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.

什么是苏氨酸？

苏氨酸是一种化学品，CAS 登记号为 72-19-5。分子式: C4H9NO3. 摩尔质量: 119.12 g/mol. IUPAC: (2S,3R)-2-amino-3-hydroxybutanoic acid.

苏氨酸的 CAS 号是多少？

苏氨酸的 CAS 号为 72-19-5——化学文摘社 (CAS) 的唯一标识符。

苏氨酸的分子式是什么？

分子式: C4H9NO3. 摩尔质量: 119.12 g/mol. logP (XLogP3): -2.9. PSA: 83.6 Å².

在哪里可以购买苏氨酸？

苏氨酸在我们的商店有售。查看产品：https://epchems.online/products/l-threonine/

苏氨酸的化学数据来自哪里？

苏氨酸的化学数据来自权威来源：PubChem (NIH), ChEMBL (EBI)。 PubChem CID: 6288. 符合 CLP 法规（EC 1272/2008），依据 CC-BY 4.0 许可提供。

苏氨酸

CAS 72-19-5 · C₄H₉NO₃ · MW 119.12 g/mol

关于苏氨酸

苏氨酸 是一种化学品，登记号为 CAS 72-19-5，分子式为 C₄H₉NO₃，摩尔质量为 119.12 g/mol。

该分子包含 17 个原子，通过 16 个化学键连接。该化合物的完整系统 IUPAC 名称为 (2S,3R)-2-amino-3-hydroxybutanoic 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 = -2.9 (负值，亲水性化合物)，极性表面积 PSA = 83.6 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	C₄H₉NO₃
Masa molowa	119.12 g/mol
IUPAC	(2S,3R)-2-amino-3-hydroxybutanoic acid
SMILES	`C[C@H]([C@@H](C(=O)O)N)O`
InChIKey	`AYFVYJQAPQTCCC-GBXIJSLDSA-N`
logP (XLogP3)	-2.9
PSA	83.6 Å²
HBD / HBA	3 / 4
PubChem CID	CID 6288 ↗

科学文献

Literatura naukowa

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

📈 Timeline publikacji (10 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

Cytowania: 27Open AccessDOI ↗PDF ↗

Synthesis of (2R, 3S)- or (2S, 3R)-2-amino-3-trifluoromethyl-3-hydroxyalkanoic acid derivatives (threonine and allo-threonine analogs) from enantiopure 4,4,4-trifluoro-3-hydroxybutanoic acid

Andrea R. Sting, Dieter Seebach (1996) · Tetrahedron

Cytowania: 34$ PaywallDOI ↗

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Threonine-rich carboxyl-terminal extension drives aggregation of stalled polypeptides.

Chang WD, Yoon MJ, Yeo KH et al. (2024) · Molecular cell

Open AccessDOI ↗PubMed ↗PDF ↗

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Comprehensive analysis of peripheral blood free amino acids in MASLD: the impact of glycine-serine-threonine metabolism.

Mino M, Kakazu E, Sano A et al. (2024) · Amino acids

Open AccessDOI ↗PubMed ↗PDF ↗

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Glycosylation of serine/threonine-rich intrinsically disordered regions of membrane-associated proteins in streptococci.

Rahman MM, Zamakhaeva S, Rush JS et al. (2025) · Nature communications

Open AccessDOI ↗PubMed ↗PDF ↗

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Threonine phosphorylation of STAT1 safeguards gut epithelial integrity and restricts interferon-mediated cytotoxicity.

Metwally H, Elbrashy MM, Kayama H et al. (2025) · Proceedings of the National Academy of Sciences of the United States of America

Open AccessDOI ↗PubMed ↗PDF ↗

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Threonine fuels glioblastoma through YRDC-mediated codon-biased translational reprogramming.

Wu X, Yuan H, Wu Q et al. (2024) · Nature cancer

Open AccessDOI ↗PubMed ↗PDF ↗

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An atlas of substrate specificities for the human serine/threonine kinome.

Johnson JL, Yaron TM, Huntsman EM et al. (2023) · Nature

Open AccessDOI ↗PubMed ↗PDF ↗

A novel O-GlcNAcylation at threonine 71 of histone H4 is a component of heterochromatin.

Hayakawa K, Hirosawa M, Nara D et al. (2025) · Journal of biochemistry

$ PaywallDOI ↗PubMed ↗

ChemInform Abstract: Synthesis of (2R,3S)‐ or (2S,3R)‐2‐Amino‐3‐trifluoromethyl‐3‐ hydroxyalkanoic Acid Derivatives (Threonine and allo‐Threonine Analogues) from Enantiopure 4,4,4‐Trifluoro‐3‐hydroxybutanoic Acid.

A. R. STING, D. SEEBACH (1996) · ChemInform

$ PaywallDOI ↗

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-threonine · threonine · 72-19-5 · (2S,3R)-2-amino-3-hydroxybutanoic acid · Threonin · L-(-)-Threonine · (S)-Threonine · 2-amino-3-hydroxybutyric acid · Treonina · (2S,3R)-2-Amino-3-hydroxybutyric acid · Threoninum · L-Threonin · L-thr · (2S)-threonine · L-2-Amino-3-hydroxybutyric acid

数据来源

📊 PubChem CID 6288 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

在商店购买

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