Synthesis and orientation study of a magnetically aligned liquid-crystalline chitin/poly(acrylic acid) composite

2003 ◽  
Vol 41 (7) ◽  
pp. 711-714 ◽  
Author(s):  
Thi Thi Nge ◽  
Naruhito Hori ◽  
Akio Takemura ◽  
Hirokuni Ono ◽  
Tsunehisa Kimura
Keyword(s):  
Acrylic Acid ◽  
Liquid Crystalline ◽  
Orientation Study ◽  
Magnetically Aligned ◽  
Poly Acrylic Acid

Synthesis and FTIR spectroscopic studies on shear induced oriented liquid crystalline chitin/poly(acrylic acid) composite

2003 ◽  
Vol 90 (7) ◽  
pp. 1932-1940 ◽  
Author(s):  
Thi Thi Nge ◽  
Naruhito Hori ◽  
Akio Takemura ◽  
Hirokuni Ono ◽  
Tsunehisa Kimura
Keyword(s):  
Acrylic Acid ◽  
Liquid Crystalline ◽  
Spectroscopic Studies ◽  
Poly Acrylic Acid

scholarly journals Thermal analysis studies on the compatibility of furosemide with solid state and liquid crystalline excipients

2020 ◽  
Vol 74 (1) ◽  
pp. 15-23
Author(s):  
Marilena Vlachou ◽  
Natassa Pippa ◽  
Angeliki Siamidi ◽  
Aimilia Kyrili
Keyword(s):  
Solid State ◽  
Acrylic Acid ◽  
Thermal Behavior ◽  
Liquid Crystalline ◽  
Pharmaceutical Formulations ◽  
Magnesium Stearate ◽  
Molar Ratio ◽  
Scanning Calorimetry ◽  
Poly Ethylene ◽  
Poly Acrylic Acid

In the context of the present study, the thermal behavior of furosemide and the solid state excipients, sodium alginate, poly(ethylene oxide), poly(vinylpyrrolidone), lactose mono-hydrate and magnesium stearate, using Differential Scanning Calorimetry (DSC), was probed. It was found that the thermal behavior of these solid-state pharmaceutical excipients and furosemide correlates nicely with the literature relevant data. Regarding the furosemide-excipients mixtures, the DSC scans appear as a compilation of the thermal curves of each excipient. This suggests that the formulations containing these mixtures, may retain their stability over time. This information, which arises from the cooperativity of materials, their thermal stability and behavioris very helpful for the research and development of safe and effective pharmaceutical formulations. DSC experiments were also carried out with chimeric bilayers (called ?liposomes?), composed of hydrogenated soy phosphatidylcholine (HSPC) and poly(n-butylacrylate)-b-poly(acrylic acid) block copolymer with 70 % content of poly(acrylic acid (PnBA-b-PAA 30/70) with the addition of furosemide at the molar ratio of 9:0.1:1.0 in the system HSPC:PnBA-b-PAA 30/70:furosemide. Chimeric liposomal systems were characterized as ?fluid-like? by their DSC curves, which may be potentially translated as an easy way for release of furosemide from the advanced delivery system.

Soft ionic liquid based resistive memory characteristics in a two terminal discrete polydimethylsiloxane cylindrical microchannel

2020 ◽  
Vol 8 (38) ◽  
pp. 13368-13374
Author(s):  
Muhammad Umair Khan ◽  
Gul Hassan ◽  
Jinho Bae
Keyword(s):  
Ionic Liquid ◽  
Acrylic Acid ◽  
Sodium Hydroxide ◽  
Sodium Salt ◽  
Resistive Memory ◽  
Cylindrical Microchannel ◽  
Memory Characteristics ◽  
Poly Acrylic Acid

This paper proposes a novel soft ionic liquid (IL) electrically functional device that displays resistive memory characteristics using poly(acrylic acid) partial sodium salt (PAA-Na+:H2O) solution gel and sodium hydroxide (NaOH) in a thin polydimethylsiloxane (PDMS) cylindrical microchannel.

Reactions of macroions with ester and carboxylic groups of polymers

1987 ◽  
Vol 52 (9) ◽  
pp. 2194-2203
Author(s):  
Miloslav Kučera ◽  
Dušan Kimmer ◽  
Karla Majerová ◽  
Josef Majer
Keyword(s):  
Maleic Anhydride ◽  
Acrylic Acid ◽  
Methyl Methacrylate ◽  
Bond Formation ◽  
Covalent Bond ◽  
The Other ◽  
Poly Methyl Methacrylate ◽  
Other Hand ◽  
Carboxylic Groups ◽  
Poly Acrylic Acid

In the reaction of dianions with poly(methyl methacrylate), only an insignificant amount of insoluble crosslinked product is obtained. If, however, the concentration of grafting dianions approaches that of ester groups, the amount of poly(methyl methacrylate) which may thus be crosslinked becomes quite significant. Dications, too, can bring about crosslinking of only an insignificant number of poly(methyl methacrylate) chains. Carboxylic groups in poly(acrylic acid) react with dianions and dications in an anhydrous medium similarly to ester groups. On the other hand, in the presence of a cocatalytic amount of water dications are more readily bound to carboxylic groups, forming a covalent bond. The relatively highest efficiency was observed in the bond formation between dication and the poly[styrene-alt-(maleic anhydride)], both in an anhydrous medium and in the presence of H2O.

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