Aggregation behavior of new cyclic saturated copolymers synthesized via ring-opening metathesis polymerization

Ogata, Youichi; Makita, Yutaka; Okaniwa, Motoki

doi:10.1016/j.polymer.2008.08.047

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…Actually, in our previous research, we have already confirmed that single chain behavior in dilute solution is closely involved in aggregation behavior of a copolymer with specific molecular structures in both semidilute and concentrated regions 38. In particular, the copolymer had higher values of both A 2 and k D in some dilute solution systems than other dilute solution systems when the copolymer more largely aggregated in the latter semidilute and concentrated solution systems than the former semidilute and concentrated solution systems.…”

Section: Resultssupporting

confidence: 61%

Aggregation behavior of poly(γ‐benzyl‐L‐glutamate)‐b‐polyisoprene‐b‐poly(γ‐benzyl‐L‐glutamate) rod‐coil‐rod triblock copolymer in N,N‐dimethylformamide

Ogata

Iso²,

Kura

et al. 2010

J Polym Sci B Polym Phys

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Solution property of poly(γ‐benzyl‐L‐glutamate)‐b‐polyisoprene‐b‐poly(γ‐benzyl‐L‐glutamate) (GIG copolymer) was studied by using dynamic light scattering and static light scattering for N,N‐dimethylformamide (DMF) solution and DMF/toluene mixed solutions. GIG copolymer proved to aggregate in DMF and under DMF‐rich condition, that is, high‐polar region. The aggregate decreased in size, and completely disappeared under toluene‐rich condition, that is, low‐polar region. The correlation between solubility parameter and aggregate size of GIG copolymer in the DMF/toluene solution systems quantitatively demonstrated how strongly polarity caused by hydrogen bond made an impact on the aggregation behavior. Because the main driving force to the aggregation under DMF‐rich condition originates with polyisoprene (PIP) blocks, the aggregate in DMF is considered to be a core‐shell micelle consisting of flexible PIP core surrounded by rigid poly(γ‐benzyl‐L‐glutamate) (PBLG) shell. The values of dimensionless parameter ρ, defined as the ratio of radius of gyration 〈S2〉1/2 to hydrodynamic radius RH, revealed that a single chain of GIG copolymer had the form of rigid rod with flexibility, that is, once‐broken rod, caused by the incorporation of a flexible PIP chain between two rigid PBLG rods in the DMF/toluene solution system. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 1740–1748, 2010

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Section: Resultssupporting

confidence: 61%

Aggregation behavior of poly(γ‐benzyl‐L‐glutamate)‐b‐polyisoprene‐b‐poly(γ‐benzyl‐L‐glutamate) rod‐coil‐rod triblock copolymer in N,N‐dimethylformamide

Ogata

Iso²,

Kura

et al. 2010

J Polym Sci B Polym Phys

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“…A copolymer was produced through the ROMCP of MMT with dicyclopentadiene (DCP) and subsequent hydrogenation. 30 Due to the higher polymerizability of DCP, gradient or block copolymers were formed, and hydrophobic DCP units were supposed to be aggregated. Domain separation or aggregation in COPs may cause non-uniform optical properties, which are unfavorable for transparent material applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of cyclic olefin polymers by ring-opening metathesis (co)polymerization of α-methyl-substituted norbornene lactones

et al. 2022

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“…4,[10][11][12] In spite of high activity of these catalysts, Ru-catalyzed hydrogenation has a serious drawback in terms of product purification due to contamination by hard-to-remove Ru complexes and low molecular weight side products formed from the polymer chain scission reaction.…”

Section: -4mentioning

confidence: 99%

Ring-Opening Metathesis Polymerization and Hydrogenation of Ethyl-substituted Tetracyclododecene

Kwon¹,

Vo²,

Lee³

et al. 2011

Bulletin of the Korean Chemical Society

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Ring-opening metathesis polymerization (ROMP) of an ethyl-substituted tetracyclododecene (8-ethyltetracyclo[4.4.0.1 2,5 .1 7,10] dodec-3-ene, Et-TCD) was carried out in the presence of a ternary catalyst system consisting of WCl 6 , triisobutyl aluminium (iso-Bu 3 Al), and ethanol. The optimal molar ratio of Et-TCD/WCl 3 / iso-Bu 3 Al/ethanol was found as 500/1/3/2 at which the yield of ring-opened polymer was 100%. 1-Hexene was shown to be an effective molecular weight controlling agent for ROMP reaction of Et-TCD. The hydrogenation of the ring opened polymer (p-Et-TCD) was conducted successfully using Pd(5 wt %)/γ-Al 2 O 3 at 80 o C for 1 h. Chemical structures of p-Et-TCD and its hydrogenated product(H 2 -p-Et-TCD) were characterized using 2D NMR techniques ( H- 13C HSQC). The changes of physical properties such as thermal stability, glass transition temperature and light transmittance after the hydrogenation were also investigated using TGA, DSC, and UV.

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Aggregation behavior of new cyclic saturated copolymers synthesized via ring-opening metathesis polymerization

Cited by 7 publications

References 23 publications

Aggregation behavior of poly(γ‐benzyl‐L‐glutamate)‐b‐polyisoprene‐b‐poly(γ‐benzyl‐L‐glutamate) rod‐coil‐rod triblock copolymer in N,N‐dimethylformamide

Aggregation behavior of poly(γ‐benzyl‐L‐glutamate)‐b‐polyisoprene‐b‐poly(γ‐benzyl‐L‐glutamate) rod‐coil‐rod triblock copolymer in N,N‐dimethylformamide

Synthesis and properties of cyclic olefin polymers by ring-opening metathesis (co)polymerization of α-methyl-substituted norbornene lactones

Ring-Opening Metathesis Polymerization and Hydrogenation of Ethyl-substituted Tetracyclododecene

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