Does BMA mean n-butyl methacrylate or isobutyl methacrylate?

In most commercial usage the bare abbreviation means the normal isomer, n-butyl methacrylate, CAS 97-88-1. The branched isomer, isobutyl methacrylate, is a different substance with its own identifiers and a different contribution to copolymer hardness, and the tertiary isomer is different again. Because all three are abbreviated loosely in day-to-day correspondence, an order written as BMA alone is ambiguous. Write the full chemical name and the CAS number on every enquiry, purchase order and goods-inwards record.

Why must the monomer not be blanketed with pure nitrogen?

Because the stabiliser used in commercial methacrylate monomers requires dissolved oxygen to function. It intercepts radicals by a mechanism that consumes oxygen, so a drum stripped of oxygen contains an inhibitor that is chemically present and functionally absent. The correct headspace is air, or air diluted with nitrogen to a specified oxygen content, never an inert blanket. This is one of the very few cases in a chemical store where displacing oxygen makes a material more dangerous rather than less, and it catches people whose instinct is trained on flammable solvents.

How should inhibitor content be read on a certificate?

As a starting condition rather than a permanent property. The certificate reports the inhibitor level at release; that level falls in storage as the stabiliser does its job, and it falls faster in warm conditions, in light and in the presence of contamination. A long-stored drum can meet its original certificate on every other line while having very little inhibitor left. Where storage has been long or uncertain, retest the inhibitor level before charging a reactor rather than relying on the release figure.

What is popcorn polymerisation and why does it matter here?

It is a self-propagating, expanding polymer growth that forms in dead legs, vapour spaces, valve bonnets and residues where inhibitor cannot reach. Once seeded it continues under conditions that would not start a normal polymerisation, and it grows mechanically enough to jam valves and distort equipment. The controls are housekeeping controls: no unswept dead legs, no long-standing residues, no lines left full between campaigns, and clean vessels before refilling. It is not a reason to avoid methacrylate monomers, but it is a reason to design the pipework as if the monomer were reactive, because it is.

How does the butyl ester change a copolymer compared with the methyl one?

The four-carbon ester side chain is flexible and bulky, so it loosens chain packing and lowers the temperature at which the polymer softens. Against the methyl ester it gives a softer, more flexible and more extensible polymer, better adhesion and easier film formation, at the cost of hardness and block resistance. Against the corresponding acrylate it gives a harder polymer with the weathering advantage of the methacrylate backbone. Formulators use it as the soft component of an all-methacrylate system, which keeps the durability while tuning flexibility.

Was ist L-Aspartic acid?

L-Aspartic acid ist eine chemische Verbindung, registriert unter der CAS-Nummer 56-84-8. Summenformel: C4H7NO4. Molmasse: 133.10 g/mol. IUPAC: (2S)-2-aminobutanedioic acid.

Wie lautet die CAS-Nummer von L-Aspartic acid?

Die CAS-Nummer von L-Aspartic acid ist 56-84-8 — eine eindeutige Kennung des Chemical Abstracts Service (CAS).

Wie lautet die Summenformel von L-Aspartic acid?

Summenformel: C4H7NO4. Molmasse: 133.10 g/mol. logP (XLogP3): -2.8. PSA: 101 Å².

Wo kann ich L-Aspartic acid kaufen?

L-Aspartic acid ist in unserem Shop erhältlich. Produkt ansehen: https://epchems.online/products/l-aspartic-acid/

Woher stammen die chemischen Daten für L-Aspartic acid?

Die chemischen Daten für L-Aspartic acid stammen aus zuverlässigen Quellen: PubChem (NIH), ChEMBL (EBI). PubChem CID: 5960. Konform mit der CLP-Verordnung (EG 1272/2008), verfügbar unter der Lizenz CC-BY 4.0.

L-Aspartic acid

CAS 56-84-8 · C₄H₇NO₄ · MW 133.10 g/mol

Über L-Aspartic acid

L-Aspartic acid ist eine chemische Verbindung, registriert unter der Nummer CAS 56-84-8, mit der Summenformel C₄H₇NO₄, und einer Molmasse von 133.10 g/mol.

