Determination of molecular weight and its distribution of rigid-rod polymers determined by phase-modulated flow birefringence technique
✍ Scribed by Yum Rak Oh; Young Sil Lee; Moo Hyun Kwon; O Ok Park
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 150 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0887-6266
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✦ Synopsis
The phase-modulated flow birefringence (PMFB) method is widely accepted as one of the most sensitive and accurate techniques suitable for experimental tests on the molecular theory of polymer solutions. The objective of this study is to develop a systematic method to determine molecular weight and distribution of rigid-rod polymers by the PMFB technique. Using molecular theory for rigid polymers, birefringence ⌬n and orientation angle have been expressed as a function of molecular weight and distribution. ⌬n has been shown to be proportional to ⌺c i M i 4 , and cot 2 turned out to have a linear relationship with ⌺c i M i 7 /⌺c i M i 4 . From the experimental results for PBLG solutions, birefringence and orientation angle data were in some degree matched with the theory presented.