Investigation of nanostructure and properties of aromatic-aliphatic polyamide-based nanocomposites with clay additives

2009 ◽  
Vol 112 (5) ◽  
pp. 3141-3148 ◽  
Author(s):  
Sonia Zulfiqar ◽  
Saima Shabbir ◽  
Muhammad Ishaq ◽  
Muhammad Ilyas Sarwar
Keyword(s):  
Aliphatic Polyamide

Synthesis of all-aliphatic polyamide dendrimers based on a 3,3′-diaminopivalic acid scaffold

2015 ◽  
Vol 6 (16) ◽  
pp. 3031-3038 ◽  
Author(s):  
Antonio Jesus Ruiz-Sanchez ◽  
Pablo Mesa-Antunez ◽  
Nekane Barbero ◽  
Daniel Collado ◽  
Yolanda Vida ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Building Blocks ◽  
Aliphatic Polyamide

Iterative 3,3′-diaminopivalic acid connections act as building blocks in the production of new all-aliphatic polyamide dendrimers. 3,3′-Diazidopivalic acid units underpin a two-step pathway involving carboxylic acid–amine condensation, followed azide reduction.

scholarly journals Analysis of Dendrimer Generation by Sombor Indices

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Shahid Amin ◽  
Abaid Ur Rehman Virk ◽  
M.A. Rehman ◽  
Nehad Ali Shah
Keyword(s):  
Drug Delivery ◽  
Pharmaceutical Industry ◽  
Dendritic Structure ◽  
Nanometer Scale ◽  
Surface Groups ◽  
Functional Surface ◽  
Exterior Surface ◽  
Phosphorus Containing ◽  
Wet Lab ◽  
Aliphatic Polyamide

Dendrimers are highly branched, star-shaped macromolecules with nanometer-scale dimensions. Dendrimers are defined by three components: a central core, an interior dendritic structure (the branches), and an exterior surface with functional surface groups. Topological indices are numerical numbers that help us to understand the topology of different dendrimers and can be used to predict the properties without performing experiments in the wet lab. In the present paper, we computed the Sombor index and the reduced version of the Sombor index for the molecular graphs of phosphorus-containing dendrimers, porphyrin-cored dendrimers, PDI-cored dendrimers, triazine-based dendrimers, and aliphatic polyamide dendrimers. We also plotted our results by using Maple 2015 which help us to see the dependence of the Sombor index and reduced Sombor index on the involved parameters. Our results may help to develop better understanding about phosphorus-containing dendrimers, porphyrin-cored dendrimers, PDI-cored dendrimers, triazine-based dendrimers, and aliphatic polyamide dendrimers. Our results are also useful in the pharmaceutical industry and drug delivery.

scholarly journals New Aspects on the Direct Solid State Polycondensation (DSSP) of Aliphatic Nylon Salts: The Case of Hexamethylene Diammonium Dodecanoate

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2625
Author(s):  
Angeliki D. Mytara ◽  
Athanasios D. Porfyris ◽  
Stamatina N. Vouyiouka ◽  
Constantine D. Papaspyrides
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Critical Parameter ◽  
Critical Parameters ◽  
Reaction Conditions ◽  
Solid State Polymerization ◽  
Salt Crystals ◽  
Direct Solid ◽  
End Group ◽  
Aliphatic Polyamide

The direct solid state polymerization (DSSP) of hexamethylene diammonium dodecanoate (PA 612 salt) was investigated for two different salt grades, fossil-based and bio-based. Aliphatic polyamide salts (such as PA 612 salt) are highly susceptible to solid melt transition (SMT) phenomena, which restrain the industrial application of DSSP. To that end, emphasis was given on reactor design, being the critical parameter influencing byproduct diffusion, amine loss and inherent DSSP kinetics. Experiments took place both at the microscale and the laboratory scale, in which two different reactors were tested in terms of bypassing SMT phenomena. The new reactor designed here proved quite successful in maintaining the solid state during the reaction. Scouting experiments were conducted in order to assess the effect of critical parameters and determine appropriate reaction conditions. Fossil-based PA 612 products proved to have a better end-group imbalance in comparison to bio-based ones, which is critical in terms of achieving high molecular weight. Finally, a real DSSP process was demonstrated, starting from PA 612 salt crystals and ending with PA 612 particles.

Porous membranes from an aliphatic polyamide

Polimery ◽  
1995 ◽  
Vol 40 (05) ◽  
pp. 278-284 ◽  
Author(s):  
MICHAL BODZEK ◽  
IRENA KORUS
Keyword(s):  
Porous Membranes ◽  
Aliphatic Polyamide
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