Molecular chain heterogeneity of a branched polyethylene resin using cross-fractionation techniques
文献类型：期刊论文
| 作者 | Xue, Yanhu; Bo, Shuqin; Ji, Xiangling |
| 刊名 | JOURNAL OF POLYMER RESEARCH
 |
| 出版日期 | 2015-07-26 |
| 卷号 | 22期号:8 |
| 关键词 | Branched polyethylene Microstructure Heterogeneity TREF Cross-fractionation |
| 英文摘要 | The typical standard long chain branching (LCB) polyethylene (PE) SRM1476 is issued by the American National Bureau of Standards, which is widely used as a standard reference material in chromatographic experiments. Although some works have been reported in literatures, they are not consistent, such as the data about its molecular weight and molecular weight distribution. Therefore, it is necessary to further investigate the microstructure features of 5RM1476 in order to better serve as a reference object in comparison with other unknown resins, in this study, the molecular chain heterogeneity of SRM1476 is investigated extensively and compared with the linear PE SRM1475. Based on the characterization of the original sample, SRM1476 actually has both LCB and short chain branching (SCB) structures, as well as the SCB content is more than LCB content in C-13-NMR results. After successive self-nucleation and annealing (SSA) thermal fractionation. SRM1476 shows a broad-range endo-thenn with multiple melting peaks (more than eight peaks), which proves the molecular chain heterogeneity in SRM1476. SRM1476 is fractionated into nine fractions by preparative temperature rising elution fractionation (TREF). At the high elution temperature region, the amounts of fractions are more than 90 %. and their molecular weights are higher. At the low elution temperature region below 50 'V molecular weights of fractions are lower and their amounts are less than 5 %. Differential scanning calorimetry (DSC) melting curves of TREF fractions with higher elution temperatures shift toward higher temperature with sharper melting peaks. in the results of TREF-SSA cross-fractionation, each fraction shows a broad-range endotheim with multiple melting peaks that shift toward the high elution temperature region with the elution temperature. The arithmetic mean methylene sequence lengths of TREF fractions gradually increase from 33 to 105 as elution temperature increases. Results from TREF-DSC and TREFSSA cross-fractionations indicate that SRM1476 and its TREF fractions have both intramolecular and intermolecular heterogeneity. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2015-10-27 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/27885]  |
| 专题 | 化学研究所_高分子物理与化学实验室 |
| 作者单位 | Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xue, Yanhu,Bo, Shuqin,Ji, Xiangling. Molecular chain heterogeneity of a branched polyethylene resin using cross-fractionation techniques[J]. JOURNAL OF POLYMER RESEARCH,2015,22(8). |
| APA | Xue, Yanhu,Bo, Shuqin,&Ji, Xiangling.(2015).Molecular chain heterogeneity of a branched polyethylene resin using cross-fractionation techniques.JOURNAL OF POLYMER RESEARCH,22(8). |
| MLA | Xue, Yanhu,et al."Molecular chain heterogeneity of a branched polyethylene resin using cross-fractionation techniques".JOURNAL OF POLYMER RESEARCH 22.8(2015). |
入库方式： OAI收割
来源：化学研究所
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