Morphology and properties of polydimethylsiloxane-modified epoxy resin

Abstract

The morphology and fracture toughness of epoxy resins modified with amino-terminated polydimethylsiloxane (ATPDMS), differing in their molecular weight, and the degree of the preliminary reaction in the melt state were investigated. Tetramethyl biphenol diglycidyl ether (TMBPDGE) was used as the base epoxy resin. The degree of preliminary reaction between epoxy and polysiloxane increased with the decrease of the molecular weight of polysiloxane in the melt state. When the low molecular weight polysiloxane (AT900) was mixed with high molecular weight polysiloxane in the preliminary reaction, the low molecular weight polysiloxane enhanced the compatibility between the epoxy resin and the high molecular weight polysiloxane and produced smaller size and narrow distribution of polysiloxane particles. The small and highly concentrated polysiloxane particles, as determined by scanning electron microscopy improved the fracture toughness of the epoxy resin. ᭧ 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: [941][942][943][944][945][946][947][948][949][950][951][952][953][954][955] 1997

Superabsorbent composite. XIII. Effects of Al3+‐attapulgite on hydrogel strength and swelling behaviors of poly(acrylic acid)/Al3+‐attapulgite superabsorbent composites

“…The role of Al 3þ -APT is illustrated in Scheme 1. This result is in accordance with the effect of Al 2 (SO 4 ) 3 in the poly(acrylamide-co-acrylic acid) system as reported by Chen et al [22], and the effect of divalent and trivalent cations on swelling behaviors of the poly[sodium acrylate-co-3-dimethyl (methacryloyloxyethyl) ammonium propane sulfonate] system [24].…”

Effect of N-(2-Aminoethyl)-3-Aminopropyltrimethoxysilane on the Adhesion of the Modified Silicone Tie-Coating to Epoxy Primer

“…Among the current low-surface antifouling coatings, silicone antifouling coating-based PDMS have been widely used due to the advantages of non-toxicity, low cost, an excellent antifouling effect and other advantages [7][8][9][10], but there are still some shortcomings involved in application [6]. For example, silicone antifouling coatings are often used in conjunction with epoxy primer due to epoxy primer having excellent mechanical, electrical, and bonding properties [11][12][13][14]. However, the interlaminar bonding strength between the silicone antifouling coatings and the epoxy primer were poor due to the surface properties of silicone such as low chemical reactivity and low surface energy [15][16][17][18].…”

Theoretical investigation of the effect of NP‐10 concentration on the swelling behavior of AA‐NaAA/NP hydrogel

“…On the basis of Eq. 2, the swelling ratio of the SAP can be quantitatively confirmed by the ion strength of the hydrophilic group, crosslinking density, polymer network behavior, the polymer networks elasticity, solvent kind, and the ion strength of external solution as well as the external solution characteristics, etc [19][20][21][22][23][24][25]. However, either the effects of the soluble polymers in the SAP without washing or the surfactant concentration on swelling ratio were not described by Eq.…”