## 4 Conclusions
Finally, the thermal properties of the four copolymers are suitable for optoelectronic applications since their degradation onset temperatures were above 250 \({}^{\circ}\)C.  
The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/app12094494/s1](https://www.mdpi.com/article/10.3390/app12094494/s1)]([https://www.mdpi.com/article/10.3390/app12094494/s1](https://www.mdpi.com/article/10.3390/app12094494/s1)), Figure S1: 1H NMR spectrum of di-bromoBTPBF (400 MHz, CDCl\({}_{3}\)); Figure S2: 1H NMR spectra of P(DPP-DPPEH) (400 MHz, TCE, 125 \({}^{\circ}\)C); Figure S3: 1H NMR spectra of P(DPP-DPPC12) (400 MHz, TCE, 125 \({}^{\circ}\)C); Figure S4: 1H NMR spectrum of P(DPP-DPP-DAP) (400 MHz, TCE, 125 \({}^{\circ}\)C); Figure S5: 1H NMR spectrum of P(DPP-BTPBF) (400 MHz, TCE, 125 \({}^{\circ}\)C); Figure S6: Optimized geometries of DPP (top) and DAP (middle) with the lateral tetrahydrothiophene groups in anti (a,c) and syn (b,d) positions, and optimized structure of BTPBF (e);Figure S7: Optimized geometries of (DPP-DPP)2 (a,d), (DPP-DAP)2 (b,e), and (DPP-BTPBF)2 (c,f) in their anti (top) and syn (bottom) configurations; Figure S8: Cyclic voltammograms of P(DPP-DPPeH) in 0.1 M Bu4 NP6\(/\)CH3 CN using a sweep rate of 0.1 V s\({}^{-1}\); Figure S9: Cyclic voltammograms of P(DPP-DPPC12) in 0.1 M Bu4 NP6\(/\)CH3 CN using a sweep rate of 0.1 V s\({}^{-1}\); Figure S10: Cyclic voltammograms: reduction (left) and oxidation (right) of P(DPP-DAP) in 0.1 M Bu4 NP6\(/\)CH3 CN using a sweep rate of 0.1 V s\({}^{-1}\); Figure S11: Cyclic voltammograms: reduction (left) and oxidation (right) of P(DPP-BTPBF) in 0.1 M Bu4 NP6\(/\)CH3 CN using a sweep rate of 0.1 V s\({}^{-1}\); Figure S12: Thermograms of P(DTS-DPP) and P(DTS-DAP) with a heating rate of 10 \({}^{\circ}\)C min\({}^{-1}\) under nitrogen; Figure S13: Thermogram of P(DTS-BTPBF) with a heating rate of 10 \({}^{\circ}\)C min\({}^{-1}\) under nitrogen; Figure S14: DSC thermogram of P(DPP-DPPeH) with a heating ramp of 10 \({}^{\circ}\)C min\({}^{-1}\); Figure S15: DSC thermogram of P(DPP-DPPeT2) with a heating ramp of 10 \({}^{\circ}\)C min\({}^{-1}\); Figure S16: DSC thermogram of P(DPP-DAP) with a heating ramp of 10 \({}^{\circ}\)C min\({}^{-1}\); Figure S17: DSC thermogram of P(DPP-BTPBF) with a heating ramp of 10 \({}^{\circ}\)C min\({}^{-1}\); Table S1: Relative Gibbs free energy between _syn_ and _anti_ configurations calculated for (A-A)2 dimers at the M06-2X/6-311G(d) level in the gas phase; Table S2: HOMO and LUMO energies and gaps [AE] g = E_LUMO-E_HOMO (all values in eV) calculated for monomers and A-A' units at the M06-2X/6-311G(d) level; Table S3: HOMO and LUMO energies and gaps [AE] g = E_LUMO-E_HOMO (all values in eV) calculated for increasingly large oligomers at the M06-2X/6-311G(d) level; Table S4: Characterization of the S0\(\rightarrow\)S1 electron transition in increasingly large D-A oligomers, as calculated at the M06-2X/6-311G(d) level in the gas phase. Transition energies (eV), wavelengths (nm), oscillator strengths (dimensionless), amount of charge transferred (|e|), charge transfer distances (A), and change in dipole moments (D); Table S5: Characterization of the S0\(\rightarrow\)S1 electron transition in increasingly large D-A oligomers, as calculated at the IEFPCM:M06-2X/6-311G(d) level in chlorobenzene. Transition energies (eV), wavelengths (nm), oscillator strengths (dimensionless), amount of charge transferred (|e|), charge transfer distances (A), and change in dipole moments (D); Table S6: Comparison of optoelectronic properties of A-A' copolymers (bold) to D-A analogous copolymer; \(\lambda_{\text{max}}\), \(\lambda_{\text{edge}}\) and \(\text{E}_{\text{g}}\)\({}^{\text{opt}}\) were obtained from UV-Visible-NIR absorption spectra; \(\text{E}_{\text{g}}\)\({}^{\text{cc}}\), HOMO and LUMO levels were estimated from cyclovoltammetry measurements. Conceptualization, C.L.-D. and A.B. ; investigation, W.K., H.A., S.B., G.H.R., B.O. and F.C. ; resources, C.L.-D., A.B. and L.H.