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-Aspartic acid?

L-Aspartic acid è un composto chimico registrato con il numero CAS 56-84-8. Formula bruta: C4H7NO4. Massa molare: 133.10 g/mol. IUPAC: (2S)-2-aminobutanedioic acid.

Qual è il numero CAS di L-Aspartic acid?

Il numero CAS di L-Aspartic acid è 56-84-8 — un identificativo univoco del Chemical Abstracts Service (CAS).

Qual è la formula bruta di L-Aspartic acid?

Formula bruta: C4H7NO4. Massa molare: 133.10 g/mol. logP (XLogP3): -2.8. PSA: 101 Å².

Dove acquistare L-Aspartic acid?

L-Aspartic acid è disponibile nel nostro negozio. Vedi il prodotto: https://epchems.online/products/l-aspartic-acid/

Da dove provengono i dati chimici di L-Aspartic acid?

I dati chimici di L-Aspartic acid provengono da fonti autorevoli: PubChem (NIH), ChEMBL (EBI). PubChem CID: 5960. Conformi al Regolamento CLP (CE 1272/2008), disponibili con licenza CC-BY 4.0.

L-Aspartic acid

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

Informazioni su L-Aspartic acid

L-Aspartic acid è un composto chimico registrato con il numero CAS 56-84-8, con formula bruta C₄H₇NO₄, e massa molare di 133.10 g/mol.

La molecola contiene 16 atomi collegati da 15 legami chimici. Il nome sistematico IUPAC completo di questo composto è (2S)-2-aminobutanedioic 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 = -2.8 (valore negativo, composto idrofilo), superficie polare PSA = 101 Å², 3 donatori e 5 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	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 ↗

Letteratura scientifica

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.

Sinonimi

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

Fonti dei dati

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

Acquista nel negozio

L-Aspartic acid →

Molecole correlate

Sodium bicarbonate CAS 144-55-8 · CHNaO3 Propyl Acetate CAS 109-60-4 · C5H10O2 Propylene carbonate CAS 108-32-7 · C4H6O3 Butyl glycol CAS 111-76-2 · C6H14O2 Butyl acetate (BTAC) CAS 123-86-4 · C6H12O2 Phosphotungstic acid CAS 12067-99-1 · W12PHO39·H2O