Alloocimene

• CAS: 673-84-7
• Catalog Number: ALC-FP-673847
• Category: Featured Products
• Molecular Weight: 136.23
• Molecular Formula: C10H16
• Synonyms: 2,6-Dimethyl-2,4,6-octatriene
• Appearance: Colorless to yellow liquid
• Sample Lot No.: A24M0313x6L

Case Study

Alloocimene in the Synthesis of Polyisobutylene-Alloocimene Triblock Thermoplastic Elastomers

Roh JH, et al. Polymer, 2015, 56, 280-283.

This case study highlights the experimental application of alloocimene as a functional glassy end-block in the synthesis of novel polyisobutylene (PIB)-alloocimene-PIB triblock copolymers. Alloocimene and isobutylene were sequentially polymerized to construct a well-defined triblock architecture with a high-molecular-weight PIB mid-block and alloocimene terminal blocks. Molecular characteristics were confirmed by ^1H NMR, which quantified an alloocimene content of 25.5 wt%, and by gel permeation analysis, yielding a number-average molecular weight of 260 kg/mol. Dynamic mechanical analysis using parallel-plate and cone-and-plate rheometry revealed significant reinforcement at ambient temperature due to phase-separated glassy alloocimene domains. Temperature-dependent atomic force microscopy, performed under controlled heating, directly visualized morphology evolution across the alloocimene glass transition. Complementary TEM of cryo-microtomed, OsO₄-stained films further confirmed domain structure. Collectively, these experimental methods demonstrate alloocimene's critical role in enabling processable, thermoplastic elastomer networks based on otherwise non-crosslinkable PIB.