# CONCENTRATION DEPENDENCE OF CRYSTALLINE POLY(L-LACTIDE) PREPARED BY FREEZE-DRYING SOLUTIONS

> Title: CONCENTRATION DEPENDENCE OF CRYSTALLINE POLY(L-LACTIDE) PREPARED BY FREEZE-DRYING SOLUTIONS Page Range: p.31-35 Author(s): Hao Hong; Liu Rongjie; Zhao Yaling File size: 155K Download the pdf (subscribers only) Buy the pdf (non-subscribers) Journal: Polymers and Polymer Composites Issue Year: ppc Volume: 17...

Canonical URL: https://polymerjournals.com/concentration-dependence-of-crystalline-polyl-lactide-prepared-by-freeze-drying-solutions/
Published: 2009-01-01T00:00:00+00:00
Categories: Polymers and Polymer Composites

**Title: CONCENTRATION DEPENDENCE OF CRYSTALLINE POLY(L-LACTIDE) PREPARED BY FREEZE-DRYING SOLUTIONS**
 Page Range: p.31-35
 Author(s): Hao Hong; Liu Rongjie; Zhao Yaling
 File size: 155K
 ![](http://dload.gif) [Download the pdf](http://journals.asp?Page=111&JournalDownload=ON&JournalType=ppc&JournalIssue=ppc17-1&JournalID=100726&JIP=) (subscribers only)
 ![](http://handbuy.gif) Buy the pdf (non-subscribers)
 Journal: Polymers and Polymer Composites
 Issue Year: ppc
 Volume: 17
 Issue No: No.1

**Abstract**
 Poly(L-lactide) was freeze dried from p-xylene solutions of varying concentrations and the molecular conformation and thermal properties of the freeze-dried poly(L-lactide) investigated by DSC and X-ray diffraction. It was found that the molecular conformation of the polymer in solution changed with solvent and temperature and that samples produced from dilute solution exhibited higher non-isothermal crystallisation temperatures and faster crystallisation rates. A critical concentration corresponding to De Gennes critical overlap concentration was detected and polymer chains were isolated from each other in solutions below the critical concentration, resulting in accelerated melt crystallisation of recovered samples. 14 refs.

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