2024
DOI: 10.1021/acs.macromol.3c02446
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Synthesis of Statistical Multiblock Copolymers through Chain Shuttling Copolymerization with a Thermomechanical Switch Behavior

Antonio Vittoria,
Gaia Urciuoli,
Salvatore Costanzo
et al.

Abstract: A high-throughput experimentation (HTE) approach is adopted for the synthesis of a special class of elastomeric polyolefins with a tailored thermomechanical response. Ethylene/ hexadec-1-ene (E/C16) statistical multiblock copolymers (MBCs) are synthesized through chain shuttling copolymerization (CSC). They are characterized by alternation of crystalline (hard) and amorphous (soft) blocks consisting of E/C16 random copolymers with low (0.5 mol %) and high (22 mol %) C16 content, respectively. The MBCs have sta… Show more

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“…As demonstrated in Figures c,d and S4, the OBCs prepared using a high 1-octadecene dosage of 50 mmol displayed a second melting peak and a second crystallization peak below 10 °C, regardless of the soft block fraction. These T m s and T c s were originated from the side-chain crystallization of 1-octadecene units incorporated in the soft blocks, which may affect the mechanical properties of these OBCs at lower temperatures. , No extra peak from side-chain crystallization was observed in DSC curves for OBCs prepared using a lower 1-octadecene dosage of 25 mmol because the 1-octadecene units were separated far apart by long and continuous propylene sequences in the soft blocks; thus, the possible weak side-chain crystallization was hardly detected.…”
Section: Resultsmentioning
confidence: 98%
“…As demonstrated in Figures c,d and S4, the OBCs prepared using a high 1-octadecene dosage of 50 mmol displayed a second melting peak and a second crystallization peak below 10 °C, regardless of the soft block fraction. These T m s and T c s were originated from the side-chain crystallization of 1-octadecene units incorporated in the soft blocks, which may affect the mechanical properties of these OBCs at lower temperatures. , No extra peak from side-chain crystallization was observed in DSC curves for OBCs prepared using a lower 1-octadecene dosage of 25 mmol because the 1-octadecene units were separated far apart by long and continuous propylene sequences in the soft blocks; thus, the possible weak side-chain crystallization was hardly detected.…”
Section: Resultsmentioning
confidence: 98%