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Highly Efficient Complete Hydrogenation of (Polystyrene‑b‑Poly(styrene-alt-1,3-pentadiene)‑b‑Polystyrene) Triblock
Kun Liu1, Xupeng Han1, Jiahao Zhou1
1Province Key Laboratory for Fine Petrochemical Catalysis and Separation, College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, P. R. China.
We synthesized well-defined triblock copolymers via living anionic polymerization and optimized hydrogenation to create novel multiblock copolymers. These modified polymers offer a balanced impact and flexural strength for transparent resin applications.
Area of Science:
- Polymer Chemistry
- Materials Science
Background:
- Controlled synthesis of polyolefins with specific properties is essential.
- Triblock copolymers offer unique structural possibilities for material design.
Purpose of the Study:
- To synthesize well-defined triblock copolymers (SSPS) with controlled molecular weights and narrow distributions.
- To develop a highly efficient hydrogenation process for SSPS to create novel multiblock copolymers (fhSSPS).
- To investigate the impact of block ratios on the mechanical properties of the resulting copolymers.
Main Methods:
- Living sequential anionic copolymerization for SSPS synthesis.
- Complete hydrogenation using Ni-based catalysts (Raney nickel, Ni0.2@Al2O3).
- Characterization using NMR, FTIR, DSC, and GPC.
- Mechanical property testing (impact, flexural, yield strength).
Main Results:
- Symmetrical triblock copolymers (SSPS) with constant molecular weights (100 kDa) and narrow molecular weight distributions (ĐM < 1.07) were synthesized.
- Novel multiblock copolymers (fhSSPS) with alternating VCH-alt-EP sequences and complete hydrogenation were produced.
- Optimized hydrogenation conditions (temperature, time, pressure, concentration, catalyst dosage) were determined.
- A good balance of impact and flexural strength was achieved at FST = 0.80 for SSPS and FST = 0.76 for fhSSPS.
Conclusions:
- Living anionic polymerization enables precise synthesis of triblock copolymers.
- Efficient Ni-based hydrogenation yields novel multiblock copolymers with defined alternating sequences.
- The block ratio significantly influences the mechanical properties of transparent resins derived from these copolymers.
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