To modify cellulose powder surface, the grafting of polymers with controlled molecular weight and narrow molecular weight distribution onto the surface by the termination of living polymer cation with amino groups introduced onto cellulose powder surface was investigated. The introduction of amino groups onto cellulose powder surface was achieved by the treatment of cellulose powder with isatoic anhydride. It was found that cellulose powder having amino groups are readily reacted with living poly(2-methyl-2oxazoline)(polyMeOZO) cation, which was generated by ring-opening polymerization with methyl p-toluenesulfonate as an initiator, and polyMeOZO with controlled molecular weight and narrow molecular weight distribution was grafted onto the surface. By the termination of living poly(isobutyl vinyl ether)(polyIBVE), whcih was generated by the polymerization with HCl/ZnCl_2 initiating system, with amino groups on cellulose powder, polyIBVE was also grafted onto the surface. The mole number of grafted polymer chain on cellulose powder surfaces decreased with increasing molecular weight of the living polymer cation, because of increasing steric hindrance with increasing molecular weight of living polymer cation. Wettability of cellulose powder surface to water was found to be controlled by grafting of hydrophilic or hydrophobic polymer onto the surface.
机译：为了改性纤维素粉末表面，研究了通过将活性高分子阳离子与引入到纤维素粉末表面上的氨基终止而将具有受控分子量和窄分子量分布的聚合物接枝到表面上的方法。通过用等角酸酐处理纤维素粉末，将氨基引入纤维素粉末表面。已发现具有氨基的纤维素粉末容易与活性聚（2-甲基-2-恶唑啉）（polyMeOZO）阳离子反应，该阳离子是通过对甲苯磺酸甲酯作为引发剂通过开环聚合和具有受控分子量的polyMeOZO而产生的窄分子量分布被接枝到表面上。通过终止活性聚（异丁基乙烯基醚）（polyIBVE），通过与HCl / ZnCl_2引发体系的聚合反应生成了纤维素，其中纤维素基团上带有氨基，也将聚IBVE接枝到了表面上。纤维素粉末表面上的接枝聚合物链的摩尔数随着活性高分子阳离子的分子量的增加而降低，这是因为随着活性高分子阳离子的分子量的增加，位阻增加。发现纤维素粉末表面对水的润湿性是通过将亲水或疏水聚合物接枝到表面上来控制的。

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