Preparation and characterization of fibrous sepiolite modified silane coupling agent/fluororubber nanocomposite

Abstract

Fibrous sepiolite(Sep)/fluororubber (FKM) composite was prepared by co-mixing and heat molding. Fibrous aggregation of acid sepiolite(aSep) was prepared by acid exfoliation of mineral sepiolite, and then organic sepiolite(oSep) was prepared by coupling agent modification of aSep. The crystal structure, chemical composition and morphology of different aggregations were mensurated using X-ray diffraction, infrared spectrometer, and scanning electron microscope. The curing histories and mechanical properties of composites were analyzed for two kinds of fibrous sepiolites. The results indicated that apparent diameters of aSep and oSep were respectively 100-200 nm and 60-100 nm. The apparent crosslinking densities, curing velocities, and tensile strengths of FKM composites were increased by the addition of sepiolite, the curing velocities of oSep/FKM were lower than those of aSep/FKM, and the tensile strengths of oSep/FKM were upper than those of aSep/FKM. POLYM. COMPOS., 00:000-000, 2015.

Synthesis of novel colorless polyimides from benzimidazole diamines with various linearity

“…In regard to imide rings, the absorption bands of CO asymmetric stretching (1772 cm −1 ), CO symmetric stretching (1708 cm −1 ) and CN stretching (1367 cm −1 ) prove the formation of them. The absorption peaks of the CO stretching vibration in amic acid (1660 cm −1 ) are almost invisible, which means every PI films is in a complete imidization extent 33,42,43 . As the imidazole ring, the occurrence of absorption peak in imidazole breathing (1319 cm −1 ) and vanishing of NH stretching (near 3405 cm −1 ) in imidazole ring demonstrate that NCH 3 is introduced to monomer structures smoothly.…”

Water Absorption Behavior of Dual-Sponge Structure Sealing Elastomers Assisted by Machine Learning

“…In this study, the aqueous phase system involved uniform mixing of sodium acrylate, acrylamide, and ACM to form a solution. APS, commonly used as an initiator in suspension polymerization, decomposes upon heating to generate sulfate radical ions with unpaired electrons, making them highly active free radicals . These sulfate radicals play a crucial role in initiating the suspension polymerization process.…”

“…APS, commonly used as an initiator in suspension polymerization, decomposes upon heating to generate sulfate radical ions with unpaired electrons, making them highly active free radicals. 19 These sulfate radicals play a crucial role in initiating the suspension polymerization process. MBA was utilized as the cross-linking agent, containing two acrylamide functional groups.…”

Study on the interaction between fluoroelastomer and silica: Characterizations

“…6,8,9 The other type is inorganic filler, such as diatomite, talcum powder, calcium carbonate, barium sulfate, calcium fluoride, metallic oxide, and so forth, which are also frequently used fillers in fluoroelastomers. [10][11][12][13][14][15][16] At the same time, some new fillers, such as graphite/ graphene, [17][18][19][20][21] carbon nanotubes, [22][23][24] carbon fiber, [25][26][27] and so forth, have also received extensive attention. However, the study about the interaction between fluoroelastomer and fillers are few and not systematical.…”

“…Nowadays, there are two categories of fillers used in fluoroelastomers: one is carbon black, especially thermal black such as N990 (classification from ASTM D1765‐2014), which is widely used in fluororubber products 6,8,9 . The other type is inorganic filler, such as diatomite, talcum powder, calcium carbonate, barium sulfate, calcium fluoride, metallic oxide, and so forth, which are also frequently used fillers in fluoroelastomers 10–16 . At the same time, some new fillers, such as graphite/graphene, 17–21 carbon nanotubes, 22–24 carbon fiber, 25–27 and so forth, have also received extensive attention.…”