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Preparation Oraganozinc Compounds Bearing Styrene Moiety for One-pot Synthesis of Polystyrene-Polyolefin- Polystyrene Multi-Block Copolymers
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | 이분열 | - |
| dc.contributor.author | 김청솔 | - |
| dc.date.accessioned | 2018-11-08T08:12:04Z | - |
| dc.date.available | 2018-11-08T08:12:04Z | - |
| dc.date.issued | 2018-02 | - |
| dc.identifier.other | 27119 | - |
| dc.identifier.uri | https://dspace.ajou.ac.kr/handle/2018.oak/11596 | - |
| dc.description | 학위논문(석사)--아주대학교 일반대학원 :분자과학기술학과,2018. 2 | - |
| dc.description.tableofcontents | 1.Introduction 2. Experimental section 2.1 Preparation of (CH2=CHC6H4CH2CH2)2Zn 2.2 Typical Procedure for the Synthesis of Block Copolymers 2.3 High-Temperature GPC Studies 2.4 Sample Preparation for Transmission Electron Microscopy (TEM) 2.5 Tensile Tests 3. Results and Discussion 3.1 Strategy for the Preparation of PS-Block-PO-Block-PS 3.2 Synthesis of PS-Block-PO-Block-PS 3.3 Characterization of the Block Copolymers 4. Conclusion 5. Reference 6. Supporting Information | - |
| dc.language.iso | kor | - |
| dc.publisher | The Graduate School, Ajou University | - |
| dc.rights | 아주대학교 논문은 저작권에 의해 보호받습니다. | - |
| dc.title | Preparation Oraganozinc Compounds Bearing Styrene Moiety for One-pot Synthesis of Polystyrene-Polyolefin- Polystyrene Multi-Block Copolymers | - |
| dc.title.alternative | Preparation Oraganozinc Compounds Bearing Styrene Moiety for One-pot Synthesis of Polystyrene-Polyolefin- Polystyrene Multi-Block Copolymers | - |
| dc.type | Thesis | - |
| dc.contributor.affiliation | 아주대학교 일반대학원 | - |
| dc.contributor.alternativeName | Kim Chungsol | - |
| dc.contributor.department | 일반대학원 분자과학기술학과 | - |
| dc.date.awarded | 2018. 2 | - |
| dc.description.degree | Master | - |
| dc.identifier.localId | 800475 | - |
| dc.identifier.url | http://dcoll.ajou.ac.kr:9080/dcollection/jsp/common/DcLoOrgPer.jsp?sItemId=000000027119 | - |
| dc.subject.keyword | Blockcopolymer | - |
| dc.subject.keyword | Polyolefin | - |
| dc.subject.keyword | Thermoplastic elastomer | - |
| dc.description.alternativeAbstract | Triblock copolymers of polystyrene (PS) and a polyolefin (PO), e.g., PS-block-poly(ethylene-co-1-butene)-block-PS (SEBS), are attractive materials for use as thermoplastic elastomers and are produced commercially by a two-step process that involves the costly hydrogenation of PS-block-polybutadiene-block-PS. We herein report a one-pot strategy for attaching PS chains to both ends of PO chains to construct PS-block-PO-block-PS directly from olefin and styrene monomers. Dialkylzinc compound containing styrene moieties ((CH2=CHC6H4CH2CH2)2Zn) was prepared, from which poly(ethylene-co-propylene) chains were grown via “coordinative chain transfer polymerization” using the pyridylaminohafnium catalyst to afford di-end functional PO chains functionalized with styrene and Zn moieties. Subsequently, PS chains were attached at both ends of the PO chains by introduction of styrene monomers in addition to the anionic initiator Me3SiCH2Li·(pmdeta) (pmdeta = pentamethyldiethylenetriamine). We found that the fraction of the extracted PS homopolymer was low (~20 %) and that molecular weights were evidently increased after the styrene polymerization (ΔMn = 27–54 kDa). Transmission electron microscopy showed spherical and wormlike PS domains measuring several tens of nm segregated within the PO matrix. Optimal tensile properties were observed for the sample containing a propylene mole fraction of 0.25 and a styrene content of 33 %. Finally, in the cyclic tensile test, the prepared copolymers exhibited thermoplastic elastomeric properties with no breakage up over 10 cycles, which is comparable to the behavior of commercial-grade SEBS | - |
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- Graduate School of Ajou University > Department of Molecular Science and Technology > 3. Theses(Master)
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