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

Abstract

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.

Photocured Materials with Self-Healing Function through Ionic Interactions for Flexible Electronics

“…As for IB10-IM5 and IB9-IM5, the moduli showed an additional glassy region. Unlike the common ionomers, − our samples did not exhibit the ionic plateau and cluster glass transition, suggesting that IM-A did not form large ionic clusters or microphase separation in the solid state. As shown in Figure a, for the systems with varying ratio of IBOA to EOEOEA, the glassy region became narrow with the decrease in the IBOA content and the moduli drop also shifted to the low-temperature region.…”

Synthesis of self-healing waterborne polyurethanes containing sulphonate groups

“…28,29 Besides, PU-60U has a slight increment in d value due to the le shi of 2q, which indicates a larger cluster size than PU-50U. 30 This phenomenon strongly depends on the exibility of the polymer backbone. 29,31 This is the reason why the increase in the so segment contents contributes to the self-healing performances.…”

Damping properties of acrylate polymers mediated by ionic coordination

“…That is, Eisenberg et al held that the loss factor peaks at higher-temperature in DMA originated from the glass transition of clusters, which is consistent with the results in small angle x-ray scattering (SAXS) curves showing microphase separation. [43][44][45][46][47] Kim et al 21 pointed out that the glass transition temperature T g,2 of clusters may be influenced by both the degree of clustering and the ionic coordination strength.…”

“…[14][15][16][17][18] However, these organic small molecules tend to self-aggregate and crystallize, resulting in the degradation of damping properties during long-time service. 19,20 Ionomers, refer to polymers containing ionizable groups in the molecule chains, 21,22 have been widely used in many fields, such as membranes, packaging, and coatings materials. 23,24 The ionic groups tend to form nanoscale clusters with sufficient high ionic concentration due to both the electrostatic interactions between ionic groups and the difference in polarities of polymer hydrocarbon matrix and ionic groups, [25][26][27] which endow polymer materials with two damping peaks.…”