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 Phthalic anhydride (MA)?

Phthalic anhydride (MA) è un composto chimico registrato con il numero CAS 85-44-9. Formula bruta: C8H4O3. Massa molare: 148.11 g/mol. IUPAC: 2-benzofuran-1,3-dione.

Qual è il numero CAS di Phthalic anhydride (MA)?

Il numero CAS di Phthalic anhydride (MA) è 85-44-9 — un identificativo univoco del Chemical Abstracts Service (CAS).

Qual è la formula bruta di Phthalic anhydride (MA)?

Formula bruta: C8H4O3. Massa molare: 148.11 g/mol. logP (XLogP3): 1.3. PSA: 43.4 Å².

Quali sono i pericoli GHS di Phthalic anhydride (MA)?

Secondo la classificazione GHS, Phthalic anhydride (MA) deve riportare le seguenti indicazioni di pericolo: H302 (Nocivo se ingerito.), H335 (Può irritare le vie respiratorie.), H315 (Provoca irritazione cutanea.), H318 (Provoca gravi lesioni oculari.), H334 (Può provocare sintomi allergici o asmatici o difficoltà respiratorie se inalato.).

Dove acquistare Phthalic anhydride (MA)?

Phthalic anhydride (MA) è disponibile nel nostro negozio. Vedi il prodotto: https://epchems.online/products/phthalic-anhydride/

Da dove provengono i dati chimici di Phthalic anhydride (MA)?

I dati chimici di Phthalic anhydride (MA) provengono da fonti autorevoli: PubChem (NIH), ChEMBL (EBI). PubChem CID: 6811. Conformi al Regolamento CLP (CE 1272/2008), disponibili con licenza CC-BY 4.0.

Phthalic anhydride (MA)

Phthalic Anhydride

CAS 85-44-9 · C₈H₄O₃ · MW 148.11 g/mol

Informazioni su Phthalic anhydride (MA)

Phthalic anhydride (MA) è un composto chimico registrato con il numero CAS 85-44-9, con formula bruta C₈H₄O₃, e massa molare di 148.11 g/mol.

La molecola contiene 15 atomi collegati da 16 legami chimici. Il nome sistematico IUPAC completo di questo composto è 2-benzofuran-1,3-dione. 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 = 1.3 (valore positivo, composto lipofilo), superficie polare PSA = 43.4 Å², 0 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	C₈H₄O₃
Masa molowa	148.11 g/mol
IUPAC	2-benzofuran-1,3-dione
SMILES	`C1=CC=C2C(=C1)C(=O)OC2=O`
InChIKey	`LGRFSURHDFAFJT-UHFFFAOYSA-N`
logP (XLogP3)	1.3
PSA	43.4 Å²
HBD / HBA	0 / 3
PubChem CID	CID 6811 ↗

Sicurezza GHS

Sygnał: Niebezpieczeństwo

GHS05

GHS07

H302 — Działa szkodliwie po połknięciu

H335 — Może powodować podrażnienie dróg oddechowych

H315 — Działa drażniąco na skórę

H318 — Powoduje poważne uszkodzenie oczu

H334 — Może powodować objawy alergii lub astmy lub trudności w oddychaniu w następstwie wdychania

H317 — Może powodować reakcję alergiczną skóry

Letteratura scientifica

Literatura naukowa

12 artykułów · 4 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

📈 Timeline publikacji (12 artykułów)

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

(Solid + Liquid) Equilibrium of (4-Chloro-2-benzofuran-1,3-dione + 5-Chloro-2-benzofuran-1,3-dione)

Hai-Zhe Ji, Xian-Chao Meng, Hong-Kun Zhao (2009) · Journal of Chemical & Engineering Data

Cytowania: 14$ PaywallDOI ↗

Solid–Liquid Equilibria of Ternary 4-Nitro-2-benzofuran-1,3-dione + 5-Nitro-2-benzofuran-1,3-dione + 2-Propanone at 283.15 K and 323.15 K

Rong-Rong Li, De-Man Han, Fu-You Pan et al. (2013) · Journal of Chemical & Engineering Data

Cytowania: 12$ PaywallDOI ↗

🔓

3,6-Dimethyl-o-phenylenedimethanol

Humaira Yasmeen Gondal, Muhammad Ali, Alain Krief et al. (2010) · Acta Crystallographica Section E

Open AccessDOI ↗PDF ↗

🔓

Phthalic anhydride: Illustrating a conundrum in chemical allergy.

Basketter DA, Kimber I (2016) · Journal of immunotoxicology

ReviewOpen AccessDOI ↗PubMed ↗PDF ↗

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Improved Anti-Inflammatory Effects of Liposomal Astaxanthin on a Phthalic Anhydride-Induced Atopic Dermatitis Model.

Lee YS, Jeon SH, Ham HJ et al. (2020) · Frontiers in immunology

Open AccessDOI ↗PubMed ↗PDF ↗

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Quantitative evaluation of the therapeutic effect of fermented soybean products containing a high concentration of GABA on phthalic anhydride-induced atopic dermatitis in IL-4/Luc/CNS-1 Tg mice.

Lee YJ, Kim JE, Kwak MH et al. (2014) · International journal of molecular medicine

Open AccessDOI ↗PubMed ↗PDF ↗

Anti-inflammatory effect of astaxanthin in phthalic anhydride-induced atopic dermatitis animal model.

Park JH, Yeo IJ, Han JH et al. (2018) · Experimental dermatology

$ PaywallDOI ↗PubMed ↗

Phthalic anhydride-induced occupational asthma.

Wernfors M, Nielsen J, Schütz A et al. (1986) · International archives of allergy and applied immunology

$ PaywallDOI ↗PubMed ↗

Anti-inflammatory effect of Centella asiatica phytosome in a mouse model of phthalic anhydride-induced atopic dermatitis.

Ju Ho P, Jun Sung J, Ki Cheon K et al. (2018) · Phytomedicine : international journal of phytotherapy and phytopharmacology

$ PaywallDOI ↗PubMed ↗

Contact urticaria to phthalic anhydride.

Gutiérrez-Fernández D, Fuentes-Vallejo MS, Rueda-Ygueravides MD et al. (2007) · Journal of investigational allergology & clinical immunology

$ PaywallPubMed ↗

Anti-inflammatory effect of bee venom in phthalic anhydride-induced atopic dermatitis animal model.

Lee YJ, Oh MJ, Lee DH et al. (2020) · Inflammopharmacology

$ PaywallDOI ↗PubMed ↗

Chemical profiling of Ziziphi spinosae semen using on-line comprehensive two-dimensional liquid chromatography-mass spectrometry based on a novel phthalic anhydride bonded stationary phase.

Zhao X, Yu D, Zhou W et al. (2023) · Journal of separation science

$ PaywallDOI ↗PubMed ↗

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

Sinonimi

PHTHALIC ANHYDRIDE · 85-44-9 · 1,3-Isobenzofurandione · 2-Benzofuran-1,3-dione · Phthalandione · Retarder esen · 1,3-Dioxophthalan · 1,3-Phthalandione · Phthalic acid anhydride · Retarder AK · Retarder PD · o-Phthalic acid anhydride · Phthalsaeureanhydrid · ESEN · Vulkalent B/C

Fonti dei dati

📊 PubChem CID 6811 — NIH
🔬 NIST WebBook — spektroskopia
💊 ChEMBL — bioaktywność

Acquista nel negozio

Phthalic anhydride (MA) →

Molecole correlate

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