原位聚合纳米Ni/聚苯乙烯复合材料及其热力学性能
Thermodynamics parameters of nano-Ni/PS composites prepared by in situ polymerization method
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摘要: 磁性聚苯乙烯(PS)材料有利于实现惯性约束聚变靶丸在辐射场中的无接触支撑。采用液相还原法制备了粒度为75~200 nm的Ni球形粒子，用原位聚合的方法制备了纳米Ni/PS复合材料。利用X射线衍射仪、傅氏转换红外线光谱分析仪、扫描电子显微镜及热重差示扫描量热仪分别研究了所得纳米Ni的特性、复合材料的结构及掺杂量对纳米Ni/PS复合材料的热力学行为的影响。研究结果表明：纳米Ni的掺杂能提高玻璃转变温度；纳米Ni的掺杂可以增大PS热分解焓变，在掺杂质量分数为1%~2%之间焓变达到最大；纳米Ni的掺杂降低了纳米Ni/PS复合材料热分解的比热容。Abstract: Spherical nickel nanoparticles with about 75~200 nm in size were obtained by a liquid reduction method. The nickel nanoparticles/PS composites were synthesized via in situ polymerization method. XRD, FTIR, SEM and TG-DSC were respectively used to measure the properties of nickel nanoparticles, the microstructure of as-prepared composites samples, the distribution of nickel nanoparticles in PS and the thermodynamic parameters of as-prepared composites. The results show that the nickel nanoparticles will enhance the glass transition temperature of nano-Ni/PS composites. The enthalpy of composites is heightened by increasing of doping dose, and it reaches the top when the doping dose is from 1% to 2%. The specific heat of the composites will reduce with the doping dose of nickel nanoparticles
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Key words:
- nickel nanoparticles /
- polystyrene /
- in situ polymerization /
- thermodynamics parameters
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