Morphological Characteristics of beta-Nucleating Agents Governing the Formation of the Crystalline Structure of Isotactic Polypropylene
文献类型：期刊论文
| 作者 | BSRF用户 |
| 刊名 | MACROMOLECULES
 |
| 出版日期 | 2021 |
| 卷号 | 54期号:14页码:6824--6834 |
| ISSN号 | 0024-9297 |
| DOI | 10.1021/acs.macromol.1c01038 |
| 文献子类 | Article |
| 英文摘要 | The effect of the morphological characteristics of N,N'-dicyclohexylterephthalamide (DCHT), an aromatic bisamide beta-nucleating agent (beta-NA) showing a dual nucleation capability for the beta- and alpha-crystals of isotactic polypropylene (iPP), on the polymorphic composition of iPP and the underlying mechanism were systematically investigated. DCHT crystals differing in their size and distribution state in the iPP melt and recrystallized morphology were obtained by modulating the final heating temperature (T-f), subsequent cooling rate (V-c), and content of DCHT. The crystalline structures formed on the different surfaces of needle-like DCHT crystals were clearly identified. For the iPP/0.1 wt % DCHT samples, the relative fraction of beta-crystal (K-beta value) in the iPP sample nucleated with small-sized needle-like DCHT crystals is much higher than that in the iPP sample nucleated with large-sized needle-like DCHT crystals. This increase is primarily because there is less space for the crystallization of the iPP melt into alpha-spherulites arising from a more homogeneous distribution of small DCHT crystals in the iPP matrix. Upon cooling at the same V-c, dendritic DCHT crystals tend to induce more beta-crystals than needle-like ones, especially at a high V-c, which is predominantly due to an increase in the relative density of beta-nuclei to a-nuclei (N beta/N alpha). Interestingly, it was found that DCHT crystals crystallize into microcrystalline agglomerates in the subsequent cooling process when completely dissolved in the iPP/0.05 wt % DCHT melt. More interestingly, the K-beta value in the iPP sample reaches as high as similar to 1.0 during isothermal crystallization at 135 degrees C, indicating that DCHT microcrystalline agglomerates unexpectedly exhibit a specific nucleation selectivity for beta-crystal. The present investigation elucidates the significant impact of the morphological characteristics of DCHT on the polymorphic composition of iPP, providing a promising way to tune the microstructure and macroscopic performance of iPP materials. |
| 电子版国际标准刊号 | 1520-5835 |
| WOS研究方向 | Polymer Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000679398200021 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/293596]  |
| 专题 | 北京同步辐射装置 |
| 推荐引用方式 GB/T 7714 | BSRF用户. Morphological Characteristics of beta-Nucleating Agents Governing the Formation of the Crystalline Structure of Isotactic Polypropylene[J]. MACROMOLECULES,2021,54(14):6824--6834. |
| APA | BSRF用户.(2021).Morphological Characteristics of beta-Nucleating Agents Governing the Formation of the Crystalline Structure of Isotactic Polypropylene.MACROMOLECULES,54(14),6824--6834. |
| MLA | BSRF用户."Morphological Characteristics of beta-Nucleating Agents Governing the Formation of the Crystalline Structure of Isotactic Polypropylene".MACROMOLECULES 54.14(2021):6824--6834. |
入库方式： OAI收割
来源：高能物理研究所
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