Hydrogenation of polybutadienes. Microstructure and thermal properties of hydrogenated polybutadienes

Doi, Yoshiharu; Yano, Akihiro; Soga, Kazuo; Burfield, David R.

doi:10.1021/ma00163a013

Cited by 52 publications

(32 citation statements)

References 10 publications

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“…In the case of 60% hydrogenation, only the absorption of the trans 1,4-units persists ( Figure 2B), which indicates that the double bonds of cis 1,4-units and 1,2-units are much more reactive towards hydrogenation than the trans 1,4-units, possibly because of less steric hindrance. The same observation was reported for the hydrogenation of PBD in the presence of a soluble Rh catalyst [27]. After complete hydrogenation, the typical absorptions of C=C double bonds at 1640, 960 and 910 cm -1 are no longer observed ( Figure 2C), the residual absorptions at 960 and 910 cm -1 being due to PMMA as shown by Figure 2D for homoPMMA of the same molecular weight and tacticity as the PMMA end block.…”

Section: Synthesis Of Block Copolymerssupporting

confidence: 83%

Synthesis and characterization of hydrogenated poly[alkylmethacrylate(-b-styrene)-b-butadiene-b-(styrene-b-) alkylmethacrylate] triblock and pentablock copolymers

Yu¹,

Yu²,

Dubois³

et al. 1997

Polymer

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Triblock and pentablock copolymers of the X(Y)B(Y)X type have been synthesized by the sequential living anionic polymerization of butadiene (B), styrene (Y) and alkylmethacrylate (X), respectively. The diadduct of tBuLi onto m-diisopropenylbenzene (m-DIB) has been used as a difunctional initiator. Methylmethacrylate (MMA), t-butylmethacrylate (tBMA) and isobornylmethacrylate (IBMA) have been used as precursors of the outerblocks X. The polybutadiene (PBD) midblock that contains ca 42-45% 1,2-units has been selectively hydrogenated into a saturated poly(ethylene-co-1-butene) (PEB) block. The homogeneous hydrogenation catalysis has no deleterious effect on the copolymer integrity. These completely soluble thermoplastic elastomers have been characterized by FT i.r., n.m.r., d.s.c. and d.m.a. The PEB midblock has a low T g (-50°C) and a small propensity to crystallize. The effect of hydrogenation on the morphology and mechanical properties depends on the outer block. Upon hydrogenation of the PBD midblock in polymethylmethacrylate (PMMA) and polyisobornylmethacrylate (PIBMA) containing triblock copolymers, the ultimate tensile strength is increased (except for a hard block content > 50%) due to a sharper phase separation, whereas the elongation at break is decreased. The extent of phase separation is reduced in polyt-butylmethacrylate(PtBMA) containing triblock copolymers upon hydrogenation and the ultimate tensile strength is slightly decreased. Stereocomplexation of the syndiotactic PMMA outerblocks is observed to occur upon blending with isotactic PMMA

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Section: Synthesis Of Block Copolymerssupporting

confidence: 83%

Synthesis and characterization of hydrogenated poly[alkylmethacrylate(-b-styrene)-b-butadiene-b-(styrene-b-) alkylmethacrylate] triblock and pentablock copolymers

Yu¹,

Yu²,

Dubois³

et al. 1997

Polymer

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“…Almost 90 mol ' 36 hydrogenation is obtained at 60"C, under 1. 4 MPa hydrogen pressure, 40 mg catalyst (for 2 g polymer) in chloroform-acetone solution for a time period of 1 h.…”

Section: Discussionmentioning

confidence: 99%

Selective hydrogenation of olefinic bonds in styrene‐isoprene‐styrene triblock copolymer by palladium acetate catalyst

Bhattacharjee

Rajagopalan

Bhowmick

et al. 1993

J of Applied Polymer Sci

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SYNOPSISHomogeneous catalytic hydrogenation of styrene-isoprene-styrene triblock copolymer ( SIS ) has been carried out selectively at the carbon-carbon double bond in the presence of palladium acetate catalyst under mild conditions. Degree of hydrogenation has been calculated with the help of infrared and nuclear magnetic resonance spectroscopic techniques. Almost 90 mol % complete hydrogenation has been achieved at 60°C under 1.4 MPa hydrogen pressure, 40 mg catalyst (for 2 g of polymer) in chloroform-acetone solution for 1 h.

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“…A polybutadiene with 18% 1,2units leads to a copolymer with 9.9% butene according to Eq. (2): [59] x B…”

Section: Microstructurementioning

confidence: 95%

Gas-phase polymerization of 1,3-butadiene with supported half-sandwich-titanium-complexes

Kaminsky¹,

Strübel

2000

Macromol. Chem. Phys.

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Hydrogenation of polybutadienes. Microstructure and thermal properties of hydrogenated polybutadienes

Cited by 52 publications

References 10 publications

Synthesis and characterization of hydrogenated poly[alkylmethacrylate(-b-styrene)-b-butadiene-b-(styrene-b-) alkylmethacrylate] triblock and pentablock copolymers

Synthesis and characterization of hydrogenated poly[alkylmethacrylate(-b-styrene)-b-butadiene-b-(styrene-b-) alkylmethacrylate] triblock and pentablock copolymers

Selective hydrogenation of olefinic bonds in styrene‐isoprene‐styrene triblock copolymer by palladium acetate catalyst

Gas-phase polymerization of 1,3-butadiene with supported half-sandwich-titanium-complexes

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