In this study, we synthesized homopolymer and random copolymers based on p-phenylenevinylene (PPVs) derivatives
and norbornene-dicarboximide (NDI) using the ring-opening metathesis polymerization (ROMP)
technique with Grubbs second-generation (G2) catalyst. The synthesized polymers include poly(2-[(2-Ethylhexyl)
oxy]-5‑methoxy-p-phenylenevinylene) (EHM-PPV) (P1), random copolymer Carbazole-NDI/2,5-dioctyloxy-
p-phenylenevinylene (CA-NDI/DO-PPV) (P2), and random copolymer CA-NDI/EHM-PPV (P3). UV–Vis
spectroscopy revealed absorption maxima at 468 nm for P1, 457 nm for P2, and 449 nm for P3, with optical band
gaps ranging from 2.32 eV to 2.42 eV. Photoluminescence (PL) studies showed emission peaks at 516 nm for P1,
536 nm for P2, and 526 nm for P3. Electrochemical characterization using CV confirmed band gaps of 2.19 eV for
P1, 2.33 eV for P2, and 2.34 eV for P3, aligning closely with optical measurements. Thermogravimetric analysis
(TGA) demonstrated high thermal stability, with decomposition temperatures ranging from 299.5 ◦C to 421.7 ◦C.
Notably, the incorporation of CA-NDI improved the thermal stability of PPV derivatives. These results highlight
the synergistic combination of NDI and PPVs, which enhances thermal stability performance. This study establishes
NDI-PPV-based random copolymers as promising candidates for advanced optoelectronic applications,
offering new pathways for designing thermally stable, high-performance materials. |
