摘要
研究了弹性体对聚甲醛的增韧行为,发现材料的韧性不仅与弹性体的含量有关,而且与共混时的剪切速率有关。当弹性体的含量高到一定程度,分散相的粒间距达到临界值,则发生明显的脆韧转变。 随着材料韧性的增加,其相对结晶度下降,在其结晶度下降最大处,材料由脆性到韧性有突变。
Polyoxymethlene-Polyurethane blends are studied. It is found that toughness of the blends relates not only with the content of the elastomer but also the extrusion conditions. The sharp brittle-tough transition is observed at a critical interparticle distance when the content of elastomer is relatively high. In addition, the relative crystallinity of the blends is found to decrease with increasing toughness of systems.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1990年第5期28-31,共4页
Polymer Materials Science & Engineering
关键词
聚甲醛
共混
增韧
冲击韧性
polymer blends, impact toughness, particle size, rubber toughened polyoxy-methlene.
