Small-angle neutron scattering studies on the miscibility of deuterated polysulfone and modified polysulfone blends

Takeno, H.; Hashimoto, Takeji; Weber, Martin; Schuch, Horst; Koizumi, Satoshi

doi:10.1016/s0032-3861(99)00298-0

Cited by 5 publications

(9 citation statements)

References 7 publications

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“…In another study, the hydroxyl telechelic polysulfones were mixed with diglycidyl ether of bisphenol A type epoxy resin and organo‐modified montmorillonite nanoclays to obtain hybrid nanocomposites . Various reactive groups, aliphatic hydroxyethyl, phthalic anhydride, (meth)acrylates and benzoxazine groups, were also introduced to hydroxy end‐functionalized polysulfones by addition of ethylene carbonate, 4‐fluorophthalic anhydride, (meth)acryloyl chlorides and aniline/paraformaldehyde. The resulting telechelics were used as crosslinkers, chain extenders and important building blocks for various macromolecular structures, including block and graft copolymers and hybrid networks.…”

Section: Chemical Functionalizationmentioning

confidence: 99%

Recent advances in the preparation of functionalized polysulfones

Dizman

Taşdelen

Yaǧcı

2013

Polymer International

122

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Section: Chemical Functionalizationmentioning

confidence: 99%

Recent advances in the preparation of functionalized polysulfones

Dizman

Taşdelen

Yaǧcı

2013

Polymer International

122

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“…Takeno et al studied the miscibility of several polymer pairs prepared out of a given dPSU and two modified PSUs denoted by PSU-R1 and PSU-R2 by SANS. PSU-R1 and PSU-R2 are protonated PSU polymers with one phthalic anhydride end group and differ only in their molecular weight with a number-average degree of polymerization N = 40 (PSU-R1) and N = 171 (PSU-R2), respectively.…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…For simplicity, the two homopolymers are assumed to have equal segment lengths. According to work regarding the miscibility of a dPSU and hydrogenous PSU-R mixture reported by Takeno et al, one obtains l = 27 Å. The volume occupied by one PSU repeat unit is 1/ ρ 0 = 648 Å 3 .…”

mentioning

confidence: 94%

Interface between a Polysulfone and Polyamide As Studied by Combined Neutron Reflectivity and Small-Angle Neutron Scattering Techniques

Hayashi¹,

Hashimoto²,

Hasegawa³

et al. 2000

Macromolecules

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Interfaces between the two phases formed in immiscible polymer pairs were studied by means of neutron reflectivity (NR) combined with small-angle neutron scattering (SANS). The interfacial widths evaluated by the two methods were compared for two systems: a nonreactive system composed of polyamide (PA) and polysulfone (PSU) and a reactive system composed of PA and PSU with a phthalic anhydride reactive end group (PSU-R) in which PSU-b-PA block copolymers can be formed at the interface. SANS measurements were made on bulk mixtures, and the NR measurements were performed on thin film bilayer stacks of PA and PSU or PSU-R. The intrinsic interfacial widths, W I,diffuse, obtained from the two methods were compared for the samples that underwent similar annealing protocols and were quenched below the glass transition temperatures Tg's to room temperature. A consistent result for WI,diffuse can be obtained for the two methods only after taking into account the following important factors: (i) the SANS intensity should be corrected for the frozen density heterogeneities within each phase as well as the frozen thermal composition fluctuations; (ii) the contribution of capillary wave fluctuations to a net (or observed) interfacial width, WI,obs, is more significant for NR than SANS. Without the former correction, the SANS profiles at high scattering vector, q, showed asymptotic behavior of q -n (n < 4), giving an erroneous conclusion on WI,obs. The WI,obs values obtained for the reactive system were found to be larger than those for the nonreactive system for both methods, reflecting block copolymer formation at the interfaces. The interfacial area density, Σ, for the bulk mixture of the reactive system rapidly decreased with time and reached a constant value within ca. 2 min after annealing above the Tg's, while Σ for the nonreactive system kept decreasing with time. This elucidates that the growth of the phaseseparating domains in the reactive system was pinned by the formation of block copolymers at the interfaces during early annealing times.

