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.

Che cos'è Acido L-tartarico?

Acido L-tartarico è un composto chimico registrato con il numero CAS 87-69-4. Formula bruta: C4H6O6. Massa molare: 150.09 g/mol. IUPAC: (2R,3R)-2,3-dihydroxybutanedioic acid.

Qual è il numero CAS di Acido L-tartarico?

Il numero CAS di Acido L-tartarico è 87-69-4 — un identificativo univoco del Chemical Abstracts Service (CAS).

Qual è la formula bruta di Acido L-tartarico?

Formula bruta: C4H6O6. Massa molare: 150.09 g/mol. logP (XLogP3): -1.9. PSA: 115 Å².

Dove acquistare Acido L-tartarico?

Acido L-tartarico è disponibile nel nostro negozio. Vedi il prodotto: https://epchems.online/products/l-tartaric-acid/

Da dove provengono i dati chimici di Acido L-tartarico?

I dati chimici di Acido L-tartarico provengono da fonti autorevoli: PubChem (NIH). PubChem CID: 444305. Conformi al Regolamento CLP (CE 1272/2008), disponibili con licenza CC-BY 4.0.

Acido L-tartarico

L-Tartaric acid

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

Informazioni su Acido L-tartarico

Acido L-tartarico è un composto chimico registrato con il numero CAS 87-69-4, con formula bruta C₄H₆O₆, e massa molare di 150.09 g/mol.

La molecola contiene 16 atomi collegati da 15 legami chimici. Il nome sistematico IUPAC completo di questo composto è (2R,3R)-2,3-dihydroxybutanedioic acid. Il modello 3D interattivo qui sopra permette di visualizzare la disposizione spaziale degli atomi — puoi ruotarlo con il mouse, zoomare con la rotellina e passare tra le modalità di visualizzazione scheletro / Ball & Stick / Space Fill.

Dal punto di vista delle proprietà chimico-fisiche, il coefficiente di ripartizione logP = -1.9 (valore negativo, composto idrofilo), superficie polare PSA = 115 Å², 4 donatori e 6 accettori di legami a idrogeno. Questi parametri sono fondamentali per valutare la biodisponibilità e l'interazione con le biomolecole.

I dati chimici di questo composto provengono da PubChem (NIH NLM NCBI), uno dei più grandi database chimici al mondo. Tutte le informazioni sono aggiornate automaticamente e arricchite con le traduzioni delle indicazioni di pericolo GHS conformi al Regolamento CLP (CE 1272/2008). Il widget qui sopra può essere utilizzato per scopi educativi, di ricerca e commerciali.

Proprietà chimico-fisiche

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 ↗

Sicurezza GHS

Sygnał: Niebezpieczeństwo

GHS05

GHS07

Letteratura scientifica

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.

Sinonimi

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

Fonti dei dati

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

Acquista nel negozio

L (+)-Tartaric acid →

Molecole correlate

Cyclohexanone CAS 108-94-1 · C6H10O Trichloroethylene CAS 79-01-6 · C2HCl3 Methylene Chloride CAS 75-09-2 · CH₂Cl₂ Propyl Acetate CAS 109-60-4 · C5H10O2 L-Cystine CAS 30925-07-6 · C6H14Cl2N2O4S2 Diethylene glycol butylether acetate CAS 124-17-4 · C10H20O4