Positron lifetime as a nanoprobe for free volume distribution in high density polyethylene carbon black conducting composites
文献类型：期刊论文
| 作者 | Patnaik, A; Zhu, Z; Yang, G; Sun, Y |
| 刊名 | PHYSICA STATUS SOLIDI A-APPLIED RESEARCH
 |
| 出版日期 | 1998-09-16 |
| 卷号 | 169页码:115-125 |
| ISSN号 | 0031-8965 |
| 英文摘要 | The room-temperature electrical conductivity of High Density Polyethylene-Carbon Black (HDPE-CB) switching composites as a function of the conductive filler (CB) content was studied by Positron Annihilation Lifetime Spectroscopy (PALS). The CB, highly structured and porous, imparted high conductivity to its composite, starting at a low level of loading. Deconvolution of the lifetime spectra into 4 components reflected upon 3 different morphologies of the composite structure. The free volume was probed using o-Ps pick-off annihilation lifetime parameter tau(4) as a measure of electron density and the mean free volume cavity radius. The probability of o-Ps formation and the concentration of free volume cavities were probed by the o-Ps pick-off intensity I-4. In the blended composite of 29 phr (parts per hundred parts of resin), the mean free volume size increased to 3.56 Angstrom from 3.27 Angstrom, in the pristine polymer with the corresponding increase in the free volume to 204.5 Angstrom(3) from 146.8 Angstrom(3). The relative number of free volume cavities (I-4) in the composite remained fewer than the host polymer over the CB concentration studied. The changes in the cavity size and concentration, particularly a decrease in the relative intensity I-4 by 10.5% resulted in the introduction of enhanced crystallinity into the composite structure which was evidenced from a variation in crystallinity from approximate to 75% in the pristine to approximate to 85% in the 29 phr CB-HDPE composite in the X-ray diffraction profiles. |
| WOS关键词 | ANNIHILATION LIFETIME ; PRESSURE-DEPENDENCE ; SURFACE OXIDATION ; EPOXY POLYMER ; SPECTROSCOPY ; POLYCARBONATE ; SIZE |
| WOS研究方向 | Materials Science ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000076351300019 |
| 出版者 | WILEY-V C H VERLAG GMBH |
| 源URL | [http://119.78.100.186/handle/113462/35395]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Patnaik, A |
| 作者单位 | 1.Indian Inst Technol, Dept Chem, Madras 600036, Tamil Nadu, India 2.Chinese Acad Sci, Inst Modern Phys, Lanzhou, Peoples R China |
| 推荐引用方式 GB/T 7714 | Patnaik, A,Zhu, Z,Yang, G,et al. Positron lifetime as a nanoprobe for free volume distribution in high density polyethylene carbon black conducting composites[J]. PHYSICA STATUS SOLIDI A-APPLIED RESEARCH,1998,169:115-125. |
| APA | Patnaik, A,Zhu, Z,Yang, G,&Sun, Y.(1998).Positron lifetime as a nanoprobe for free volume distribution in high density polyethylene carbon black conducting composites.PHYSICA STATUS SOLIDI A-APPLIED RESEARCH,169,115-125. |
| MLA | Patnaik, A,et al."Positron lifetime as a nanoprobe for free volume distribution in high density polyethylene carbon black conducting composites".PHYSICA STATUS SOLIDI A-APPLIED RESEARCH 169(1998):115-125. |
入库方式： OAI收割
来源：近代物理研究所
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