scholarly journals Synthesis and characterization of a biodegradable polyaspartic acid/2-amino-2-methyl-1-propanol graft copolymer and evaluation of its scale and corrosion inhibition performance

RSC Advances ◽  
2017 ◽  
Vol 7 (58) ◽  
pp. 36714-36721 ◽  
Author(s):  
Shuchen Shi ◽  
Yufeng Wu ◽  
Yueyan Wang ◽  
Jing Yu ◽  
Ying Xu
Keyword(s):  
Corrosion Inhibition ◽  
Acid Derivative ◽  
Graft Copolymer ◽  
Ring Opening ◽  
Synthesis And Characterization ◽  
Polyaspartic Acid ◽  
Ring Opening Reaction ◽  
Inhibition Performance

Herein, a novel polyaspartic acid derivative, polyaspartic acid/2-amino-2-methyl-1-propanol graft copolymer (PASP/AMP), was synthesized via a ring-opening reaction using polysuccinimide (PSI) and 2-amino-2-methyl-1-propanol (AMP).

Synthesis of polyaspartic acid–aminobenzenesulfonic acid grafted copolymer and its scale inhibition performance and dispersion capacity

2011 ◽  
Vol 64 (2) ◽  
pp. 423-430 ◽  
Author(s):  
Ying Xu ◽  
Lina Wang ◽  
Linlin Zhao ◽  
Yuanchen Cui
Keyword(s):  
Corrosion Inhibition ◽  
Graft Copolymer ◽  
Polyaspartic Acid ◽  
Copolymer Solution ◽  
Sulfonic Group ◽  
Grafted Copolymer ◽  
Scale Inhibition ◽  
Dispersion Capacity ◽  
Inhibition Performance ◽  
Inhibition Ability

Polysuccinimide (abridged as PSI) was synthesized by urea and maleic anhydride. Aminobenzenesulfonic acid (ABSA) was introduced at different mole ratio to PSI to generate polyaspartic acid (abridged as PASP)/ABSA graft copolymer. The scale inhibition behavior of resultant PASP/ABSA copolymer was evaluated by using static scale inhibition method. The transmittance of the supernatant of the copolymer solution was measured to evaluate its dispersion ability for ferric oxide. The corrosion inhibition performance of the copolymer for iron plates immersed in the refined testing water (including 0.555 g of CaCl2·2H2O, 0.493 g of MgSO4·7H2O, 50 mg PASP/ABSA graft copolymer and 0.168 g of NaCl) was tested. It was found that PASP/ABSA copolymer was able to efficiently inhibit CaCO3 and Ca3(PO4)2 scales and had good corrosion inhibition ability as well, and it also had good dispersion ability for Fe2O3. Besides, the inhibition efficiency of PASP/ABSA against CaCO3 and Ca3(PO4)2 scales and its dispersion capacity for Fe2O3 was highly dependent on dosage. The reason may lie in that PASP/ABSA copolymer simultaneously possesses carboxylic ion and sulfonic group which can chelate Ca2+ to form stabilized and dissoluble chelates, resulting in increase of solubility of calcium salts in water. Also it may lie in that the introduction of acidic hydrophilic sulfonic group with a strong electrolytic capacity into PASP molecule simultaneously enhances the dispersion of the inhibitor molecules and hinders the formation of Ca3(PO4)2 scale.

Synthesis and Characterization of Photocurable Biodegradable Elastomers

2014 ◽  
Vol 665 ◽  
pp. 359-362
Author(s):  
Fang Yuan Guo ◽  
Xia Shen ◽  
Xiao Hong Pei ◽  
Gen Sheng Yang
Keyword(s):  
1H Nmr ◽  
Ring Opening ◽  
Degradation Rate ◽  
Synthesis And Characterization ◽  
Protein Drugs ◽  
Optimal Conditions ◽  
Cross Link ◽  
Ring Opening Reaction ◽  
The Cross

The aim of this study was to synthesize a serious of biodegradable elastomers by photocurable reaction as a potential biomaterial for the delivery of protein drugs. The macromonomers was prepared via ring opening reaction at 140°C later methacrylic acylated at 50°C. The optimal conditions were investigated and the property of the two macromonomer precursors were characterized via GPC and 1H-NMR. The cross-link degree of the elastomers can be adjusted by changing the concentration of photoinitiator (DMPA), furthermore influence the elastomers’ degradation rate. it could provide more appropriate choice for the elastomers in application.

Synthesis and Characterization of Palm Oil Based Polyol

2013 ◽  
Vol 812 ◽  
pp. 275-280
Author(s):  
Yahaya Siti Munira ◽  
Ahmad Faiza Mohd ◽  
Mohamed Rahmah
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Palm Oil ◽  
Ring Opening ◽  
Hydroxyl Group ◽  
Synthesis And Characterization ◽  
Epoxidized Palm Oil ◽  
Ring Opening Reaction ◽  
Epoxy Groups

In this study, palm oil-based polyols were prepared and characterized. In order to prepare the polyol, Epoxidized palm oil (EPO) was reacted with glycerol and undergoes ring opening reaction. The synthesized oil was characterized by oxygen oxirane content titration (OOC), hydroxyl value test (HV), fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR). Based on the FTIR spectrum of polyols, the disappearance of epoxy groups at 825cm-1, 843cm-1 and the emergence of hydroxyl group at 3394cm-1 are obvious indicating that hydroxyl group of the polyols formed. In NMR, the presence of new signal at δ 3.46ppm (-CH-OH) showed the attachment of hydroxyl group onto the epoxidized palm oil.

Synthesis and Characterization of Poly(Lactic Acid)-Grafted Natural Rubber by Reactive Melt-Blending Technique

2018 ◽  
Vol 382 ◽  
pp. 7-11
Author(s):  
Yodsathorn Wongngam ◽  
Cattaleeya Pattamaprom
Keyword(s):  
Lactic Acid ◽  
Natural Rubber ◽  
Ring Opening ◽  
Degree Of Polymerization ◽  
Hydroxyl Group ◽  
Synthesis And Characterization ◽  
Poly Lactic Acid ◽  
Esterification Reaction ◽  
Ring Opening Reaction

This study investigated the synthesis and characterization of poly(lactic acid)-grafted natural rubber (PLA-g-NR) in molten state. The grafting was carried out in an internal mixer without and with the presence of tin octoate catalyst (TO). The grafting of lactide onto NR was carried out by using maleic anhydride (MA) as a linker. The FTIR and 1H-NMR spectra revealed new peaks for the MA-grafted NR (NR-g-MA) and PLA indicating that MA was grafted onto NR and that LA was successfully polymerized into PLA. It was also found that MA grafted onto NR could assist as a linker for connecting PLA with NR via esterification reaction between hydroxyl group (OH) at the end chain of PLA and carboxylic group (COOH) from ring opening reaction of MA. Moreover, the decrease of residual LA peak in FTIR spectra suggested that the presence of TO catalyst in the reactive blend promoted higher degree of polymerization of PLA from ring opening reaction of LA.

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