Preparation and characterization of poly(amide‐imide)/Mg‐Al LDH nanocomposites; effect of organo‐modified LDH on thermal properties and morphology

Abstract

New poly(amide‐imide) Mg‐Al/layered double hydroxide (LDH) nanocomposites (PAINC) were prepared from synthesized poly(amide‐imide) (PAI) containing sulfone and ether linkages with two new organo modified Mg‐Al LDH (OLDH) by solution intercalation technique. OLDH were prepared from two different organo modifier with and without imide heterocyclic structure by one step method. The results of X‐ray diffraction (XRD), field emission‐scanning electron microscopy (FE‐SEM) and transmission electron microscopy (TEM) showed uniform distribution for LDH sheets in the PAI matrix. Thermal properties of all the samples were studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The thermal properties results showed that by OLDH loading in PAI matrix the thermal stabilities were increased. The temperature at 5% mass loss (T5) was increased from 225°C to 300°C for PAINC containing 5 mass% of OLDH containing imide hetrocyclic rings. The theoretical study indicated that the d‐value of OLDH has been related to structure of its organo‐modifier. POLYM. COMPOS., 39:E1669–E1681, 2018. © 2017 Society of Plastics Engineers

A Facile Synthesis of Core-Shell SiO2@Cu-LBMS Nano-Microspheres for Drug Sustained Release Systems

“…This will enhance several crucial properties of “free” drugs, such as improving their solubility, in vivo stability and specificity, and reducing or eliminating tissue damage [1]. During the past several years, many nanomaterials have been used in drug delivery systems, such as mesoporous silica (MS) [2,3,4], mesoporous magnesium carbonate (MMC) [5], highly porous amorphous calcium carbonates (HPACC) [6], polymeric nanoparticles [7], liposomes [8], carbon nanodots (CDs) [9] and brucite-like materials [10,11,12,13,14,15,16,17]. MS, MMC and HPACC are inorganic nanomaterials, and the mechanism of drug loading mainly depends on pore adsorption.…”

“…One is layered double hydroxides (LDHs) with a general formula of [M II 1−z M III z(OH) 2 ](A m− ) z/m ·nH 2 O, where M II is a divalent cation such as Mg 2+ , Fe 2+ , Ni 2+ , Zn 2+ , or Co 2+ ; M III is a trivalent cation such as Al 3+ , Cr 3+ , Fe 3+ , or Ga 3+ ; and A m− is an exchangeable anion such as CO 3 − , NO 3 − , OH − , X − , etc. The z is the molecular ratio of M 3+ /(M 2+ + M 3+ ), generally ranging between 0.2 and 0.4 [16,17,21,22,23,24,25,26]. LHDs with highly positive surface charge, low costs and large area have been demonstrated as good adsorbents to effectively remove acidic or negatively charged compounds and are a desirable carrier for drug or biomolecule delivery [27,28,29,30].…”

New nanocomposites based on polyamide containing imine groups reinforced with functionalized polyethyleneimine‐modified ZnO nanoparticles; fabrication, characterization and lead ion adsorption studies

“…Polymer nanocomposite materials exhibited the combination properties of the polymer matrix (such as flexibility and ductility) and inorganic nanofillers (such as high thermal stability, strength, hardness and high refractive index) [10][11][12][13][14][15]. They have also shown wide potential applications in various research fields such as plastics and rubber reinforcement [16,17], catalysis [18,19], coatings [20], lithography [21] electronics [22], biotechnology [23,24], and water purification [25,26].…”