Abstract
This paper describes the first example of consecutive chain transfer reaction, first to p-methylstyrene (or styrene) and then to hydrogen, during metallocene-catalyzed propylene polymerization by rac-Me2Si[2-Me-4-Ph(Ind)]2ZrCl2/MAO complex. The PP molecular weight is inversely proportional to the molar ratio of [p-methylstyrene]/[propylene] and [styrene]/[propylene] with the chain transfer constants of ktr/kp = 1/6.36 and 1/7.5, respectively. Although hydrogen does not influence the polymer molecular weight, it greatly affects the catalyst activity. Each PP chain formed contains a terminal p-methylstyrene (or styrene) unit. The terminal p-MS unit can be metalated to form a stable polymeric anion for living anionic polymerization to prepare new PP diblock copolymers, such as PP-b-PS, which are very difficult to prepare by other methods. The overall process resembles a transformation reaction from metallocene to living anionic polymerization.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 4871-4876 |
| Number of pages | 6 |
| Journal | Journal of the American Chemical Society |
| Volume | 123 |
| Issue number | 21 |
| DOIs | |
| State | Published - Oct 9 2001 |
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All Science Journal Classification (ASJC) codes
- Catalysis
- Chemistry(all)
- Biochemistry
- Colloid and Surface Chemistry
Cite this
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A novel consecutive chain transfer reaction to p-methylstyrene and hydrogen during metallocene-mediated olefin polymerization. / Chung, Tze-chiang; Dong, J. Y.
In: Journal of the American Chemical Society, Vol. 123, No. 21, 09.10.2001, p. 4871-4876.Research output: Contribution to journal › Article
TY - JOUR
T1 - A novel consecutive chain transfer reaction to p-methylstyrene and hydrogen during metallocene-mediated olefin polymerization
AU - Chung, Tze-chiang
AU - Dong, J. Y.
PY - 2001/10/9
Y1 - 2001/10/9
N2 - This paper describes the first example of consecutive chain transfer reaction, first to p-methylstyrene (or styrene) and then to hydrogen, during metallocene-catalyzed propylene polymerization by rac-Me2Si[2-Me-4-Ph(Ind)]2ZrCl2/MAO complex. The PP molecular weight is inversely proportional to the molar ratio of [p-methylstyrene]/[propylene] and [styrene]/[propylene] with the chain transfer constants of ktr/kp = 1/6.36 and 1/7.5, respectively. Although hydrogen does not influence the polymer molecular weight, it greatly affects the catalyst activity. Each PP chain formed contains a terminal p-methylstyrene (or styrene) unit. The terminal p-MS unit can be metalated to form a stable polymeric anion for living anionic polymerization to prepare new PP diblock copolymers, such as PP-b-PS, which are very difficult to prepare by other methods. The overall process resembles a transformation reaction from metallocene to living anionic polymerization.
AB - This paper describes the first example of consecutive chain transfer reaction, first to p-methylstyrene (or styrene) and then to hydrogen, during metallocene-catalyzed propylene polymerization by rac-Me2Si[2-Me-4-Ph(Ind)]2ZrCl2/MAO complex. The PP molecular weight is inversely proportional to the molar ratio of [p-methylstyrene]/[propylene] and [styrene]/[propylene] with the chain transfer constants of ktr/kp = 1/6.36 and 1/7.5, respectively. Although hydrogen does not influence the polymer molecular weight, it greatly affects the catalyst activity. Each PP chain formed contains a terminal p-methylstyrene (or styrene) unit. The terminal p-MS unit can be metalated to form a stable polymeric anion for living anionic polymerization to prepare new PP diblock copolymers, such as PP-b-PS, which are very difficult to prepare by other methods. The overall process resembles a transformation reaction from metallocene to living anionic polymerization.
UR - http://www.scopus.com/inward/record.url?scp=0034808288&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034808288&partnerID=8YFLogxK
U2 - 10.1021/ja0039280
DO - 10.1021/ja0039280
M3 - Article
C2 - 11457313
AN - SCOPUS:0034808288
VL - 123
SP - 4871
EP - 4876
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 21
ER -