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 L-mentolo?

L-mentolo è un composto chimico registrato con il numero CAS 2216-51-5. Formula bruta: C10H20O. Massa molare: 156.26 g/mol. IUPAC: (1R,2S,5R)-5-methyl-2-propan-2-ylcyclohexan-1-ol.

Qual è il numero CAS di L-mentolo?

Il numero CAS di L-mentolo è 2216-51-5 — un identificativo univoco del Chemical Abstracts Service (CAS).

Qual è la formula bruta di L-mentolo?

Formula bruta: C10H20O. Massa molare: 156.26 g/mol. logP (XLogP3): 3. PSA: 20.2 Å².

Quali sono i pericoli GHS di L-mentolo?

Secondo la classificazione GHS, L-mentolo deve riportare le seguenti indicazioni di pericolo: H315 (Provoca irritazione cutanea.), H320 (Provoca irritazione oculare.), H336 (Può provocare sonnolenza o vertigini.), H402 (Działa szkodliwie na organizmy wodne).

Dove acquistare L-mentolo?

L-mentolo è disponibile nel nostro negozio. Vedi il prodotto: https://epchems.online/products/l-menthol/

Da dove provengono i dati chimici di L-mentolo?

I dati chimici di L-mentolo provengono da fonti autorevoli: PubChem (NIH), ChEMBL (EBI). PubChem CID: 16666. Conformi al Regolamento CLP (CE 1272/2008), disponibili con licenza CC-BY 4.0.

L-mentolo

(-)-Menthol

CAS 2216-51-5 · C₁₀H₂₀O · MW 156.26 g/mol

Informazioni su L-mentolo

L-mentolo è un composto chimico registrato con il numero CAS 2216-51-5, con formula bruta C₁₀H₂₀O, e massa molare di 156.26 g/mol.

La molecola contiene 31 atomi collegati da 31 legami chimici. Il nome sistematico IUPAC completo di questo composto è (1R,2S,5R)-5-methyl-2-propan-2-ylcyclohexan-1-ol. 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 = 3 (valore positivo, composto lipofilo), superficie polare PSA = 20.2 Å², 1 donatori e 1 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	C₁₀H₂₀O
Masa molowa	156.26 g/mol
IUPAC	(1R,2S,5R)-5-methyl-2-propan-2-ylcyclohexan-1-ol
SMILES	`C[C@@H]1CC[C@H]([C@@H](C1)O)C(C)C`
InChIKey	`NOOLISFMXDJSKH-KXUCPTDWSA-N`
logP (XLogP3)	3
PSA	20.2 Å²
HBD / HBA	1 / 1
PubChem CID	CID 16666 ↗

Sicurezza GHS

Sygnał: Uwaga

GHS07

H315 — Działa drażniąco na skórę

H320 — H320

H336 — Może wywoływać uczucie senności lub zawroty głowy

H402 — Działa szkodliwie na organizmy wodne

Letteratura scientifica

Literatura naukowa

2 artykułów · 1 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

🔓

Nematicidal activity of menthol and its dithiophosphoric derivatives

Georgiy Shumatbaev, Anastasia Egorova, Alsu Gatiyatullina et al. (2021) · EDP Sciences

Open AccessDOI ↗PDF ↗

Nematicidal activity of menthol and its dithiophosphoric derivatives

Gatiyatullina A., Shumatbaev G., Nikitin E. et al. (2021)

$ Paywall

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-Menthol · (-)-menthol · 2216-51-5 · Levomenthol · l-(-)-Menthol · (-)-Menthyl alcohol · Levomentholum · U.S.P. Menthol · (1R)-(-)-Menthol · (-)-(1R,3R,4S)-Menthol · D-(-)-Menthol · (-)-trans-p-Menthan-cis-ol · levomentol · (1R,2S,5R)-5-methyl-2-(propan-2-yl)cyclohexan-1-ol · Menthol, (1R,3R,4S)-(-)-

Fonti dei dati

📊 PubChem CID 16666 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

Acquista nel negozio

L-Menthol →

Molecole correlate

Butyl acetate (BTAC) CAS 123-86-4 · C6H12O2 Trichloroethylene CAS 127-18-4 · C2Cl4 Benzoic acid CAS 65-85-0 · C7H6O2 Sodium persulfate CAS 7775-27-1 · Na₂O₈S₂ 1-Propanol (n-Propanol) CAS 71-23-8 · C3H8O Iron oxide black CAS 12227-89-3 · Fe₃O₄