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 L-Alanine ?

L-Alanine est un composé chimique enregistré sous le numéro CAS 56-41-7. Formule brute: C3H7NO2. Masse molaire: 89.09 g/mol. IUPAC: (2S)-2-aminopropanoic acid.

Quel est le numéro CAS de L-Alanine ?

Le numéro CAS de L-Alanine est 56-41-7 — un identifiant unique du Chemical Abstracts Service (CAS).

Quelle est la formule brute de L-Alanine ?

Formule brute: C3H7NO2. Masse molaire: 89.09 g/mol. logP (XLogP3): -3. PSA: 63.3 Å².

Où acheter L-Alanine ?

L-Alanine est disponible dans notre boutique. Voir le produit : https://epchems.online/products/l-alanine/

D'où proviennent les données chimiques de L-Alanine ?

Les données chimiques de L-Alanine proviennent de sources faisant autorité : PubChem (NIH), ChEMBL (EBI). PubChem CID: 5950. Conformes au règlement CLP (CE 1272/2008), disponibles sous licence CC-BY 4.0.

L-Alanine

CAS 56-41-7 · C₃H₇NO₂ · MW 89.09 g/mol

À propos de L-Alanine

L-Alanine est un composé chimique enregistré sous le numéro CAS 56-41-7, de formule brute C₃H₇NO₂, et de masse molaire 89.09 g/mol.

La molécule contient 13 atomes reliés par 12 liaisons chimiques. Le nom systématique IUPAC complet de ce composé est (2S)-2-aminopropanoic acid. 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 = -3 (valeur négative, composé hydrophile), surface polaire PSA = 63.3 Å², 2 donneurs et 3 accepteurs de liaisons hydrogène. 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	C₃H₇NO₂
Masa molowa	89.09 g/mol
IUPAC	(2S)-2-aminopropanoic acid
SMILES	`C[C@@H](C(=O)O)N`
InChIKey	`QNAYBMKLOCPYGJ-REOHCLBHSA-N`
logP (XLogP3)	-3
PSA	63.3 Å²
HBD / HBA	2 / 3
PubChem CID	CID 5950 ↗

Littérature scientifique

Literatura naukowa

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

📈 Timeline publikacji (4 artykułów)

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

3-Selanyl-2-Aminopropanoic Acid

(2015) · Encyclopedia of Astrobiology

$ PaywallDOI ↗

3-Selanyl-2-Aminopropanoic Acid

(2011) · Encyclopedia of Astrobiology

$ PaywallDOI ↗

$13-Selanyl-2-aminopropanoic Acid

(2023) · Encyclopedia of Astrobiology

$ PaywallDOI ↗

3-Selanyl-2-aminopropanoic Acid

(2013) · Encyclopedia of Systems Biology

$ PaywallDOI ↗

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

Synonymes

L-alanine · 56-41-7 · alanine · (S)-Alanine · (2S)-2-Aminopropanoic acid · L-alpha-alanine · (S)-2-Aminopropanoic acid · L-2-Aminopropionic acid · 2-Aminopropionic acid · L-(+)-Alanine · L-2-Aminopropanoic acid · L-alpha-Aminopropionic acid · (L)-Alanine · alpha-Aminopropionic acid · alanina

Sources des données

📊 PubChem CID 5950 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

Acheter en boutique

L-Alanine →

Molécules apparentées

Propylene Glycol CAS 57-55-6 · C3H8O2 Iron oxide red CAS 1309-37-1 · Fe₂O₃ Diethyl carbonate CAS 105-58-8 · C5H10O3 L-Serine CAS 56-45-1 · C3H7NO3 Sodium Nitrate CAS 7631-99-4 · NaNO₃ Trichloroethylene CAS 79-01-6 · C2HCl3