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“…29 This polymer is typically synthesized via a polycondensation route where the disodium salt of bisphenol A and bis(4-chlorophenyl) sulfone are reacted to produce the poly(ether sulfone) with α,ωhydroxy polymer termini [α,ω-PSU(OH) 2 ]. 30,31 Elaboration of this α,ω-PSU(OH) 2 structure into cross-linkable thermosets has been demonstrated by converting these hydroxyl chain ends into aliphatic hydroxyethyls, 32 (meth)acrylates, 33 phthalic anhydrides, 34 or benzoxazine groups. 35,36 In the latter, Ates et al reported that the preparation and polymerization of α,ωbenzoxazine-functionalized PSU and its thick films were found to have increased thermal and mechanical stability.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Accordingly, polysulfones are often used in manufacturing medical devices such as anesthesia masks, heart valve sizers, dialysis filtration cartridges and catheters, water filters, fuel cell membranes, filaments for 3D printing, and gas separation membranes . This polymer is typically synthesized via a polycondensation route where the disodium salt of bisphenol A and bis(4-chlorophenyl) sulfone are reacted to produce the poly(ether sulfone) with α,ω-hydroxy polymer termini [α,ω-PSU(OH) 2 ]. , Elaboration of this α,ω-PSU(OH) 2 structure into cross-linkable thermosets has been demonstrated by converting these hydroxyl chain ends into aliphatic hydroxyethyls, (meth)acrylates, phthalic anhydrides, or benzoxazine groups. , In the latter, Ates et al reported that the preparation and polymerization of α,ω-benzoxazine-functionalized PSU and its thick films were found to have increased thermal and mechanical stability . The relative benzoxazine content in many of these systems remains relatively low with molar percentages seldom exceeding 15 mol % in thin films.…”

Section: Introductionmentioning

confidence: 99%

Improved Resilience and Uniformity in Polysulfone Blends from an Accelerated Grafting Ring-Opening Polymerization Reaction with Benzoxazine

et al. 2021

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BPA-based benzoxazine monomer (BA-a) solubilized in end-group ditosylated poly(ether sulfone) [α,ω-PSU(OTs) 2 ] undergoes an accelerated grafting ring-opening polymerization (ROP) to afford unique graft copolymer hybrids with predictable thermal properties and improved uniformity and superior mechanical properties. The α,ω-PSU(OTs) 2 was synthesized from the parent α,ω-dihydroxy poly(ether sulfone) with the conversion of end-groups quantified by 1 H NMR and GPC. The two polymers were used to create two blend series with a BPA-based benzoxazine monomer (BA-a) and heated to the polybenzoxazine-based products. The grafting ROP reaction of tosylated poly(ether sulfone) with the resulting polybenzoxazine network was studied by using DSC, FT-IR, SEM, and UV−vis and indicated that tosylated end-groups accelerate BA-a polymerization and afford products that are composed of P(BA-a)-graft-PSU with excess but well-mixed PSU. The approach allows for the fabrication of free-standing films that had higher tensile modulus, greater resiliency, and less mechanical property variation compared to their α,ω-dihydroxy poly(ether sulfone) analogues. The properties of the tosylated poly(ether sulfone) blend films and the accelerated cure of included benzoxazine allowed for the preparation of thin films on millimeter-scaled metal rods where the mechanically robust films do not undergo significant melt flow when cured by inductive heating.

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Small-angle neutron scattering studies on the miscibility of deuterated polysulfone and modified polysulfone blends

Cited by 5 publications

References 7 publications

Recent advances in the preparation of functionalized polysulfones

Recent advances in the preparation of functionalized polysulfones

Interface between a Polysulfone and Polyamide As Studied by Combined Neutron Reflectivity and Small-Angle Neutron Scattering Techniques

Improved Resilience and Uniformity in Polysulfone Blends from an Accelerated Grafting Ring-Opening Polymerization Reaction with Benzoxazine

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