DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lee, Hwan Kwang | ko |
dc.contributor.author | Kim, Sung Chul | ko |
dc.date.accessioned | 2013-03-03T09:12:45Z | - |
dc.date.available | 2013-03-03T09:12:45Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 1998-01 | - |
dc.identifier.citation | JOURNAL OF APPLIED POLYMER SCIENCE, v.67, no.1, pp.159 - 163 | - |
dc.identifier.issn | 0021-8995 | - |
dc.identifier.uri | http://hdl.handle.net/10203/78143 | - |
dc.description.abstract | The effects of the stereospecificity of a polymer chain and of the interaction in polypropylene (PP) solutions on the relation between liquid-liquid phase separation and crystallization were investigated by using an isotactic PP (i-PP) and a syndiotactic PP (s-PP) of high stereoregularity and of similar molar mass. Dialkyl phthalate was used as a solvent. A series of dialkyl phthalates with a different number of carbon atoms in the alkyl chain was employed to control the interaction between polymer and solvent. Phase transition temperatures were measured by optical microscopy with a hot stage. Liquid-liquid phase separation temperature (TL-L) in the system of i-PP and dihexyl phthalate was located below its melting temperature (T-m). However, TL-L for the s-PP system in the same solvent was elevated much above its T-m due to a decreased T-m and increased TL-L. The reduced solubility of s-PP is primarily attributed to enhanced hydrophobicity arising from alternate positioning of the methyl groups along the polymer chain. As the length of the alkyl chain in the phthalate increases, TL-L decreases significantly and T-m decreases slightly, resulting in the value of TL-L shifting below that of T-m for the solution of s-PP and dinonyl phthalate. (C) 1998 John Wiley & Sons, Inc. | - |
dc.language | English | - |
dc.publisher | Wiley-Blackwell | - |
dc.title | Relation between liquid-liquid phase separation and crystallization in isotactic and syndiotactic polypropylene solutions | - |
dc.type | Article | - |
dc.identifier.wosid | A1998YH75600018 | - |
dc.identifier.scopusid | 2-s2.0-0032477483 | - |
dc.type.rims | ART | - |
dc.citation.volume | 67 | - |
dc.citation.issue | 1 | - |
dc.citation.beginningpage | 159 | - |
dc.citation.endingpage | 163 | - |
dc.citation.publicationname | JOURNAL OF APPLIED POLYMER SCIENCE | - |
dc.identifier.doi | 10.1002/(SICI)1097-4628(19980103)67:1<159::AID-APP18>3.0.CO;2-X | - |
dc.contributor.localauthor | Kim, Sung Chul | - |
dc.contributor.nonIdAuthor | Lee, Hwan Kwang | - |
dc.type.journalArticle | Article | - |
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