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| Thesis Name： |
Chain transfer reaction studies by metallocene mediated |
| Usage： |
chemical industry |
| Keyword： |
Chain transfer reaction，metallocene，syndiotatic polymerization ，of propylene |
| Remarks： |
[Abstract]
In this work, we demonstrate that by combined case of p-methyl styrene (pMS) and hydrogen as chain transfer agents resulted in pMS terminated syndiotactic propylene (sPP-t-pMS) in the presence of Ph2C(Cp)(Flu)ZrCl2 /MAO catalyst. It has been shown that the molecular weight of the sPP-t-pMS can be accurately
controlled by carefully regulating the hydrogen and propylene pressures as well as regulating the amount of pMS in feed. Detail polymerization condition studies reveal that the molecular weight of sPP-t-pMS is mainly depending on the concentration of pMS.Subsequently, the resulting telechelic polymers, sPP-t-pMS, can be treated with strong Lewis base (e.g. sec-butyl lithium) followed by adding excess of dimethylsilyldichloride to give end-silylated sPP with active chloro end group for coupling with an anionically polymerized block. We successfully applied the above synthetic route for preparing two novel diblock copolymers, mainly,
syndiotactic polypropylene-block-poly-2-vinylpyridine and syndiotactic
polypropylene-block-poly-methyl methacrylate . |
| Original file： |
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Promulgator Detail |
| Full name: |
administrator |
| Country: |
CN |
| City: |
Dalian |
| Company Name: |
teloon Soft Strategy Co.,LTD |
| Homepage: |
http://www.hichem.com |
| E-mail: |
reply |
| Phone: |
86-411-82811662 |
| Fax: |
86-411-82819667 |
| Company Address: |
26 Renmin Road ,Dalian China |
| Zip/Postal Code: |
116001 |
| Introduction: |
As a professional E-information service platform with authoritative news and reports in chemical industry of chinese export and import market.Hichem has been received universally and praised highly since its established in 2001.In 2003,by joint effort of teloon chemicals and teloon soft strategy company(TSSC),Hichem team endeavored to recomposition the site ascribed to market requirement as well as offering our better service.Hichem focused on business to biusiness of new chemicals,fine chemicals,high chemicals and special chemicals.So naturally it is the very one-stop website for chemical information.Our sellers worldwide and build global on-line trade in the chemical industry. |
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