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Polymerization of Allyltrimethylisilane and 4-Methyl-1-Pentene by Using Metallocene Catalysts.
| Content Provider | Europe PMC |
|---|---|
| Author | Wang, Wei Ren, Minqiao Hou, Liping Qu, Shuzhang Li, Xinwei Guo, Zifang |
| Editor | Cutroneo, Mariapompea |
| Copyright Year | 2023 |
| Abstract | Polymers of higher olefin, obtained by Ziegler-type polymerization, have been used in some critical fields, e.g., as the membrane for extracorporeal membrane oxygenation (ECMO), which plays an important role in the treatment of patients with severe COVID-19. The polymer obtained by a single-site catalyst, e.g., metallocene catalysts, demonstrated a higher performance. The homo- and co-polymerization of allyltrimethylisilane (ATMS) and 4-methyl-1-pentene (4M1P) were conducted using syndiospecific (cat 1) and isospecific (cat 2) metallocene catalysts. Cat 1 showed low conversions and provided a polymer with a higher molecular weight, while cat 2 behaved oppositely. 13C-NMR spectra certified the stereotacticity of the resultant polymer, and the resonance of the carbon atom of CH2 (αα’) between the two tertiary carbon atoms of the ATMS and 4M1P units were observed. This could be the evidence of the formation of a true copolymer. The crystallization of the polymer was explored using a differential scanning calorimeter (DSC) and wide angle X-ray diffraction (WAXD). All homopolymers and some of the copolymers showed high melting temperatures and low melting enthalpies. The WAXD patterns of the syndiotactic polymer and isotactic homopolymer or the ATMS-rich copolymer were consistent with the reported literature, but the isotactic 4M1P-rich copolymer provided the crystal form I, which is unusual for a 4M1P polymer without any pretreatment. |
| Journal | Polymers |
| Volume Number | 15 |
| PubMed Central reference number | PMC10180761 |
| Issue Number | 9 |
| PubMed reference number | 37177185 |
| e-ISSN | 20734360 |
| DOI | 10.3390/polym15092038 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2023-04-25 |
| Access Restriction | Open |
| Rights License | Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2023 by the authors. |
| Subject Keyword | metallocene copolymerization allyltrimethylisilane 4-methyl-1-pentene crystallization |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Polymers and Plastics |
