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 Acido citrico monoidrato?

Acido citrico monoidrato è un composto chimico registrato con il numero CAS 5949-29-1. Formula bruta: C₆H₁₀O₈. Massa molare: 210.14 g/mol. IUPAC: 2-hydroxypropane-1,2,3-tricarboxylic acid;hydrate.

Qual è il numero CAS di Acido citrico monoidrato?

Il numero CAS di Acido citrico monoidrato è 5949-29-1 — un identificativo univoco del Chemical Abstracts Service (CAS).

Qual è la formula bruta di Acido citrico monoidrato?

Formula bruta: C₆H₁₀O₈. Massa molare: 210.14 g/mol. PSA: 133 Å².

Quali sono i pericoli GHS di Acido citrico monoidrato?

Secondo la classificazione GHS, Acido citrico monoidrato deve riportare le seguenti indicazioni di pericolo: H319 (Provoca grave irritazione oculare.), H315 (Provoca irritazione cutanea.), H335 (Può irritare le vie respiratorie.).

Dove acquistare Acido citrico monoidrato?

Acido citrico monoidrato è disponibile nel nostro negozio. Vedi il prodotto: https://epchems.online/products/citric-acid-monohydrate/

Da dove provengono i dati chimici di Acido citrico monoidrato?

I dati chimici di Acido citrico monoidrato provengono da fonti autorevoli: PubChem (NIH), ChEMBL (EBI). PubChem CID: 22230. Conformi al Regolamento CLP (CE 1272/2008), disponibili con licenza CC-BY 4.0.

Acido citrico monoidrato

2-Hydroxy-1,2,3-propanetricarboxylic acid hydrate (1:1)

CAS 5949-29-1 · C₆H₁₀O₈ · MW 210.14 g/mol

Informazioni su Acido citrico monoidrato

Acido citrico monoidrato è un composto chimico registrato con il numero CAS 5949-29-1, con formula bruta C₆H₁₀O₈, e massa molare di 210.14 g/mol.

La molecola contiene 24 atomi collegati da 22 legami chimici. Il nome sistematico IUPAC completo di questo composto è 2-hydroxypropane-1,2,3-tricarboxylic acid;hydrate. 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, superficie polare PSA = 133 Å², 5 donatori e 8 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	C₆H₁₀O₈
Masa molowa	210.14 g/mol
IUPAC	2-hydroxypropane-1,2,3-tricarboxylic acid;hydrate
SMILES	`C(C(=O)O)C(CC(=O)O)(C(=O)O)O.O`
InChIKey	`YASYEJJMZJALEJ-UHFFFAOYSA-N`
logP (XLogP3)	—
PSA	133 Å²
HBD / HBA	5 / 8
PubChem CID	CID 22230 ↗

Sicurezza GHS

Sygnał: Uwaga

GHS07

H319 — Działa drażniąco na oczy

H315 — Działa drażniąco na skórę

H335 — Może powodować podrażnienie dróg oddechowych

Letteratura scientifica

Literatura naukowa

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

Citric Acid, Anhydrous, and Citric Acid, Monohydrate.

(2017)

$ PaywallDOI ↗PDF ↗

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

Sinonimi

Citric acid monohydrate · 5949-29-1 · Citric acid hydrate · CITRIC ACID, MONOHYDRATE · 1,2,3-Propanetricarboxylic acid, 2-hydroxy-, monohydrate · citric acid;hydrate · 2968PHW8QP · 1,2,3-Propanetricarboxylic acid, 2-hydroxy-, hydrate (1:1) · Acidum citricum monohydrate · Citiric acid · Soothe Chewable · Surface Wipes · Stop Hair · Alphacide Activator · PURILAB

Fonti dei dati

📊 PubChem CID 22230 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

Acquista nel negozio

Citric Acid Monohydrate →

Molecole correlate

Propylene Glycol CAS 57-55-6 · C3H8O2 Polyvinyl Alcohol (PVA) CAS 9002-89-5 Dodecylbenzenesulphonic Acid CAS 27176-87-0 · C₁₈H₃₀O₃S Sodium hydroxide CAS 1310-73-2 · HNaO L-Phenylalanine CAS 63-91-2 · C9H11NO2 Diethylene glycol monobutyl ether CAS 112-34-5 · C8H18O3