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Phosphotungstic acid？

Phosphotungstic acid 是一种化学品，CAS 登记号为 12067-99-1。分子式: W12PHO39·H2O. 摩尔质量: 2880.1 g/mol. IUPAC: phosphoric acid;dodecakis(trioxotungsten).

Phosphotungstic acid 的 CAS 号是多少？

Phosphotungstic acid 的 CAS 号为 12067-99-1——化学文摘社 (CAS) 的唯一标识符。

Phosphotungstic acid 的分子式是什么？

分子式: W12PHO39·H2O. 摩尔质量: 2880.1 g/mol. PSA: 692 Å².

Phosphotungstic acid 有哪些 GHS 危害？

根据 GHS 分类，Phosphotungstic acid 须标注以下危险说明： H314 (造成严重皮肤灼伤和眼损伤).

在哪里可以购买Phosphotungstic acid？

Phosphotungstic acid 在我们的商店有售。查看产品：https://epchems.online/products/phosphotungstic-acid/

Phosphotungstic acid 的化学数据来自哪里？

Phosphotungstic acid 的化学数据来自权威来源：PubChem (NIH)。 PubChem CID: 90478944. 符合 CLP 法规（EC 1272/2008），依据 CC-BY 4.0 许可提供。

Phosphotungstic acid

Tungsten hydroxide oxide phosphate

CAS 12067-99-1 · W₁₂PHO₃₉·H₂O · MW 2880.1 g/mol

关于 Phosphotungstic acid

Phosphotungstic acid 是一种化学品，登记号为 CAS 12067-99-1，分子式为 W₁₂PHO₃₉·H₂O，摩尔质量为 2880.1 g/mol。

该分子包含 56 个原子，通过 43 个化学键连接。该化合物的完整系统 IUPAC 名称为 phosphoric acid;dodecakis(trioxotungsten)。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 = 692 Å²，3 个氢键供体和 40 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	W₁₂PHO₃₉·H₂O
Masa molowa	2880.1 g/mol
IUPAC	phosphoric acid;dodecakis(trioxotungsten)
SMILES	`OP(=O)(O)O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O`
InChIKey	`IYDGMDWEHDFVQI-UHFFFAOYSA-N`
logP (XLogP3)	—
PSA	692 Å²
HBD / HBA	3 / 40
PubChem CID	CID 90478944 ↗

GHS 安全

Sygnał: Niebezpieczeństwo

GHS05

H314 — Powoduje poważne oparzenia skóry oraz uszkodzenia oczu

科学文献

Literatura naukowa

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

📈 Timeline publikacji (3 artykułów)

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

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Phosphotungstic Acid-treated Picrosirius Red Staining Improves Whole-slide Quantitative Analysis of Collagen in Histological Specimens.

Mukade Y, Kobayashi S, Nishijima Y et al. (2023) · The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society

Open AccessDOI ↗PubMed ↗PDF ↗

Keggin type phosphotungstic acid intercalated copper-chromium-layered double hydroxide reinforced porous hollow fiber as a sorbent for hollow fiber solid phase microextraction of selected chlorophenols besides their quantification via high performance liquid chromatography.

Darvishnejad F, Raoof JB, Ghani M et al. (2023) · Journal of chromatography. A

$ PaywallDOI ↗PubMed ↗

Phosphotungstic Acid 12067‐99‐1.

(2004)

$ 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

Acid, Phosphotungstic · RefChem:900737 · 215-682-7 · 235-087-6 · 12067-99-1 · 5KAC2X78XM · Phosphotungstic Acid · Tungsten hydroxide oxide phosphate · Tungstophosphoric acid · dodecatungstophosphoric acid · phosphoric acid;trioxotungsten · NPW 40 · PHOSPHOTUNGSTIC ACID [MI] · TUNGSTOPHOSPHORIC ACID (H3W12PO40) · USP Solution Phosphotungstic Acid TS Conforms to USP

数据来源

📊 PubChem CID 90478944 — NIH
🔬 NIST WebBook — spektroskopia
💊 ChEMBL — bioaktywność

在商店购买

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