Dynamic mechanical and melt rheological properties of sulfonated poly(butylene succinate) ionomers

Han, Sangil; Im, Seung Soon; Kim, Dong Kuk

doi:10.1016/s0032-3861(03)00673-6

Cited by 62 publications

(60 citation statements)

References 27 publications

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“…In order to surpass this shortcoming, some authors have introduced the ionomer approach into the field of bio-based polyesters [18,19]. Han et al [9,20] inserted ionic groups into the PBS main chain leading to an improved extensibility due to reduction of crystallinity as well as a noticeable modification in melt rheological properties due to the ionic interactions. PBS ionomers have been proposed as a solution for the brittleness and poor processability of other polymers.…”

Section: Introductionmentioning

confidence: 99%

Poly(butylene succinate) Ionomers with Enhanced Hydrodegradability

et al. 2015

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A series of poly(butylene succinate) (PBS) ionomers containing up to 14 mol% of sulfonated succinate units have been synthesized by polycondensation in the melt-phase. The copolyesters were obtained with weight average molecular weights oscillating between 33,000 and 72,000 g·mol−1. All copolyesters were semicrystalline with melting temperatures and enthalpies decreasing and glass transition temperatures increasing with the content of ionic units. The thermal stability of PBS was slightly reduced by the incorporation of these units, and it was also found that the copolyesters were stiffer but also more brittle than PBS. The hydrolytic degradability of PBS was enhanced by copolymerization, an effect that was much more pronounced in basic media.

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Section: Introductionmentioning

confidence: 99%

Poly(butylene succinate) Ionomers with Enhanced Hydrodegradability

et al. 2015

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“…Increasing ion content led to a decrease in the crystallization rate of the POBS ionomer as well as a decrease in the degree of crystallization. In a previous paper, 17 we reported that ionic units might be expelled from the crystalline region, leading to poor packing for the crystallization of the ionomer. Figure 11 shows the WAXD pattern for crystallized PBS and POBS-2.0i samples for 1 and 48 h at 80 1C.…”

Section: Pbs Ionomermentioning

confidence: 90%

“…17,22 Figure 10 shows a representative 1 H-nuclear magnetic resonance (NMR) spectrum for homoPBS and POBS-2.0i with characteristic peak assignment to confirm the chemical structure of the POBS ionomer. The chemical structure of PBS can be assigned at 4.1, 2.6 and 1.7 p.p.m., and the integration ratio is 1:1:1, indicating that the synthesis of PBS was completed.…”

Section: Pbs Ionomermentioning

confidence: 99%

“…[12][13][14][15] In order to overcome these shortcomings, the ionomer concept has been employed in the field of PBS. [16][17][18][19][20][21][22] An ionomer is defined as an ioncontaining polymer with a small amount (usually up to 10-15 mol%) of ionic groups along the backbone chains or as pendant groups. Ionomers have been extensively studied because they exhibit significant changes in their physical properties owing to the formation of ionic aggregates such as enhanced mechanical properties, high melt viscosity and increased thermal properties.…”

Section: Introductionmentioning

confidence: 99%

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The synthesis of copolymers, blends and composites based on poly(butylene succinate)

