| 词条 | Sodium polyaspartate |
| 释义 |
| ImageFile = Sodium polyaspartate.png | ImageSize = 240px | ImageAlt = | IUPACName = polyaspartic acid sodium salt | OtherNames = |Section1={{Chembox Identifiers | CASNo = 94525-01-6 | CASNo_Comment = (for (α,β)-DL-polysodiumaspartate) | PubChem = | SMILES = }} |Section2={{Chembox Properties | Formula = (C4H4NNaO3)n | MolarMass =variable | Appearance = | Density = | MeltingPt = | BoilingPt = | Solubility = }} |Section3={{Chembox Hazards | NFPA-H = 0 | NFPA-F = 0 | NFPA-R = 0 | MainHazards = | FlashPt = | AutoignitionPt = }} }} Sodium polyaspartate is a sodium salt of polyaspartic acid. It is biodegradable condensation polymer based on the amino acid aspartic acid. PolymerizationThe polymerization reaction is an example of a step-growth polymerization to a polyamide and in one practical procedure[1] aspartic acid is simply heated to 180 °C resulting in water release and the formation of a poly(succinimide). In the subsequent step, this polymer is reacted with sodium hydroxide in water, which hydrolyzes one of the two amide bonds of the succinimide ring to form a sodium carboxylate. The remaining amide bond is thus the linkage between successive aspartate units. Each aspartate unit is identified as α or β according to which carbonyl of it is part of the polymer chain. The α form has one carbon in the backbone in addition to the carbonyl itself (and a two-carbon sidechain) whereas the β form has two carbons in the backbone in addition to the carbonyl itself (and a one-carbon sidechain). This reaction gives a sodium poly(aspartate) copolymer composed of approximately 30% α-linkages and 70% β-linkages. UsesThis material can be synthesized in an environmentally friendly way and is biodegradeable, thus it is a green alternative to several materials such as sodium polyacrylate used in disposable diapers and agriculture.[2][3] In addition and due to its water-solubility and ability to chelate metal ions, polyaspartate is used as a biodegradeable anti-scaling agent and a corrosion inhibitor.[4][5] See alsoPolyaspartic acidReferences1. ^{{cite journal |title= A Green Polymerization of Aspartic Acid for the Undergraduate Organic Laboratory |journal= J. Chem. Educ. |year= 2005 |volume= 82 |issue= 9 |pages= 1380–1381 |url= http://jchemed.chem.wisc.edu/Journal/Issues/2005/Sep/abs1380.html |format= Abstract |author= Bennett GD |doi= 10.1021/ed082p1380|bibcode = 2005JChEd..82.1380B }} {{biochem-stub}}2. ^{{Cite journal| last1 = Gross | first1 = R. A. | last2 = Kalra | first2 = B. | year = 2002 | title = Biodegradable Polymers for the Environment | journal = Science | volume = 297 | issue = 5582 | pages = 803–807 | doi = 10.1126/science.297.5582.803 | url = http://www.sciencemag.org/cgi/content/abstract/297/5582/803 | pmid = 12161646 | bibcode=2002Sci...297..803G}} 3. ^{{cite web |url= http://www.epa.gov/greenchemistry/pubs/pgcc/winners/sba96.html |title= Presidential Green Chemistry Challenge Awards: 1996 Small Business Award: Donlar Corporation (now NanoChem Solutions, Inc.): Production and Use of Thermal Polyaspartic Acid |publisher= US Environmental Protection Agency}} 4. ^{{Cite book|title= Commercial poly(aspartic acid) and Its Uses |last = Low | first = K. C. |author2=Wheeler, A. P. |author3=Koskan, L. P. |series= Advances in Chemistry Series |volume= 248 |publisher= American Chemical Society |location= Washington, D.C. |year= 1996}} 5. ^{{Cite journal| last1 = Thombre | first1 = S.M. | last2 = Sarwade | first2 = B.D. | year = 2005 | title = Synthesis and Biodegradability of Polyaspartic Acid: A Critical Review | journal = Journal of Macromolecular Science, Part A | volume = 42 | issue = 9 | pages = 1299–1315 | url = http://www.informaworld.com/index/718581646.pdf | doi = 10.1080/10601320500189604}} 3 : Polyamides|Polyelectrolytes|Chelating agents |
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