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.

Qu'est-ce que Phthalic anhydride (MA) ?

Phthalic anhydride (MA) est un composé chimique enregistré sous le numéro CAS 85-44-9. Formule brute: C8H4O3. Masse molaire: 148.11 g/mol. IUPAC: 2-benzofuran-1,3-dione.

Quel est le numéro CAS de Phthalic anhydride (MA) ?

Le numéro CAS de Phthalic anhydride (MA) est 85-44-9 — un identifiant unique du Chemical Abstracts Service (CAS).

Quelle est la formule brute de Phthalic anhydride (MA) ?

Formule brute: C8H4O3. Masse molaire: 148.11 g/mol. logP (XLogP3): 1.3. PSA: 43.4 Å².

Quels sont les dangers GHS de Phthalic anhydride (MA) ?

Selon la classification GHS, Phthalic anhydride (MA) doit porter les mentions de danger suivantes : H302 (Nocif en cas d'ingestion.), H335 (Peut irriter les voies respiratoires.), H315 (Provoque une irritation cutanée.), H318 (Provoque des lésions oculaires graves.), H334 (Peut provoquer des symptômes allergiques ou d'asthme ou des difficultés respiratoires par inhalation.).

Où acheter Phthalic anhydride (MA) ?

Phthalic anhydride (MA) est disponible dans notre boutique. Voir le produit : https://epchems.online/products/phthalic-anhydride/

D'où proviennent les données chimiques de Phthalic anhydride (MA) ?

Les données chimiques de Phthalic anhydride (MA) proviennent de sources faisant autorité : PubChem (NIH), ChEMBL (EBI). PubChem CID: 6811. Conformes au règlement CLP (CE 1272/2008), disponibles sous licence CC-BY 4.0.

Phthalic anhydride (MA)

Phthalic Anhydride

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

À propos de Phthalic anhydride (MA)

Phthalic anhydride (MA) est un composé chimique enregistré sous le numéro CAS 85-44-9, de formule brute C₈H₄O₃, et de masse molaire 148.11 g/mol.

La molécule contient 15 atomes reliés par 16 liaisons chimiques. Le nom systématique IUPAC complet de ce composé est 2-benzofuran-1,3-dione. Le modèle 3D interactif ci-dessus permet de visualiser l'arrangement spatial des atomes — vous pouvez le faire pivoter à la souris, zoomer avec la molette et basculer entre les modes de visualisation squelette / Ball & Stick / Space Fill.

Du point de vue des propriétés physico-chimiques, le coefficient de partage logP = 1.3 (valeur positive, composé lipophile), surface polaire PSA = 43.4 Å², 0 donneurs et 3 accepteurs de liaisons hydrogène. Ces paramètres sont essentiels pour évaluer la biodisponibilité et l'interaction avec les biomolécules.

Les données chimiques de ce composé proviennent de PubChem (NIH NLM NCBI), l'une des plus grandes bases de données chimiques au monde. Toutes les informations sont mises à jour automatiquement et enrichies de traductions des mentions de danger GHS conformes au règlement CLP (CE 1272/2008). Le widget ci-dessus peut être utilisé à des fins éducatives, de recherche et commerciales.

Propriétés physico-chimiques

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 ↗

Sécurité 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

Littérature scientifique

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 ↗

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3,6-Dimethyl-o-phenylenedimethanol

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

Open AccessDOI ↗PDF ↗

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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.

Synonymes

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

Sources des données

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

Acheter en boutique

Phthalic anhydride (MA) →

Molécules apparentées

Trichloroethylene CAS 127-18-4 · C2Cl4 Trichloroethylene CAS 127-18-4 · C2Cl4 L-Cysteine CAS 52-90-4 · C3H7NO2S Ethylene glycol diacetate CAS 111-55-7 · C6H10O4 Benzyl Alcohol CAS 100-51-6 · C7H8O Sodium Dodecyl Sulfonate (SDS) CAS 2386-53-0 · C12H25NaO3S