Abstract
Molecular organization in the solid state of a homologous series of chiral and achiral polymers was studied by electron microscopy and electron diffraction. All polymers of the series had periodic molecular backbones and some contained a stereocenter substituted by nitrile groups every 16 or 17 atoms along the chain. An aliphatic unit served as a spacer between aromatic units and was part of the repeats in all polymers. This spacer contained either an even or odd number of carbons in order to generate a preference for extended or nonextended conformers, respectively. Enantiomeric enrichment of chains resulted in the formation of crystals but diastereomeric chains with even spacer formed a phase of intermediate order and those with odd spacer formed an amorphous material. Enantiomerically enriched chains are also board-shaped and organize edge-to-edge, a feature definitely not observed in one of the two unsubstituted (achiral) homologous chains studied here. The global conformational traits of chains determined if extended-chain or folded-chain crystals formed.
| Original language | English |
|---|---|
| Pages (from-to) | 2618-2628 |
| Number of pages | 11 |
| Journal | Macromolecules |
| Volume | 28 |
| Issue number | 8 |
| Publication status | Published - Jan 1 1995 |
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ASJC Scopus subject areas
- Materials Chemistry
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Materials chemistry of chiral macromolecules. 2. Solid-state structures. / Li, Li Sheng; Stupp, Samuel I.
In: Macromolecules, Vol. 28, No. 8, 01.01.1995, p. 2618-2628.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Materials chemistry of chiral macromolecules. 2. Solid-state structures
AU - Li, Li Sheng
AU - Stupp, Samuel I
PY - 1995/1/1
Y1 - 1995/1/1
N2 - Molecular organization in the solid state of a homologous series of chiral and achiral polymers was studied by electron microscopy and electron diffraction. All polymers of the series had periodic molecular backbones and some contained a stereocenter substituted by nitrile groups every 16 or 17 atoms along the chain. An aliphatic unit served as a spacer between aromatic units and was part of the repeats in all polymers. This spacer contained either an even or odd number of carbons in order to generate a preference for extended or nonextended conformers, respectively. Enantiomeric enrichment of chains resulted in the formation of crystals but diastereomeric chains with even spacer formed a phase of intermediate order and those with odd spacer formed an amorphous material. Enantiomerically enriched chains are also board-shaped and organize edge-to-edge, a feature definitely not observed in one of the two unsubstituted (achiral) homologous chains studied here. The global conformational traits of chains determined if extended-chain or folded-chain crystals formed.
AB - Molecular organization in the solid state of a homologous series of chiral and achiral polymers was studied by electron microscopy and electron diffraction. All polymers of the series had periodic molecular backbones and some contained a stereocenter substituted by nitrile groups every 16 or 17 atoms along the chain. An aliphatic unit served as a spacer between aromatic units and was part of the repeats in all polymers. This spacer contained either an even or odd number of carbons in order to generate a preference for extended or nonextended conformers, respectively. Enantiomeric enrichment of chains resulted in the formation of crystals but diastereomeric chains with even spacer formed a phase of intermediate order and those with odd spacer formed an amorphous material. Enantiomerically enriched chains are also board-shaped and organize edge-to-edge, a feature definitely not observed in one of the two unsubstituted (achiral) homologous chains studied here. The global conformational traits of chains determined if extended-chain or folded-chain crystals formed.
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UR - http://www.scopus.com/inward/citedby.url?scp=0029289729&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0029289729
VL - 28
SP - 2618
EP - 2628
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 8
ER -