UNUSUAL CRYSTALLIZATION AND MELTING PROCESSES OF AN OPTICALLY ACTIVE POLYOLEFIN:

Annamaria Buono; Jrjeng Ruan; Annette Thierry; Peter Neuenschwander; Bernard Lotz

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UNUSUAL CRYSTALLIZATION AND MELTING PROCESSES OF AN OPTICALLY ACTIVE POLYOLEFIN:

Papers | Updated：2021-06-21

- UNUSUAL CRYSTALLIZATION AND MELTING PROCESSES OF AN OPTICALLY ACTIVE POLYOLEFIN:
- Vol. 23, Issue 2, Pages: 165-170(2005)
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- Published：20 March 2005
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Annamaria Buono, Jrjeng Ruan, Annette Thierry, et al. UNUSUAL CRYSTALLIZATION AND MELTING PROCESSES OF AN OPTICALLY ACTIVE POLYOLEFIN:[J]. 2005, 23(2): 165-170.
DOI：

Annamaria Buono, Jrjeng Ruan, Annette Thierry, et al. UNUSUAL CRYSTALLIZATION AND MELTING PROCESSES OF AN OPTICALLY ACTIVE POLYOLEFIN:[J]. 2005, 23(2): 165-170. DOI：

摘要

Polyolefins that bear a chiral side chain (typically an isobutyl group) experience a so-called macromolecular amplification of chirality: the chiral side-chain induces a slight preference for either tg or tg- main chain conformation. This slight conformational bias is amplified cooperatively along the chain

and results in preferred chirality of the main chain helical conformations. As a result

these polymers display a liquid-crystal (LC) phase both in solution and

in the melt as a transient phase on the way to crystallization. The existence of two processes (melt-LC and LC-crystal transitions) results in unconventional behaviors that were first analyzed by Pino and collaborators back in 1975. These polymers also offer a means to test the structural consequences of recently introduced crystallization schemes. These schemes postulate the formation of a transient liquid-crystal phase as a general scheme for polymer crystallization.

Abstract

and results in preferred chirality of the main chain helical conformations. As a result

these polymers display a liquid-crystal (LC) phase both in solution and

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