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-Weinsäure?

L-Weinsäure ist eine chemische Verbindung, registriert unter der CAS-Nummer 87-69-4. Summenformel: C4H6O6. Molmasse: 150.09 g/mol. IUPAC: (2R,3R)-2,3-dihydroxybutanedioic acid.

Wie lautet die CAS-Nummer von L-Weinsäure?

Die CAS-Nummer von L-Weinsäure ist 87-69-4 — eine eindeutige Kennung des Chemical Abstracts Service (CAS).

Wie lautet die Summenformel von L-Weinsäure?

Summenformel: C4H6O6. Molmasse: 150.09 g/mol. logP (XLogP3): -1.9. PSA: 115 Å².

Wo kann ich L-Weinsäure kaufen?

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

Woher stammen die chemischen Daten für L-Weinsäure?

Die chemischen Daten für L-Weinsäure stammen aus zuverlässigen Quellen: PubChem (NIH). PubChem CID: 444305. Konform mit der CLP-Verordnung (EG 1272/2008), verfügbar unter der Lizenz CC-BY 4.0.

L-Weinsäure

L-Tartaric acid

CAS 87-69-4 · C₄H₆O₆ · MW 150.09 g/mol

Über L-Weinsäure

L-Weinsäure ist eine chemische Verbindung, registriert unter der Nummer CAS 87-69-4, mit der Summenformel C₄H₆O₆, und einer Molmasse von 150.09 g/mol.

Das Molekül enthält 16 Atome, verbunden durch 15 chemische Bindungen. Der vollständige systematische IUPAC-Name dieser Verbindung lautet (2R,3R)-2,3-dihydroxybutanedioic 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 = -1.9 (negativer Wert, hydrophile Verbindung), polare Oberfläche PSA = 115 Å², 4 Donatoren und 6 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	C₄H₆O₆
Masa molowa	150.09 g/mol
IUPAC	(2R,3R)-2,3-dihydroxybutanedioic acid
SMILES	`[C@@H]([C@H](C(=O)O)O)(C(=O)O)O`
InChIKey	`FEWJPZIEWOKRBE-JCYAYHJZSA-N`
logP (XLogP3)	-1.9
PSA	115 Å²
HBD / HBA	4 / 6
PubChem CID	CID 444305 ↗

GHS-Sicherheit

Sygnał: Niebezpieczeństwo

GHS05

GHS07

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.

Study of the diastereoisomers formed between (N-alkyl)-pipecolic acid-anilides and 2R,3R-tartaric acid or O,O′-dibenzoyl-2R,3R-tartaric acid. Do the tartaric acids form molecular-complexes, instead of salts during optical resolutions?

Katalin Nemák, Mária Acs, Zsuzsa M. Jászay et al. (1996) · Tetrahedron

Cytowania: 32$ PaywallDOI ↗

Optical resolution of racemic alcohols by diastereoisomeric complex formation with O,O′-dibenzoyl-(2R,3R)-tartaric acid; the crystal structure of the (–)-(1R,2S,5R)-menthol·O,O′-dibenzoyl-(2R,3R)-tartaric acid complex

Dávid Kozma, Zsolt Böcskei, Csaba Kassai et al. (1996) · Chem. Commun.

Cytowania: 12$ PaywallDOI ↗

SYNTHESIS OF (2R,3R) 0,0-DIPIVALOYLTARTARIC ACID (<i>DPTA</i>) AND OF (2R,3R) 0,0-DI(ADAMANTANE-1 CARBONYL) TARTARIC ACID (<i>DATA</i>), USEFUL CHIRAL REAGENTS FOR ASYMMETRIC PROTONATIONS

L. Duhamel, J. C. Plaquevent (1982) · Organic Preparations and Procedures International

Cytowania: 9$ PaywallDOI ↗

ChemInform Abstract: SYNTHESIS OF (2R,3R)‐O,O‐DIPIVALOYLTARTARIC ACID (DPTA) AND OF (2R,3R)‐O,O‐BIS(ADAMANTANE‐1‐CARBONYL)TARTARIC ACID (DATA), USEFUL CHIRAL REAGENTS FOR ASYMMETRIC PROTONATIONS

L. DUHAMEL, J. C. PLAQUEVENT (1983) · Chemischer Informationsdienst

$ PaywallDOI ↗

ChemInform Abstract: Study of the Diastereoisomers Formed Between (N‐Alkyl)‐pipecolic Acid Anilides and 2R,3R‐Tartaric Acid of O,O′‐Dibenzoyl‐2R,3R‐tartaric Acid. Do the Tartaric Acid Form Molecular Complexes Instead of Salts During Optical Resolutions?

K. NEMAK, M. ACS, Z. M. JASZAY et al. (1996) · 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-tartaric acid · 87-69-4 · L-(+)-Tartaric acid · L(+)-Tartaric acid · tartaric acid · (2R,3R)-2,3-dihydroxysuccinic acid · (2R,3R)-2,3-dihydroxybutanedioic acid · (+)-Tartaric acid · (+)-L-Tartaric acid · (R,R)-Tartaric acid · Threaric acid · Dextrotartaric acid · L-threaric acid · Natural tartaric acid · (+)-(R,R)-Tartaric acid

Datenquellen

📊 PubChem CID 444305 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

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