Preferential cluster-phase plasticization of ionomers containing surfactant molecules

Kim, Joon Seop; Roberts, S.; Eisenberg, Adi; Moore, Robert B.

doi:10.1021/ma00071a043

Cited by 45 publications

(39 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6 found that the addition of sodium dodecylbenzenesulfonate, SDBS, to sodium sulfonated polystyrene ionomers resulted in large decrease in the cluster Tg. The matrix Tg decreased only slightly.…”

Section: Tgmentioning

confidence: 99%

Effects of Organic Salts on Dynamic Mechanical Properties of Styrene Ionomers

Nah

Kim

et al. 1999

Polym J

View full text Add to dashboard Cite

Polymers of low dielectric constants, contammg relatively small amounts of ionic comonomers, frequently show microphase-separation. 1 · 2 This is caused by ion aggregation within the relatively nonpolar matrix. It is generally accepted that ion-pairs aggregates form quadruplets, sextuplets, and higher aggregates, called multiplets. 3 Ion aggregation leads to reduction in the mobility of surrounding matrix segments. At high ion concentrations, overlap of the restricted mobility regions occurs and gives rise to larger contiguous regions, called clusters, 4 in which the material exhibits a second glass transition temperature ( Tg) higher than that of the matrix Tg.Since ionomers have nonpolar matrix regions and polar multiplets, the selective plasticization of ionomers should be possible. 2.5 A plasticizer affects selectively either multiples or a matrix phase, or both. Thus, we can choose plasticizers to achieve particular properties of ionomers.Recently, Kim eta!. 6 found that the addition of sodium dodecylbenzenesulfonate, SDBS, to sodium sulfonated polystyrene ionomers resulted in large decrease in the cluster Tg. The matrix Tg decreased only slightly. The presence of the SDBS molecules thus led to plasticization of the ionic clusters. This preferential plasticization is the result of incorporation of ionic groups of SDBS molecules into multiplets, with nonpolar alkyl chains of SDBS residing in the reduced mobility regions. Orler et al. 7 compared the plasticization effects of sodium benzenesulfonate (SBS) to those of SDBS in sulfonated polystyrene ionomers. They found that the SBS depresses the cluster Tg slightly without affecting the matrix Tg, and that decrease in the cluster Tg is less in systems plasticized with the SDBS. Tong and Bazuin 8 observed an unusual plasticization effect on the properties of poly(ethyl acrylate-co-sodium acrylate) ionomers plasticized with sodium hexadecanoate. Sodium hexadecanoate was crystalline and remained phase-separated when mixed with the ionomer, and phase-separated organic salts acted as merely filler.In the present study, we explore the effects of changing a carboxylate ionic group to a sulfonate ionic group and the effects of the amounts of organic salts. Thus, taking t To whom correspondence should be addressed.poly(styrene-co-sodium methacrylate) ionomer as the first system, comparison is made between dynamic mechanical properties of ionomers mixed with sodium ptoluate (To!) and sodium p-toluenesulfonate (Sui) salts. Then, we take poly(styrene-co-sodium styrenesulfonate) ionomer as the second system, and compare the properties of ionomers containing To! salts to those of ionomers containing Sui salts. The dependence of clustering on filler effects is addressed briefly. EXPERIMENTAL Sample PreparationTwo poly(styrene-co-methacrylic acid) samples were prepared by bulk free radical polymerization of styrene and methacrylic acid monomers. Polystyrene (MW = ca. 300000) was also prepared by bulk free radical polymerization. The sulfonation method developed by Makowski et...

show abstract

Section: Tgmentioning

confidence: 99%

Effects of Organic Salts on Dynamic Mechanical Properties of Styrene Ionomers

Nah

Kim

et al. 1999

Polym J

View full text Add to dashboard Cite

show abstract

“…[21][22][23][24][25][26][27] Under a certain amount, the organic salts aggregate with the ionic groups. Most of them treat the plasticizing and filling effects of functional organic salts.…”

Section: Introductionmentioning

confidence: 99%

Ionic nanocomposite networks in poly(styrene‐co‐methacrylic acid) copolymers with calcium carbonate

Chevallier¹,

Ni²,

Vera³

et al. 2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

To create reversible supramolecular ionic networks, ionic cross-links were formed from acid pendant functions in poly(styrene-co-methacrylic acid) copolymers by the addition of calcium carbonate. The random dispersion of acid functions in the polystyrene chain is ensured by NMR analysis. The partial reaction of the calcium carbonate with the carboxylic acids is highlighted by a limewater test. The influence of methacrylic acid and calcium-carbonate contents on the formation of an ionic network has been studied through solubility tests. Two main effects were obtained: the exfoliation of the unreacted calcium carbonate characterized by TEM is due to ionic interactions at the surface of nanometric particles that form the first level of organization of the calcium carbonate. Another part of the calcium carbonate reacts with carboxylic acid and is detached from particles to form clusters as shown by x-ray analysis. Finally, by analyzing the dynamic rheological spectrum, the conclusion that the strength of the ionic bonds arises with the calcium content is made. The interest of such an approach with a wide range of observed phenomena in the material is a one-batch process to make thermoreversible nanocomposite networks.

show abstract

“…Figure shows the plots of the E a s for the glass transitions of the matrix and cluster regions of the SSPMANa, SMANa and SSNa ionomers as a function of ion content. Some of the E a s of the SSNa and SMANa ionomers were obtained from elsewhere . It is seen that the E a s for the matrix T g and cluster T g do not change significantly with ion content; the average E a for the matrix T g is 500 ± 51 kJ/mol and that for the cluster T g is 206 ± 34 kJ/mol.…”

Section: Resultsmentioning

confidence: 96%

Effects of Na‐sulfopropyl groups on the mechanical properties and morphology of polystyrene‐co‐methacrylate ionomers

Luqman

Kim

et al. 2016

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

ABSTRACT:The dynamic mechanical properties and morphology of poly(styrene-co23-sulfopropyl sodium-methacrylate) SSPMANa ionomers were investigated. It was found the increasing rate of ionic moduli of the SSPMANa ionomer was very low, and the cluster T g of the ionomers remained more or less constant with increasing ion content. A well-developed SAXS peak was seen for low ion content SSPMANa ionomers and the peak position changed slightly with ion content. Thus, it was suggested that the presence of the alkyl ester side chains made the ion pairs form multiplets more easily at their prevalent distances, and the small-agglomerated multiplets were dispersed in the polymer matrix relatively evenly. The interpretation of ionic moduli using a number of theories implied that the multiplets and clusters acted as effective crosslinks and filler particles, respectively, and the size and shape of the clusters were irregular.

show abstract

Preferential cluster-phase plasticization of ionomers containing surfactant molecules

Cited by 45 publications

References 3 publications

Effects of Organic Salts on Dynamic Mechanical Properties of Styrene Ionomers

Effects of Organic Salts on Dynamic Mechanical Properties of Styrene Ionomers

Ionic nanocomposite networks in poly(styrene‐co‐methacrylic acid) copolymers with calcium carbonate

Effects of Na‐sulfopropyl groups on the mechanical properties and morphology of polystyrene‐co‐methacrylate ionomers

Contact Info

Product

Resources

About