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.

什么是Iron oxide black？

Iron oxide black 是一种化学品，CAS 登记号为 12227-89-3。分子式: Fe₃O₄. 摩尔质量: 231.53 g/mol. IUPAC: oxoiron;oxo(oxoferriooxy)iron.

Iron oxide black 的 CAS 号是多少？

Iron oxide black 的 CAS 号为 12227-89-3——化学文摘社 (CAS) 的唯一标识符。

Iron oxide black 的分子式是什么？

分子式: Fe₃O₄. 摩尔质量: 231.53 g/mol. PSA: 60.4 Å².

在哪里可以购买Iron oxide black？

Iron oxide black 在我们的商店有售。查看产品：https://epchems.online/products/iron-oxide-black/

Iron oxide black 的化学数据来自哪里？

Iron oxide black 的化学数据来自权威来源：PubChem (NIH)。 PubChem CID: 16211978. 符合 CLP 法规（EC 1272/2008），依据 CC-BY 4.0 许可提供。

Iron oxide black

Iron oxide (Fe3O4)

CAS 12227-89-3 · Fe₃O₄ · MW 231.53 g/mol

关于 Iron oxide black

Iron oxide black 是一种化学品，登记号为 CAS 12227-89-3，分子式为 Fe₃O₄，摩尔质量为 231.53 g/mol。

该分子包含 7 个原子，通过 5 个化学键连接。该化合物的完整系统 IUPAC 名称为 oxoiron;oxo(oxoferriooxy)iron。上方的交互式 3D 模型可查看原子的空间排列——您可以用鼠标旋转、用滚轮缩放，并在骨架 / 球棍 (Ball & Stick) / 空间填充 (Space Fill) 显示模式之间切换。

在理化性质方面，极性表面积 PSA = 60.4 Å²，0 个氢键供体和 4 个氢键受体。这些参数对于评估生物利用度以及与生物分子的相互作用至关重要。

该化合物的化学数据来自 PubChem（NIH NLM NCBI），全球最大的化学数据库之一。所有信息均自动更新，并附有符合 CLP 法规（EC 1272/2008）的 GHS 危险说明翻译。上方的小部件可用于教育、研究和商业用途。

理化性质

Wzór sumaryczny	Fe₃O₄
Masa molowa	231.53 g/mol
IUPAC	oxoiron;oxo(oxoferriooxy)iron
SMILES	`O=[Fe].O=[Fe]O[Fe]=O`
InChIKey	`SZVJSHCCFOBDDC-UHFFFAOYSA-N`
logP (XLogP3)	—
PSA	60.4 Å²
HBD / HBA	0 / 4
PubChem CID	CID 16211978 ↗

GHS 安全

Sygnał: Uwaga

GHS07

科学文献

Literatura naukowa

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

ChemInform Abstract: THE APPLICATION OF MOESSBAUER SPECTROSCOPY TO THE STUDY OF THE INTERACTION OF THE COPPER(II) OXIDE‐IRON OXIDE (FE3O4), COPPER(I) OXIDE‐IRON OXIDE (FE3O4), AND COPPER(I) OXIDE‐ZINC OXIDE‐IRON OXIDE (FE3O4) SYSTEMS.

(1980)

$ 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.

同义词

Ferriferrous Oxide · Oxide, Ferriferrous · Oxide, Ferrosoferric · RefChem:923566 · NSC729745 · 1317-61-9 · 215-277-5 · Black Iron Oxide · C.I. 77499 · CHEBI:50821 · EPT 500 · ferric ferrous oxide · Ferrosoferric Oxide · Iron (II, III) Oxide · Iron ores, magnetite

数据来源

📊 PubChem CID 16211978 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

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