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L-半胱氨酸？

L-半胱氨酸是一种化学品，CAS 登记号为 52-90-4。分子式: C3H7NO2S. 摩尔质量: 121.16 g/mol. IUPAC: (2R)-2-amino-3-sulfanylpropanoic acid.

L-半胱氨酸的 CAS 号是多少？

L-半胱氨酸的 CAS 号为 52-90-4——化学文摘社 (CAS) 的唯一标识符。

L-半胱氨酸的分子式是什么？

分子式: C3H7NO2S. 摩尔质量: 121.16 g/mol. logP (XLogP3): -2.5. PSA: 64.3 Å².

L-半胱氨酸有哪些 GHS 危害？

根据 GHS 分类，L-半胱氨酸须标注以下危险说明： H302 (吞咽有害).

在哪里可以购买L-半胱氨酸？

L-半胱氨酸在我们的商店有售。查看产品：https://epchems.online/products/l-cysteine/

L-半胱氨酸的化学数据来自哪里？

L-半胱氨酸的化学数据来自权威来源：PubChem (NIH), ChEMBL (EBI)。 PubChem CID: 5862. 符合 CLP 法规（EC 1272/2008），依据 CC-BY 4.0 许可提供。

L-半胱氨酸

L-(+)-Cysteine

CAS 52-90-4 · C₃H₇NO₂S · MW 121.16 g/mol

关于 L-半胱氨酸

L-半胱氨酸 是一种化学品，登记号为 CAS 52-90-4，分子式为 C₃H₇NO₂S，摩尔质量为 121.16 g/mol。

该分子包含 14 个原子，通过 13 个化学键连接。该化合物的完整系统 IUPAC 名称为 (2R)-2-amino-3-sulfanylpropanoic acid。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，分配系数 logP = -2.5 (负值，亲水性化合物)，极性表面积 PSA = 64.3 Å²，3 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	C₃H₇NO₂S
Masa molowa	121.16 g/mol
IUPAC	(2R)-2-amino-3-sulfanylpropanoic acid
SMILES	`C([C@@H](C(=O)O)N)S`
InChIKey	`XUJNEKJLAYXESH-REOHCLBHSA-N`
logP (XLogP3)	-2.5
PSA	64.3 Å²
HBD / HBA	3 / 4
PubChem CID	CID 5862 ↗

GHS 安全

Sygnał: Uwaga

GHS07

H302 — Działa szkodliwie po połknięciu

科学文献

Literatura naukowa

7 artykułów · 6 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

📈 Timeline publikacji (7 artykułów)

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

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Heat Capacities of L-Cysteine, L-Serine, L-Threonine, L-Lysine, and L-Methionine

Václav Pokorný, Vojtěch Štejfa, Jakub Havlín et al. (2023) · Molecules

Open AccessDOI ↗PDF ↗

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A fluorescent probe for concurrent detection of cysteine, homocysteine, and superoxide anion.

Li Y, Yu T, Wang Z et al. (2025) · Science advances

Open AccessDOI ↗PubMed ↗PDF ↗

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Lamin A/C-regulated cysteine catabolic flux modulates stem cell fate through epigenome reprogramming.

Wang Y, Shi H, Wittig J et al. (2026) · Nature metabolism

Open AccessDOI ↗PubMed ↗PDF ↗

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Cysteine-enabled cleavability to advance cross-linking mass spectrometry for global analysis of endogenous protein-protein interactions.

Jiao F, Braitbard M, Yu C et al. (2025) · Nature communications

Open AccessDOI ↗PubMed ↗PDF ↗

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EGFR inhibitor-resistant lung cancers exhibit collateral sensitivity to a covalent, cysteine-independent KEAP1 oligomerizing molecular bridge.

Bassil CF, Dillon K, Anderson GR et al. (2026) · Nature communications

Open AccessDOI ↗PubMed ↗PDF ↗

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Endothelial Drp1 integrates VEGF-induced redox signaling with glycolysis through cysteine oxidation to drive angiogenesis.

Nagarkoti S, Kim YM, Das A et al. (2026) · Nature communications

Open AccessDOI ↗PubMed ↗PDF ↗

Revitalizing p-GSK-3β via cysteine sulfenylation promotes hepatic insulin resistance by differentially regulating glycogenesis and gluconeogenesis.

Chen J, Liu Z, Gu J et al. (2026) · Nature metabolism

$ 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.

同义词

L-cysteine · 52-90-4 · cysteine · Cystein · (R)-2-Amino-3-mercaptopropanoic acid · Thioserine · Half-cystine · L-(+)-Cysteine · beta-Mercaptoalanine · L-Cystein · (2R)-2-amino-3-sulfanylpropanoic acid · Cysteinum · L-Cys · cisteina · Half cystine

数据来源

📊 PubChem CID 5862 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

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