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.

Wat is Phthalic anhydride (MA)?

Phthalic anhydride (MA) is een chemische verbinding, geregistreerd onder CAS-nummer 85-44-9. Brutoformule: C8H4O3. Molaire massa: 148.11 g/mol. IUPAC: 2-benzofuran-1,3-dione.

Wat is het CAS-nummer van Phthalic anhydride (MA)?

Het CAS-nummer van Phthalic anhydride (MA) is 85-44-9 — een unieke identificatie van de Chemical Abstracts Service (CAS).

Wat is de brutoformule van Phthalic anhydride (MA)?

Brutoformule: C8H4O3. Molaire massa: 148.11 g/mol. logP (XLogP3): 1.3. PSA: 43.4 Å².

Wat zijn de GHS-gevaren van Phthalic anhydride (MA)?

Volgens de GHS-classificatie moet Phthalic anhydride (MA) worden voorzien van de volgende gevarenaanduidingen: H302 (Schadelijk bij inslikken.), H335 (Kan irritatie van de luchtwegen veroorzaken.), H315 (Veroorzaakt huidirritatie.), H318 (Veroorzaakt ernstig oogletsel.), H334 (Kan bij inademing allergie- of astmasymptomen of ademhalingsmoeilijkheden veroorzaken.).

Waar kan ik Phthalic anhydride (MA) kopen?

Phthalic anhydride (MA) is verkrijgbaar in onze winkel. Bekijk het product: https://epchems.online/products/phthalic-anhydride/

Waar komen de chemische gegevens voor Phthalic anhydride (MA) vandaan?

De chemische gegevens voor Phthalic anhydride (MA) zijn afkomstig van gezaghebbende bronnen: PubChem (NIH), ChEMBL (EBI). PubChem CID: 6811. Conform de CLP-verordening (EG 1272/2008), beschikbaar onder de CC-BY 4.0-licentie.

Phthalic anhydride (MA)

Phthalic Anhydride

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

Over Phthalic anhydride (MA)

Phthalic anhydride (MA) is een chemische verbinding, geregistreerd onder nummer CAS 85-44-9, met de brutoformule C₈H₄O₃, en een molaire massa van 148.11 g/mol.

Het molecuul bevat 15 atomen verbonden door 16 chemische bindingen. De volledige systematische IUPAC-naam van deze verbinding is 2-benzofuran-1,3-dione. Het interactieve 3D-model hierboven toont de ruimtelijke rangschikking van de atomen — u kunt het met de muis draaien, met het scrollwiel inzoomen en schakelen tussen de weergavemodi skelet / Ball & Stick / Space Fill.

Wat de fysisch-chemische eigenschappen betreft, de verdelingscoëfficiënt logP = 1.3 (positieve waarde, lipofiele verbinding), polair oppervlak PSA = 43.4 Å², 0 donoren en 3 waterstofbrugacceptoren. Deze parameters zijn cruciaal bij de beoordeling van de biobeschikbaarheid en de interactie met biomoleculen.

De chemische gegevens voor deze verbinding zijn afkomstig van PubChem (NIH NLM NCBI), een van de grootste chemische databanken ter wereld. Alle informatie wordt automatisch bijgewerkt en verrijkt met vertalingen van GHS-gevarenaanduidingen conform de CLP-verordening (EG 1272/2008). De bovenstaande widget mag worden gebruikt voor educatieve, onderzoeks- en commerciële doeleinden.

Fysisch-chemische eigenschappen

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 ↗

GHS-veiligheid

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

Wetenschappelijke literatuur

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.

Synoniemen

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

Gegevensbronnen

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

Kopen in de winkel

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