Small range 文档类型:"1"

Totally found 5 items.

  • [会议] PP/PVAc-OMMT复合材料的阻燃性能
    基于聚醋酸乙烯酯(PVAc)-有机蒙脱土(OMMT),通过原位插层聚合技术制备了一种新型的聚合物-粘土纳米复合材料,该复合材料首先在分散有OMMT的醋酸乙烯酯(VAc)中进行乳液聚合,再与聚丙烯(PP)熔融共混制备出PP/PVAc-OMM复合材料.具体研究了PP,PP/OMMT和PP/PVAc-OMMT复合材料的阻燃性能.根据极限氧指数(LOI)数据和锥形量热测试,PVAc-OMMT的加入可提高LOI值,并可降低材料燃烧的热释放程度、有效燃烧热和烟释放过程,阻燃性能提高.
    关键词: 聚丙烯;熔融共混;聚醋酸乙烯酯;有机蒙脱土;阻燃性能
  • [会议] DOC-Stabilized PVAc/MWCNTs Composites for Higher Thermoelectric Performance
    Novel technologies of energy generation are being developed nowadays to keep pace with the increasing energy crisis. Thermoelectric materials have the capability of harvesting waste heat and efficiently converting into useful electrical current. In this work, a commercial polymer is developed to be adopted for thermal electrical energy conversion. Low thermal conductivity Polyvinyl Acetate is used to host multi-walled carbon nanotubes (MWNTs) with different weight percentages (10-70) wt% with the addition of semiconducting Sodium Deoxycholate (DOC) as a nanofiller stabilizer. DOC was found to have a dual role in improving the dispersion of the nanotubes and stabilizing the composite, and hence resulting in higher thermoelectric performance. The composite with 70 wt% MWNTs showed the highest electrical conductivity of 171.7 S/m at 100℃ while the 50 wt% composite recorded the greatest power factor of 0.008 μW/mK~2 at the same temperature.
    关键词: Thermoelectric materials;Organic polymers;Carbon nanotubes;Power factor;Semiconducting stabilizer DOC
  • [会议] 和频振动光谱研究PMMA及PVAc在空气/水界面的聚集行为
    聚合物在空气/水界面的有序单分子层,即聚合物Langmuir膜,由于其独特的结构和界面行为一直备受关注。聚合物结构上微小的变化,可以显著改变其界面行为。故准确了解聚合物在空气/水界面的结构对认识其在界面的吸附机理,粘弹性行为等有着重要的意义。
    关键词: 聚合物单分子层;和频振动光谱;空气/水界面;表面张力
  • [会议] DOC-Stabilized PVAc/MWCNTs Composites for Higher Thermoelectric Performance
    Novel technologies of energy generation are being developed nowadays to keep pace with the increasing energy crisis. Thermoelectric materials have the capability of harvesting waste heat and efficiently converting into useful electrical current. In this work, a commercial polymer is developed to be adopted for thermal electrical energy conversion. Low thermal conductivity Polyvinyl Acetate is used to host multi-walled carbon nanotubes (MWNTs) with different weight percentages (10-70) wt% with the addition of semiconducting Sodium Deoxycholate (DOC) as a nanofiller stabilizer. DOC was found to have a dual role in improving the dispersion of the nanotubes and stabilizing the composite, and hence resulting in higher thermoelectric performance. The composite with 70 wt% MWNTs showed the highest electrical conductivity of 171.7 S/m at 100℃ while the 50 wt% composite recorded the greatest power factor of 0.008 μW/mK~2 at the same temperature.
    关键词: Thermoelectric materials;Organic polymers;Carbon nanotubes;Power factor;Semiconducting stabilizer DOC
  • [会议] 地沟油改性聚醋酸乙烯酯乳液的制备及性能研究
    本文以醋酸乙烯酯为主要单体,以含有功能性基团的地沟油和甘油反应所得地沟油醇解物作为PVAc的改性剂,采用半连续种子乳液聚合法合成了一种性能优异的改性PVAc乳液胶黏剂,并探讨了地沟油醇解物用量对改性PVAc乳液性能的影响.研究结果表明,共聚反应的优选条件为w(引发剂)=0.5%(相对于单体而言),w(乳化剂)=0.4%(相对于单体而言),此条件下合成的改性乳液胶粘剂的耐水性、抗冻性均有所提高,具有较高的粘接能力.红外结果表明,地沟油醇解物与醋酸乙烯酯发生了共聚反应.另外通过调节地沟油醇解物的用量,可以改变改性PVAc乳液的粘度、拉伸强度及成膜后胶膜模量.
    关键词: 乳液胶黏剂;聚醋酸乙烯酯;地沟油改性;粘接能力
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