Anionic styrene polymerization in the presence of dialkylzinc for Polyolefin-Polystyrene block copolymers
- 주제(키워드) blockcopolymer
- 발행기관 아주대학교
- 지도교수 이분열
- 발행년도 2016
- 학위수여년월 2016. 8
- 학위명 석사
- 학과 및 전공 일반대학원 분자과학기술학과
- 실제URI http://www.dcollection.net/handler/ajou/000000022807
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
The two representative bulk polymers, polyolefin (PO) and polystyrene (PS) were molecularly connected to form PO-block-PS by sequential performance of the coordination and the anionic polymerizations in one pot. Ethylene/1-octene copolymerization was performed using a typical ansa-metallocene catalyst rac-[Me2Si(2-methylindenyl)]2ZrCl2 activated MMAO in the presence of di(alkyll)zinc to grow PO-chains attaching to zinc site. The anionic polymerization was subsequently performed by feeding nBuLi•(tmeda) (tmeda, N,N,N',N'-tetramethylethylenediamine) initiator and styrene monomer to grow PS-chains at the zinc site consequently attaching to PO-chains. Addition of tmeda played a key role in the growth of the PS-chains at the zinc site. Preparation of other type of PO-based block copolymers is an hot issue in the field of the controlled polymerization. So we found new zinc compound for Polyolefin-Polystyrene copolymers which has 4-(isopropenyl)benzyl. And researching on reactivity of a-methylstyrene.
more목차
Abstract…………………………………………………………...……………… I
1. Introduction ....................................................................................................... 1
2. Results and Discussion ...................................................................................... 3
2.1 Anionic styrene polymerization in the presence of dialkylzinc.............. 3
2.2 Reactivity of -methylstyrene. ……......................................................... 6
3. Conclusions ....................................................................................................... 12
4. Experimental Section ....................................................................................... 13
4.1 General remarks…………………………………................................... 13
4.2 Typical anionic styrene polymerization in the presence of (hexyl)2Zn.13
4.3 Polymerization. ………………………………………………………… 14
4.4 Synthesis of [4-(isopropenyl)benzyl]2Zn ……………………………... 14
4.5 Reaction of (sheme3. (a)) ……………………………………………… 15
4.6 General method of NMR Study ………………………………………. 16
5. Acknowledgements.......................................................................................... 17
6. Reference ......................................................................................................... 18
7. Supporting information .................................................................................. 21
