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首页> 外文期刊>Journal of Applied Polymer Science >Solubility of Additives: Grafting of Itaconic Acid onto LDPE by Reactive Extrusion. II. Effect of Stabilizers
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Solubility of Additives: Grafting of Itaconic Acid onto LDPE by Reactive Extrusion. II. Effect of Stabilizers

机译：添加剂的溶解度：通过反应挤出将衣康酸接枝到LDPE上。二。稳定剂的作用

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摘要

Static and dynamic mixers set on the Brabender plastograph were used to investigate the grafting of itaconic acid (LA) onto low-density polyethylene (LDPE) by the reactive extrusion. The initiators of free-radical reactions were monoperoxide 2,5-dimethyl-2-hydroxy-5-tert-butylperoxy-3-hexyne and diperoxide 2,5-dimethyl-2,5-dimethyl-2,5-di(tert-butyl peroxy)-hexane. The reaction mix contained stabilizers of phenolic type as follows: 2,6-ditert-butyl-4-methyl phenol; ester of 3,5-ditert-butyl-4-hydroxyphenyl-propanoic acid and pentaerythritol; 4-alkoxy-2-hydroxy-benzophenone; and 1,4-dihydroxybenzene. The effect of stabilizers, which follow the radical mechanism on the grafting of LA and on the crosslinking, depends on their solubility in the polymer and the monomer. The stabilizers (e.g., 1,4-dihydroxybenzene) with increased affinity toward the monomer reduce the grafting yield and inhibit crosslinking. At 0.3-0.5 wt % of the stabilizer insoluble in the monomer, the grafting yield can be increased, while inhibiting the LDPE-g-IA crosslinking, irrespective of the peroxide used. Hence, classical stabilizers can initiate grafting reactions at raised concentrations, temperatures, and application of the shearing stresses. They also help to obtain a high-grafting yield and a reduced crosslinking degree. A stabilizer, having a close affinity toward LDPE, influences the LDPE-g-IA structure. The stabilizer content of 0.5 wt % transforms the topological structure of LDPE-g-IA into uniblock. Its molecular weight distribution (MWD) may be narrow (~1M_n/~-M_w<2) or broad (~1M_n/~-M_w>2), depending on the concentration of the initiator used.
机译：设置在Brabender塑机上的静态和动态混合器用于研究衣康酸（LA）通过反应挤出接枝到低密度聚乙烯（LDPE）上的方法。自由基反应的引发剂是一过氧化物2,5-二甲基-2-羟基-5-叔丁基过氧-3-己炔和二过氧化物2,5-二甲基-2,5-二甲基-2,5-二（叔-丁基过氧）-己烷。该反应混合物包含如下酚类类型的稳定剂：2，6-二叔丁基-4-甲基苯酚;和。 3，5-二叔丁基-4-羟苯基-丙酸与季戊四醇的酯; 4-烷氧基-2-羟基-二苯甲酮;和1，4-二羟基苯。遵循自由基机理的稳定剂对LA的接枝和交联的影响取决于它们在聚合物和单体中的溶解度。对单体具有增加的亲和力的稳定剂（例如1，4-二羟基苯）降低了接枝产率并抑制了交联。在不溶于单体的稳定剂为0.3-0.5重量％的情况下，不管使用何种过氧化物，都可以提高接枝收率，同时抑制LDPE-g-IA交联。因此，经典的稳定剂可以在升高的浓度，温度和施加剪切应力的情况下引发接枝反应。它们还有助于获得高接枝产率和降低的交联度。对LDPE具有密切亲和力的稳定剂会影响LDPE-g-IA结构。 0.5重量％的稳定剂含量将LDPE-g-IA的拓扑结构转变为单嵌段。根据使用的引发剂的浓度，其分子量分布（MWD）可能较窄（〜1M_n /〜-M_w <2）或较宽（〜1M_n /〜-M_w> 2）。

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