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-Alanine?

L-Alanine è un composto chimico registrato con il numero CAS 56-41-7. Formula bruta: C3H7NO2. Massa molare: 89.09 g/mol. IUPAC: (2S)-2-aminopropanoic acid.

Qual è il numero CAS di L-Alanine?

Il numero CAS di L-Alanine è 56-41-7 — un identificativo univoco del Chemical Abstracts Service (CAS).

Qual è la formula bruta di L-Alanine?

Formula bruta: C3H7NO2. Massa molare: 89.09 g/mol. logP (XLogP3): -3. PSA: 63.3 Å².

Dove acquistare L-Alanine?

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

Da dove provengono i dati chimici di L-Alanine?

I dati chimici di L-Alanine provengono da fonti autorevoli: PubChem (NIH), ChEMBL (EBI). PubChem CID: 5950. Conformi al Regolamento CLP (CE 1272/2008), disponibili con licenza CC-BY 4.0.

L-Alanine

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

Informazioni su L-Alanine

L-Alanine è un composto chimico registrato con il numero CAS 56-41-7, con formula bruta C₃H₇NO₂, e massa molare di 89.09 g/mol.

La molecola contiene 13 atomi collegati da 12 legami chimici. Il nome sistematico IUPAC completo di questo composto è (2S)-2-aminopropanoic 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 = -3 (valore negativo, composto idrofilo), superficie polare PSA = 63.3 Å², 2 donatori e 3 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	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 ↗

Letteratura scientifica

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.

Sinonimi

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

Fonti dei dati

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

Acquista nel negozio

L-Alanine →

Molecole correlate

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