Hwang

Yoo

2012

Polym J

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Poly(butylene succinate) (PBS) is one of the most available environmentally degradable polymers used in industrial applications. Biodegradable polyesters including PBS have low thermal stability, poor mechanical properties and slow crystallization rates. For this reason, many researchers have investigated PBS composites, especially nanocomposites with functional inorganic materials, to identify other advanced properties. We used two inorganic materials to investigate how nanoparticles could be dispersed in a PBS matrix and to identify the properties that could be advanced by fabricating well-dispersed PBS nanocomposites. Clay and zeolite were used for the nano components because they are well known and widely used inorganic materials in polymer-inorganic nanocomposites. The most challenging problem when fabricating the clay-polymer nanocomposite has been how to separate the clay layers in the composite to overcome the very strong cohesive energies between the clay layers. Numerous studies have introduced modifiers into silicate layers to increase the basal space and facilitate easier polymer chain incorporation. We introduce a urethane group on a clay surface to develop physically enhanced PBS/montmorillonite (MMT) nanocomposites. A series of PBS-based ionomers are synthesized by two-step polycondensation. This study focuses on the effect of the ionic group on dynamic mechanical properties, melt rheology, crystallization behavior and enzymatic hydrolysis. INTRODUCTIONThere has been considerable interest in aliphatic biodegradable polyesters over the last decade because of increased concerns about environmental conservation. 1-9 Among aliphatic biodegradable polyesters, poly(butylene succinate) (PBS) is considered to be a promising material in many fields because it has excellent biodegradability, melt processibility and chemical resistance. However, PBS has limited applications because of its poor thermal stability and mechanical properties.PBS/inorganic nanocomposites have been proposed to overcome these drawbacks, and are being developed as the next generation of biodegradable materials. Numerous studies of clay-based biodegradable polymer nanocomposites have focused on changes in preparation methods and morphological properties, as well as the enhancement of mechanical and thermal properties. 10,11 Ray et al. 10 investigated the degree of exfoliation of PBS/clay nanocomposites with various clay types and demonstrated control of the flocculation of dispersed silicate layers in PBS/clay nanocomposites. The achievement of a fine dispersion of the nanofiller in a polymer matrix is a key problem when attempting to produce biodegradable polymer/clay nanocomposites. As noted above, homogeneous clay dispersions in biodegradable polymer matrix are difficult to achieve because of the strong tendency of clay particles to agglomerate. In previous studies, biodegradable polymer nanocomposites with fully dispersed clay were obtained only when the following factors were considered:

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“…It should be remembered that in case of Nafion, ionic -SO 3 H groups are present in the pendant side chains, compared to those present in the main chain of SPVdF. This resulted in lesser interactions between the -SO 3 H groups present within the Nafion structure, compared to that present within the SPVdF structure [51]. Although the tensile loss modulus value of the SPN-4 membrane, at higher temperature (i.e.…”

Section: Rheology Of the Blend Membranesmentioning

confidence: 98%

Partially Sulfonated Poly(vinylidene fluoride) Induced Enhancements of Properties and DMFC Performance of Nafion Electrolyte Membrane

et al. 2015

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Partially sulfonated poly(vinylidene fluoride) (SPVdF) has been prepared by incorporation of sulfonic acid groups within poly(vinylidene fluoride), using chlorosulfonic acid as the sulfonating agent. The degree of sulfonation (DS) has been varied by modulating the duration of the sulfonation reaction. Blending of SPVdF (having DS = 36.78%) with Nafion at a constituent wt.% ratio of SPVdF:Nafion = 70:30 has resulted in the fabrication of polymer electrolyte membrane with superior properties compared to pristine Nafion-117 membrane. This particular blend composition exhibited a proton conductivity value of 3.6 10 -2 S cm -1 (i.e.~12.5%increase over Nafion-117), a methanol permeability value of 6.81 10 -7 cm 2 s -1 at 6M methanol concentration (i.e.~99.31% decrease from Nafion-117) and a corresponding membrane selectivity value of 5.29 10 4 Ss cm -3 (i.e. anincrease of approximately two-orders of magnitude over Nafion-117) at 20°C. In addition, this blend composition has also exhibited (a) better heat stability at temperatures as high as 160°C by virtue of it possessing higher glass transition temperature, (b) higher storage modulus, (c) higher stress relaxation at high angular frequency and (d) superior DMFC performance at high methanol feed concentration in presence of humidified, as well as, non-humidified air as the catholyte, compared to Nafion-117 membrane.

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Dynamic mechanical and melt rheological properties of sulfonated poly(butylene succinate) ionomers

Cited by 62 publications

References 27 publications

Poly(butylene succinate) Ionomers with Enhanced Hydrodegradability

Poly(butylene succinate) Ionomers with Enhanced Hydrodegradability

The synthesis of copolymers, blends and composites based on poly(butylene succinate)

Partially Sulfonated Poly(vinylidene fluoride) Induced Enhancements of Properties and DMFC Performance of Nafion Electrolyte Membrane

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