Effect of organoclay modifier structure on the viscoelastic and thermal properties of poly(methyl methacrylate)/organoclay nanocomposites

Abstract

The review highlights the main results of two decades of research on climacostol (5-[(2Z)non-2-en-1-yl]benzene-1,3-diol), the resorcinolic lipid produced and used by the ciliated protozoan Climacostomum virens for chemical defense against a wide range of predators, and to assist its carnivorous feeding. After the first studies on the physiological function of climacostol, the compound and some analogues were chemically synthesized, thus allowing us to explore both its effect on different prokaryotic and eukaryotic biological systems, and the role of its relevant structural traits. In particular, the results obtained in the last 10 years indicate climacostol is an effective antimicrobial and anticancer agent, bringing new clues to the attempt to design and synthesize additional novel analogues that can increase or optimize its pharmacological properties.

Superior optical and dielectric properties of ultrasonic-assisted solution-cast prepared PMMA/MMT nanocomposite films

“…A lowering in T g indicates that the PMMA amount which exists outside the MMT galleries as revealed from their XRD results have an increase in chain dynamics due to the plasticizing effect of MMT on the PMMA phase [29] implying that the electrostatic interactions make the PMMA material more flexible and dynamic when interacted with exfoliated MMT nanoplatelets as compared to its dynamics in pristine PMMA matrix. In contrast to exfoliated MMT, the MMT intercalated structures create hindrance to the chain segmental motion of polymer which increased the T g values of nanocomposites as reported in the literature [16,[18][19][20]. The decrease in the T g was also reported for various other PNC materials based on the PMMA matrix [15,30].…”

“…In addition to 3D nanofillers, the one-dimensional (1D) MMT nanofiller containing PMMA/MMT nanocomposites have been an intense area of research for the academics and scientific interest to understand the concepts of nanocomposites, and also promoting their industrial applications [13][14][15][16][17][18][19][20]. Most of these studies focused on the chemical synthesis route of PMMA/MMT intercalated hybrid preparation including in situ polymerization, and also by melt blending and solution-cast (SC) methods.…”

Nanocomposites made from thermoplastic linear poly(urethane-siloxane) and organoclay: Composition impact on the properties

“…The effect of mineral clay, a thermal insulator and mass transport barrier, on thermal stability can be increased by improving the dispersibility of the organoclay mineral. 8,24 The derivative TG analysis (DTG) was used to study the thermal degradation mechanism of TPU NCs (Fig. 3b).…”

“…[4][5][6][7] It was established that for good dispersion of clay platelets into polymer matrix, clays have to be modified with some hydrophobic surfactants, since clay platelets are hydrophilic and incompatible with a relatively hydrophobic polymer matrix. 8 Clay is usually modified by exchanging the interlayer inorganic cations with organic long-chain cations like alkylammonium ions, which enables more favourable interactions with the desired, usually hydrophobic, matrix. 9 According to the literature, [10][11][12] intercalated or exfoliated structure, partially exfoliated or mixed exfoliated-intercalated structure, could be achieved depending on the preparation method and in correlation to strength of interfacial interactions between the polymer matrix and organoclays.…”

Preparation of PMMA‐Based Temperature/pH Responsive Nanoparticles Encapsulating 5‐Fluorouracil and Methotrexate In Situ by One‐Pot Dispersion Photopolymerization

“…[23,24] It is generally accepted that PMMA is a non-toxic polymer owing to its good toxicological safety record in biomedical applications. To date, conventional preparation methods of PMMA involve suspension polymerization, [25] emulsion polymerization, [26] and dispersion polymerization, [27] and most of them are based on thermal initiation, which inevitably causes energy waste and environmental pollution. [28,29] To avoid these, researchers have paid more attention to photopolymerization initiated under visible light LED recently.…”