کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10564481 | 970762 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Transition temperatures and molecular structures of poly(methyl methacrylate) thin films by principal component analysis: comparison of isotactic and syndiotactic poly(methyl methacrylate)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Transition temperatures and molecular structures of poly(methyl methacrylate) thin films by principal component analysis: comparison of isotactic and syndiotactic poly(methyl methacrylate) Transition temperatures and molecular structures of poly(methyl methacrylate) thin films by principal component analysis: comparison of isotactic and syndiotactic poly(methyl methacrylate)](/preview/png/10564481.png)
چکیده انگلیسی
This study determines the glass transition temperatures of isotactic and syndiotactic poly(methyl methacrylate) (PMMA) thin films and provides plausible molecular origins by principal component analysis (PCA). Principal components (PCs) are calculated for reflection-absorption FTIR spectra of isotactic and syndiotactic PMMA thin films in two spectral regions, 1000-1800 and 1100-1300 cmâ1. The glass transition temperature is assigned to the highest peak (or the lowest valley) in the PC score plot. The glass transition temperatures of isotactic and syndiotactic PMMA thin films thus determined are 60 and 110-120 °C, respectively, which are consistent with existing results obtained by other techniques. The PC loadings indicate that the carbonyl groups giving rise to bands in the range of 1700-1750 cmâ1 affect the thermal properties and the flattened structure in the isotactic PMMA thin film but not in the syndiotactic PMMA thin film.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vibrational Spectroscopy - Volume 37, Issue 1, 14 January 2005, Pages 69-76
Journal: Vibrational Spectroscopy - Volume 37, Issue 1, 14 January 2005, Pages 69-76
نویسندگان
Hyeon Suk Shin, Hyeseon Lee, Chi-Hyuck Jun, Young Mee Jung, Seung Bin Kim,