Measuring Order in Regioregular Poly(3-hexylthiophene) with Solid-State 13C CPMAS NMR

详细信息    查看全文

• 作者：Ryan C. Nieuwendaal ; Chad R. Snyder ; Dean M. DeLongchamp
• 刊名：ACS Macro Letters
• 出版年：2014
• 出版时间：February 18, 2014
• 年：2014
• 卷：3
• 期：2
• 页码：130-135
• 全文大小：360K
• ISSN：2161-1653

文摘

We report on measurements of order in semicrystalline, high molar mass poly(3-hexylthiophene) (P3HT) by solid-state ¹³C cross-polarization magic angle spinning (CPMAS) nuclear magnetic resonance (NMR) measurements. The relative degree of crystallinity was estimated for two films with different drying conditions via X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Order determined by ¹³C NMR does not necessarily correlate with crystallinity, indicating that local order can occur in noncrystalline regions. Slow main chain dynamics influence the ¹³C NMR peak widths at lower temperatures (<0 掳C), with side chain motions influencing the main chain motions. At higher temperatures (>0 掳C), where narrower thiophene resonances are observed, these main chain conformation rearrangements occur on fast time scales (3 ms). This room-temperature dynamic disorder suggests that P3HT may be classified as a conformationally disordered (CONDIS) crystal.