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.

Glycerol è un composto chimico registrato con il numero CAS 56-81-5. Formula bruta: C3H8O3. Massa molare: 92.09 g/mol. IUPAC: propane-1,2,3-triol.

Qual è il numero CAS di Glycerol?

Il numero CAS di Glycerol è 56-81-5 — un identificativo univoco del Chemical Abstracts Service (CAS).

Qual è la formula bruta di Glycerol?

Formula bruta: C3H8O3. Massa molare: 92.09 g/mol. logP (XLogP3): -1.8. PSA: 60.7 Å².

Dove acquistare Glycerol?

Glycerol è disponibile nel nostro negozio. Vedi il prodotto: https://epchems.online/products/glycerol/

Da dove provengono i dati chimici di Glycerol?

I dati chimici di Glycerol provengono da fonti autorevoli: PubChem (NIH), ChEMBL (EBI). PubChem CID: 753. Conformi al Regolamento CLP (CE 1272/2008), disponibili con licenza CC-BY 4.0.

Glycerol

CAS 56-81-5 · C₃H₈O₃ · MW 92.09 g/mol

Informazioni su Glycerol

Glycerol è un composto chimico registrato con il numero CAS 56-81-5, con formula bruta C₃H₈O₃, e massa molare di 92.09 g/mol.

La molecola contiene 14 atomi collegati da 13 legami chimici. Il nome sistematico IUPAC completo di questo composto è propane-1,2,3-triol. 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 = -1.8 (valore negativo, composto idrofilo), superficie polare PSA = 60.7 Å², 3 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	C₃H₈O₃
Masa molowa	92.09 g/mol
IUPAC	propane-1,2,3-triol
SMILES	`C(C(CO)O)O`
InChIKey	`PEDCQBHIVMGVHV-UHFFFAOYSA-N`
logP (XLogP3)	-1.8
PSA	60.7 Å²
HBD / HBA	3 / 3
PubChem CID	CID 753 ↗

Letteratura scientifica

Literatura naukowa

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

🔓

Re‐evaluation of glycerol (E 422) as a food additive

EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS), Alicja Mortensen, Fernando Aguilar et al. (2017) · EFSA Journal

Cytowania: 38Open AccessDOI ↗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

glycerol · glycerin · 56-81-5 · Glycerine · 1,2,3-Propanetriol · Glycyl alcohol · Trihydroxypropane · Glyceritol · Osmoglyn · 1,2,3-trihydroxypropane · Glyrol · Glysanin · Grocolene · Ophthalgan · Glycerinum

Fonti dei dati

📊 PubChem CID 753 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

Acquista nel negozio

Glycerol →

Molecole correlate

Acetone CAS 67-64-1 · C3H6O Diethylene glycol CAS 111-46-6 · C4H10O3 Dipropylene glycol dimethyl ether CAS 111109-77-4 · C8H18O3 Ethylene glycol diacetate CAS 111-55-7 · C6H10O4 Sodium carbonate CAS 497-19-8 · CNa₂O₃ Citric acid monohydrate CAS 77-92-9 · C6H8O7