Das Molekül enthält 16 Atome, verbunden durch 15 chemische Bindungen. Der vollständige systematische IUPAC-Name dieser Verbindung lautet (2S)-2-aminobutanedioic acid. Das interaktive 3D-Modell oben zeigt die räumliche Anordnung der Atome — Sie können es mit der Maus drehen, mit dem Scrollrad zoomen und zwischen den Darstellungsmodi Skelett / Ball & Stick / Space Fill wechseln.

Hinsichtlich der physikalisch-chemischen Eigenschaften der Verteilungskoeffizient logP = -2.8 (negativer Wert, hydrophile Verbindung), polare Oberfläche PSA = 101 Å², 3 Donatoren und 5 Wasserstoffbrücken-Akzeptoren. Diese Parameter sind entscheidend für die Beurteilung der Bioverfügbarkeit und der Wechselwirkung mit Biomolekülen.

Die chemischen Daten für diese Verbindung stammen aus PubChem (NIH NLM NCBI), einer der größten chemischen Datenbanken der Welt. Alle Informationen werden automatisch aktualisiert und um GHS-Gefahrenhinweise gemäß der CLP-Verordnung (EG 1272/2008) ergänzt. Das obige Widget darf für Bildungs-, Forschungs- und kommerzielle Zwecke verwendet werden.

Physikalisch-chemische Eigenschaften

Wzór sumaryczny	C₄H₇NO₄
Masa molowa	133.10 g/mol
IUPAC	(2S)-2-aminobutanedioic acid
SMILES	`C([C@@H](C(=O)O)N)C(=O)O`
InChIKey	`CKLJMWTZIZZHCS-REOHCLBHSA-N`
logP (XLogP3)	-2.8
PSA	101 Å²
HBD / HBA	3 / 5
PubChem CID	CID 5960 ↗

Wissenschaftliche Literatur

Literatura naukowa

5 artykułów · 0 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

📈 Timeline publikacji (5 artykułów)

Wysokość słupka = liczba artykułów w roku. Hover dla szczegółów.

Determination of Precipitation Limit of Zn(II) Ion with (2S)-2-Aminobutanedioic Acid

Fatmir Faiku, Haxhere Faiku, Arben Haziri et al. (2009) · American Journal of Biochemistry and Biotechnology

$ PaywallDOI ↗

Incorporation of (2S,3S) and (2S,3R) β-Methyl aspartic acid into RGD-Containing peptides

S Schabbert (2002) · Bioorganic & Medicinal Chemistry

Cytowania: 22$ PaywallDOI ↗

Synthesis of (2S)-4,4-difluoroproline, (2S,4R)-4-fluoroproline and their derivatives from (S)-aspartic acid

Fehn, Susanna, Klaus Burger, Rudolph, Martin et al. (1994) · Elsevier

Cytowania: 14$ PaywallDOI ↗

Primary deuterium isotope effects for the 3-methylaspartase-catalyzed deamination of (2S)-aspartic acid (2S,3S)-3-methylaspartic acid, and (2S,3S)-3-ethylaspartic acid

Nigel P. Botting, Mark A. Cohen, Mahmoud Akhtar et al. (1988) · Biochemistry

Cytowania: 10$ PaywallDOI ↗

ChemInform Abstract: Synthesis of 2S,3aS,7aS‐ and of 2S,3aR,7aR‐Perhydroindole‐2‐carboxylic Acid Derivatives from L‐Aspartic Acid.

D. H. R. BARTON, J. GUILHEM, Y. HERVE et al. (1987) · ChemInform

$ PaywallDOI ↗

Dane z PubMed (NIH NLM), OpenAlex (CC0), Semantic Scholar (AI2). AI Summary wygenerowane przez Semantic Scholar TLDR. Artykuły z ikoną wymagają płatnego dostępu.

Synonyme

L-aspartic acid · aspartic acid · 56-84-8 · (2S)-2-aminobutanedioic acid · Asparagic acid · L-Aminosuccinic acid · (S)-2-Aminosuccinic acid · Asparaginic acid · L-Asparaginic acid · L-Asparagic acid · (S)-Aspartic acid · Aspartic acid, L- · (S)-Aminobutanedioic acid · L-Asparaginsaeure · Acidum asparticum

Datenquellen

📊 PubChem CID 5960 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

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