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-Aspartic acid ?

L-Aspartic acid est un composé chimique enregistré sous le numéro CAS 56-84-8. Formule brute: C4H7NO4. Masse molaire: 133.10 g/mol. IUPAC: (2S)-2-aminobutanedioic acid.

Quel est le numéro CAS de L-Aspartic acid ?

Le numéro CAS de L-Aspartic acid est 56-84-8 — un identifiant unique du Chemical Abstracts Service (CAS).

Quelle est la formule brute de L-Aspartic acid ?

Formule brute: C4H7NO4. Masse molaire: 133.10 g/mol. logP (XLogP3): -2.8. PSA: 101 Å².

Où acheter L-Aspartic acid ?

L-Aspartic acid est disponible dans notre boutique. Voir le produit : https://epchems.online/products/l-aspartic-acid/

D'où proviennent les données chimiques de L-Aspartic acid ?

Les données chimiques de L-Aspartic acid proviennent de sources faisant autorité : PubChem (NIH), ChEMBL (EBI). PubChem CID: 5960. Conformes au règlement CLP (CE 1272/2008), disponibles sous licence CC-BY 4.0.

L-Aspartic acid

CAS 56-84-8 · C₄H₇NO₄ · MW 133.10 g/mol

À propos de L-Aspartic acid

L-Aspartic acid est un composé chimique enregistré sous le numéro CAS 56-84-8, de formule brute C₄H₇NO₄, et de masse molaire 133.10 g/mol.

La molécule contient 16 atomes reliés par 15 liaisons chimiques. Le nom systématique IUPAC complet de ce composé est (2S)-2-aminobutanedioic 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 = -2.8 (valeur négative, composé hydrophile), surface polaire PSA = 101 Å², 3 donneurs et 5 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	C₄H₇NO₄
Masa molowa	133.10 g/mol
IUPAC	(2S)-2-aminobutanedioic acid
SMILES	`C([C@@H](C(=O)O)N)C(=O)O`
InChIKey	`CKLJMWTZIZZHCS-REOHCLBHSA-N`
logP (XLogP3)	-2.8
PSA	101 Å²
HBD / HBA	3 / 5
PubChem CID	CID 5960 ↗

Littérature scientifique

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.

Determination of Precipitation Limit of Zn(II) Ion with (2S)-2-Aminobutanedioic Acid

Fatmir Faiku, Haxhere Faiku, Arben Haziri et al. (2009) · American Journal of Biochemistry and Biotechnology

$ PaywallDOI ↗

Incorporation of (2S,3S) and (2S,3R) β-Methyl aspartic acid into RGD-Containing peptides

S Schabbert (2002) · Bioorganic & Medicinal Chemistry

Cytowania: 22$ PaywallDOI ↗

Synthesis of (2S)-4,4-difluoroproline, (2S,4R)-4-fluoroproline and their derivatives from (S)-aspartic acid

Fehn, Susanna, Klaus Burger, Rudolph, Martin et al. (1994) · Elsevier

Cytowania: 14$ PaywallDOI ↗

Primary deuterium isotope effects for the 3-methylaspartase-catalyzed deamination of (2S)-aspartic acid (2S,3S)-3-methylaspartic acid, and (2S,3S)-3-ethylaspartic acid

Nigel P. Botting, Mark A. Cohen, Mahmoud Akhtar et al. (1988) · Biochemistry

Cytowania: 10$ PaywallDOI ↗

ChemInform Abstract: Synthesis of 2S,3aS,7aS‐ and of 2S,3aR,7aR‐Perhydroindole‐2‐carboxylic Acid Derivatives from L‐Aspartic Acid.

D. H. R. BARTON, J. GUILHEM, Y. HERVE et al. (1987) · 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.

Synonymes

L-aspartic acid · aspartic acid · 56-84-8 · (2S)-2-aminobutanedioic acid · Asparagic acid · L-Aminosuccinic acid · (S)-2-Aminosuccinic acid · Asparaginic acid · L-Asparaginic acid · L-Asparagic acid · (S)-Aspartic acid · Aspartic acid, L- · (S)-Aminobutanedioic acid · L-Asparaginsaeure · Acidum asparticum

Sources des données

📊 PubChem CID 5960 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

Acheter en boutique

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