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.

L-Valine ist eine chemische Verbindung, registriert unter der CAS-Nummer 72-18-4. Summenformel: C5H11NO2. Molmasse: 117.15 g/mol. IUPAC: (2S)-2-amino-3-methylbutanoic acid.

Wie lautet die CAS-Nummer von L-Valine?

Die CAS-Nummer von L-Valine ist 72-18-4 — eine eindeutige Kennung des Chemical Abstracts Service (CAS).

Wie lautet die Summenformel von L-Valine?

Summenformel: C5H11NO2. Molmasse: 117.15 g/mol. logP (XLogP3): -2.3. PSA: 63.3 Å².

Wo kann ich L-Valine kaufen?

L-Valine ist in unserem Shop erhältlich. Produkt ansehen: https://epchems.online/products/l-valine/

Woher stammen die chemischen Daten für L-Valine?

Die chemischen Daten für L-Valine stammen aus zuverlässigen Quellen: PubChem (NIH), ChEMBL (EBI). PubChem CID: 6287. Konform mit der CLP-Verordnung (EG 1272/2008), verfügbar unter der Lizenz CC-BY 4.0.

L-Valine

CAS 72-18-4 · C₅H₁₁NO₂ · MW 117.15 g/mol

Über L-Valine

L-Valine ist eine chemische Verbindung, registriert unter der Nummer CAS 72-18-4, mit der Summenformel C₅H₁₁NO₂, und einer Molmasse von 117.15 g/mol.

Das Molekül enthält 19 Atome, verbunden durch 18 chemische Bindungen. Der vollständige systematische IUPAC-Name dieser Verbindung lautet (2S)-2-amino-3-methylbutanoic acid. Das interaktive 3D-Modell oben zeigt die räumliche Anordnung der Atome — Sie können es mit der Maus drehen, mit dem Scrollrad zoomen und zwischen den Darstellungsmodi Skelett / Ball & Stick / Space Fill wechseln.

Hinsichtlich der physikalisch-chemischen Eigenschaften der Verteilungskoeffizient logP = -2.3 (negativer Wert, hydrophile Verbindung), polare Oberfläche PSA = 63.3 Å², 2 Donatoren und 3 Wasserstoffbrücken-Akzeptoren. Diese Parameter sind entscheidend für die Beurteilung der Bioverfügbarkeit und der Wechselwirkung mit Biomolekülen.

Die chemischen Daten für diese Verbindung stammen aus PubChem (NIH NLM NCBI), einer der größten chemischen Datenbanken der Welt. Alle Informationen werden automatisch aktualisiert und um GHS-Gefahrenhinweise gemäß der CLP-Verordnung (EG 1272/2008) ergänzt. Das obige Widget darf für Bildungs-, Forschungs- und kommerzielle Zwecke verwendet werden.

Physikalisch-chemische Eigenschaften

Wzór sumaryczny	C₅H₁₁NO₂
Masa molowa	117.15 g/mol
IUPAC	(2S)-2-amino-3-methylbutanoic acid
SMILES	`CC(C)[C@@H](C(=O)O)N`
InChIKey	`KZSNJWFQEVHDMF-BYPYZUCNSA-N`
logP (XLogP3)	-2.3
PSA	63.3 Å²
HBD / HBA	2 / 3
PubChem CID	CID 6287 ↗

Wissenschaftliche Literatur

Literatura naukowa

10 artykułów · 2 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

📈 Timeline publikacji (10 artykułów)

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

Thermodynamic Study of Some Amino Acids, 2-Aminopropanoic Acid, 2-Amino-3-methylbutanoic Acid, 2-Amino-4-methylpentanoic Acid, and 2-Amino-3-phenylpropanoic Acid in Aqueous Saccharide Solutions at Different Temperatures: Volumetric and Ultrasonic Study

Amalendu Pal, Nalin Chauhan (2011) · Journal of Chemical & Engineering Data

Cytowania: 41$ PaywallDOI ↗

Volumetric and Conductometric Behavior at T = 298.15 K of 2-[(2-Aminoacetyl)amino]acetic Acid, 2-[(2-Aminoacetyl)amino]-3-methylbutanoic Acid, and (2S)-2-[(2-Aminoacetyl)amino]-4-methylpentanoic Acid with Sodium Hexanoate

Zhenning Yan, Yang Zhao, Ronghua Xing et al. (2009) · Journal of Chemical & Engineering Data

Cytowania: 13$ PaywallDOI ↗

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(S,S)-2-(((Hydroxynaphth-1-yl)(4′-nitrophenyl)methyl)amino)-3-methylbutanoic Acid Methyl Ester

Maria Annunziata M. Capozzi, Cosimo Cardellicchio (2022) · Molbank

Cytowania: 3Open AccessDOI ↗PDF ↗

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SimpleDesign: A Joint Model for Protein Sequence and Structure Codesign

Jiarui Lu, Yuyang Wang, Yizhe Zhang et al. (2026) · arXiv (2609.03377v1)

Open AccessPDF ↗

( R )‐2‐Amino‐3‐mercapto‐3‐methylbutanoic Acid

Boheng Guan, Xuyu Liu (2026) · Encyclopedia of Reagents for Organic Synthesis

$ PaywallDOI ↗

2,4-Diamino-3-methylbutanoic acid, a novel amino acid in root nodule hydrolysates from Lotus tenuis

G.John Shaw, P.J. Ellingham, L.N. Nixon (1981) · Phytochemistry

Cytowania: 9$ PaywallDOI ↗

Coupling of [[922|ethyl (2S)‐2‐[(2S)‐2‐amino‐3‐phenylpropanamido]‐3‐phenylpropanoate trifluoroacetate salt]] with 2-naphthoxyacetic acid

Bart Dietrich (2020) · ChemSpider Synthetic Pages

$ PaywallDOI ↗

Diffusion coefficient of DL-2-amino-3-methylbutanoic acid in water

Jochen Winkelmann (2018) · Diffusion in Gases, Liquids and Electrolytes

$ PaywallDOI ↗

Crystal structure of leukotriene A4 hydrolase in complex with (2S)-2-amino-5-[[4-[(2S)-2-hydroxy-2-phenyl-ethoxy]phenyl]amino]-5-oxo-pentanoic acid

M.M.G.M. Thunnissen, M. Adler, M. Whitlow (2008) · Worldwide Protein Data Bank

$ PaywallDOI ↗

Crystal structure of ERAP2 aminopeptidase in complex with phosphinic pseudotripeptide((1R)-1-Amino-3-phenylpropyl){(2S)-3-[((2S)-1-amino-1-oxo-3-phenylpropan-2-yl)amino]-2-{[3-(2-hydroxyphenyl)-isoxazol-5-yl]methyl}-3-oxopropyl}phosphinic acid

P. Giastas, E. Stratikos, A. Mpakali (2022)

$ PaywallDOI ↗

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

Synonyme

L-valine · valine · 72-18-4 · (S)-Valine · (2S)-2-amino-3-methylbutanoic acid · (S)-2-Amino-3-methylbutanoic acid · 2-Amino-3-methylbutyric acid · (S)-2-Amino-3-methylbutyric acid · valina · L-alpha-Amino-beta-methylbutyric acid · L-valin · Valinum · (S)-alpha-Amino-beta-methylbutyric acid · NSC-76038 · l-(+)-alpha-Aminoisovaleric acid

Datenquellen

📊 PubChem CID 6287 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

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