摘要
合成了聚氨酯（ＰＵ）和聚乙烯基酯（ＰＶＥ）为基的全水发泡聚合物互穿网络（ＩＰＮｓ）软质泡沫。各配方泡沫的聚氨酯对聚乙烯基路的比例和／或水量各不相同，在同等水量和相同密度的两组泡沫中，ＰＵ／ＰＶＥ＝９０／１０的泡沫均呈现拉伸强大最高值。随乙烯基酯含量的增加，所有泡沫的落球回弹降低，同时压缩滞后增加。这种能量吸收能力的提高也反映在动态力学谱上，即聚氨酯软段和聚乙烯基酯的玻璃化温度间的高阻尼区明显变宽。聚氨酯软段Ｔｇ的显著移高表明，聚氨酯软段和聚乙烯基酯链段发生了相当程度的相互穿。
Two component interpenetrating polymer network (IPN) water blown flexible foams based on polyurethane (PU) and polyvinylester (PVE) were prepared by simultaneous technique. The PU/PVE ratio and water content were varied. The IPN foam exhibits a maximum in tensile strength at 10% by weight of vinylester either in the group of equal density (18 kg/m3) foams and in the group of foams with same water level (2 pbw ). The resiliens of all the IPN foams decreased with increasing vinylester content while the hysteresis increaed. Enhanced energy absorbing abilities were also demonstrated by dynamic mechnical spectroscopy. This was reflected in broadened high dampins ranges between the glass transition temporatures of PU and PVE. The significant increase in soft segment Tg indicates a good deal of phase interpenitration between the PU soft segment and PVE.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1994年第4期41-46,共6页
Polymer Materials Science & Engineering
