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.

Qu'est-ce que Hydroxyde de sodium ?

Hydroxyde de sodium est un composé chimique enregistré sous le numéro CAS 1310-73-2. Formule brute: HNaO. Masse molaire: 40.00 g/mol.

Quel est le numéro CAS de Hydroxyde de sodium ?

Le numéro CAS de Hydroxyde de sodium est 1310-73-2 — un identifiant unique du Chemical Abstracts Service (CAS).

Quelle est la formule brute de Hydroxyde de sodium ?

Formule brute: HNaO. Masse molaire: 40.00 g/mol. logP (XLogP3): 0.

Quels sont les dangers GHS de Hydroxyde de sodium ?

Selon la classification GHS, Hydroxyde de sodium doit porter les mentions de danger suivantes : H314 (Provoque des brûlures de la peau et des lésions oculaires graves.).

Où acheter Hydroxyde de sodium ?

Hydroxyde de sodium est disponible dans notre boutique. Voir le produit : https://epchems.online/products/sodium-hydroxide/

D'où proviennent les données chimiques de Hydroxyde de sodium ?

Les données chimiques de Hydroxyde de sodium proviennent de sources faisant autorité : PubChem (NIH). PubChem CID: 14798. Conformes au règlement CLP (CE 1272/2008), disponibles sous licence CC-BY 4.0.

Hydroxyde de sodium

Wodorotlenek sodu

CAS 1310-73-2 · HNaO · MW 40.00 g/mol

À propos de Hydroxyde de sodium

Hydroxyde de sodium est un composé chimique enregistré sous le numéro CAS 1310-73-2, de formule brute HNaO, et de masse molaire 40.00 g/mol.

La molécule contient 3 atomes reliés par 1 liaisons chimiques. Le modèle 3D interactif ci-dessus permet de visualiser l'arrangement spatial des atomes — vous pouvez le faire pivoter à la souris, zoomer avec la molette et basculer entre les modes de visualisation squelette / Ball & Stick / Space Fill.

Du point de vue des propriétés physico-chimiques, le coefficient de partage logP = 0 (valeur négative, composé hydrophile). Ces paramètres sont essentiels pour évaluer la biodisponibilité et l'interaction avec les biomolécules.

Les données chimiques de ce composé proviennent de PubChem (NIH NLM NCBI), l'une des plus grandes bases de données chimiques au monde. Toutes les informations sont mises à jour automatiquement et enrichies de traductions des mentions de danger GHS conformes au règlement CLP (CE 1272/2008). Le widget ci-dessus peut être utilisé à des fins éducatives, de recherche et commerciales.

Propriétés physico-chimiques

Wzór sumaryczny	HNaO
Masa molowa	40.00 g/mol
IUPAC	—
SMILES	`[Na+].[OH-]`
InChIKey	—
logP (XLogP3)	0
PSA	—
HBD / HBA	—
PubChem CID	CID 14798 ↗

Sécurité GHS

Sygnał: Niebezpieczeństwo

GHS05

H314 — Powoduje poważne oparzenia skóry oraz uszkodzenia oczu

Littérature scientifique

Literatura naukowa

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

🔓

NIOSH skin notation (SK) profile: sodium hydroxide (NaOH) [CAS No. 1310-73-2].

(2011)

Open AccessDOI ↗PDF ↗

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

Sources des données

📊 PubChem CID 14798 — NIH
🔬 NIST WebBook — spektroskopia
💊 ChEMBL — bioaktywność

Acheter en boutique

Sodium hydroxide →

Molécules apparentées

Diethylene glycol butylether acetate CAS 124-17-4 · C10H20O4 Ethylene glycol diacetate CAS 111-55-7 · C6H10O4 Butyl glycol CAS 111-76-2 · C6H14O2 Glycerol CAS 56-81-5 · C3H8O3 Tert-Butanol CAS 75-65-0 · C4H10O Sorbitol CAS 50-70-4 · C6H14O6