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Impact of side‐chain length on the phase structures of P3ATs and P3AT:PCBM films as revealed by SSNMR and FTIR.
- Source :
- Journal of Polymer Science Part B: Polymer Physics; May2018, Vol. 56 Issue 9, p751-761, 11p
- Publication Year :
- 2018
-
Abstract
- ABSTRACT: It is known that poly(3‐alkylthiophene) (P3AT) side‐chain length notably influences the photovoltaic performances of relating devices. However, comprehensively study on its impact on the structures of P3ATs and their blends with [6, 6]‐phenyl‐C<subscript>61</subscript> butyric acid methyl ester (PCBM) is insufficient. By using solid‐state NMR and FTIR techniques, four P3ATs and their PCBM blends are investigated in this work, focusing on the phase structures as modulated by side‐chain length. Recently, we revealed multiple crystalline main‐chain packings of packing <italic>a</italic> and <italic>b</italic> together with a mesophase in poly(3‐butylthiophene) (P3BT) films (DOI: 10.1021/acs.macromol.6b01828). Here, the semicrystalline structures are investigated on poly(3‐hexylthiophene) (P3HT), poly(3‐octylthiophene) (P3OT), and poly(3‐dodecylthiophene) (P3DDT) with traditional form I modification, where packing <italic>a</italic> and the amorphous phase are probed. Furthermore, crystallized side chain within packing <italic>a</italic> is detected in both P3OT and P3DDT films, which shows a FTIR absorption at 806 cm<superscript>−1</superscript>. Structural studies are also conducted on P3AT:PCBM blends. Compared with the pure P3ATs, the polymer crystallinities of the blends show reduction of about 40% for P3OT and P3DDT, whereas only about 10% for P3HT. Moreover, in P3BT:PCBM and P3HT:PCBM, the crystalline polymers and PCBM are phase separated, while in P3OT:PCBM and P3DDT:PCBM, blend components are mostly miscible. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. <bold>2018</bold>, <italic>56</italic>, 751–761 [ABSTRACT FROM AUTHOR]
- Subjects :
- POLYALKYLTHIOPHENES
SUBSTITUENTS (Chemistry)
POLYMER films
BUTYRATES
METHYL formate
Subjects
Details
- Language :
- English
- ISSN :
- 08876266
- Volume :
- 56
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Journal of Polymer Science Part B: Polymer Physics
- Publication Type :
- Academic Journal
- Accession number :
- 128679999
- Full Text :
- https://doi.org/10.1002/polb.24587