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.

L-Valine 是一种化学品，CAS 登记号为 72-18-4。分子式: C5H11NO2. 摩尔质量: 117.15 g/mol. IUPAC: (2S)-2-amino-3-methylbutanoic acid.

L-Valine 的 CAS 号是多少？

L-Valine 的 CAS 号为 72-18-4——化学文摘社 (CAS) 的唯一标识符。

L-Valine 的分子式是什么？

分子式: C5H11NO2. 摩尔质量: 117.15 g/mol. logP (XLogP3): -2.3. PSA: 63.3 Å².

在哪里可以购买L-Valine？

L-Valine 在我们的商店有售。查看产品：https://epchems.online/products/l-valine/

L-Valine 的化学数据来自哪里？

L-Valine 的化学数据来自权威来源：PubChem (NIH), ChEMBL (EBI)。 PubChem CID: 6287. 符合 CLP 法规（EC 1272/2008），依据 CC-BY 4.0 许可提供。

L-Valine

CAS 72-18-4 · C₅H₁₁NO₂ · MW 117.15 g/mol

关于 L-Valine

L-Valine 是一种化学品，登记号为 CAS 72-18-4，分子式为 C₅H₁₁NO₂，摩尔质量为 117.15 g/mol。

该分子包含 19 个原子，通过 18 个化学键连接。该化合物的完整系统 IUPAC 名称为 (2S)-2-amino-3-methylbutanoic 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 = -2.3 (负值，亲水性化合物)，极性表面积 PSA = 63.3 Å²，2 个氢键供体和 3 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	C₅H₁₁NO₂
Masa molowa	117.15 g/mol
IUPAC	(2S)-2-amino-3-methylbutanoic acid
SMILES	`CC(C)[C@@H](C(=O)O)N`
InChIKey	`KZSNJWFQEVHDMF-BYPYZUCNSA-N`
logP (XLogP3)	-2.3
PSA	63.3 Å²
HBD / HBA	2 / 3
PubChem CID	CID 6287 ↗

科学文献

Literatura naukowa

10 artykułów · 2 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

📈 Timeline publikacji (10 artykułów)

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

Thermodynamic Study of Some Amino Acids, 2-Aminopropanoic Acid, 2-Amino-3-methylbutanoic Acid, 2-Amino-4-methylpentanoic Acid, and 2-Amino-3-phenylpropanoic Acid in Aqueous Saccharide Solutions at Different Temperatures: Volumetric and Ultrasonic Study

Amalendu Pal, Nalin Chauhan (2011) · Journal of Chemical & Engineering Data

Cytowania: 41$ PaywallDOI ↗

Volumetric and Conductometric Behavior at T = 298.15 K of 2-[(2-Aminoacetyl)amino]acetic Acid, 2-[(2-Aminoacetyl)amino]-3-methylbutanoic Acid, and (2S)-2-[(2-Aminoacetyl)amino]-4-methylpentanoic Acid with Sodium Hexanoate

Zhenning Yan, Yang Zhao, Ronghua Xing et al. (2009) · Journal of Chemical & Engineering Data

Cytowania: 13$ PaywallDOI ↗

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(S,S)-2-(((Hydroxynaphth-1-yl)(4′-nitrophenyl)methyl)amino)-3-methylbutanoic Acid Methyl Ester

Maria Annunziata M. Capozzi, Cosimo Cardellicchio (2022) · Molbank

Cytowania: 3Open AccessDOI ↗PDF ↗

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SimpleDesign: A Joint Model for Protein Sequence and Structure Codesign

Jiarui Lu, Yuyang Wang, Yizhe Zhang et al. (2026) · arXiv (2609.03377v1)

Open AccessPDF ↗

( R )‐2‐Amino‐3‐mercapto‐3‐methylbutanoic Acid

Boheng Guan, Xuyu Liu (2026) · Encyclopedia of Reagents for Organic Synthesis

$ PaywallDOI ↗

2,4-Diamino-3-methylbutanoic acid, a novel amino acid in root nodule hydrolysates from Lotus tenuis

G.John Shaw, P.J. Ellingham, L.N. Nixon (1981) · Phytochemistry

Cytowania: 9$ PaywallDOI ↗

Coupling of [[922|ethyl (2S)‐2‐[(2S)‐2‐amino‐3‐phenylpropanamido]‐3‐phenylpropanoate trifluoroacetate salt]] with 2-naphthoxyacetic acid

Bart Dietrich (2020) · ChemSpider Synthetic Pages

$ PaywallDOI ↗

Diffusion coefficient of DL-2-amino-3-methylbutanoic acid in water

Jochen Winkelmann (2018) · Diffusion in Gases, Liquids and Electrolytes

$ PaywallDOI ↗

Crystal structure of leukotriene A4 hydrolase in complex with (2S)-2-amino-5-[[4-[(2S)-2-hydroxy-2-phenyl-ethoxy]phenyl]amino]-5-oxo-pentanoic acid

M.M.G.M. Thunnissen, M. Adler, M. Whitlow (2008) · Worldwide Protein Data Bank

$ PaywallDOI ↗

Crystal structure of ERAP2 aminopeptidase in complex with phosphinic pseudotripeptide((1R)-1-Amino-3-phenylpropyl){(2S)-3-[((2S)-1-amino-1-oxo-3-phenylpropan-2-yl)amino]-2-{[3-(2-hydroxyphenyl)-isoxazol-5-yl]methyl}-3-oxopropyl}phosphinic acid

P. Giastas, E. Stratikos, A. Mpakali (2022)

$ 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-valine · valine · 72-18-4 · (S)-Valine · (2S)-2-amino-3-methylbutanoic acid · (S)-2-Amino-3-methylbutanoic acid · 2-Amino-3-methylbutyric acid · (S)-2-Amino-3-methylbutyric acid · valina · L-alpha-Amino-beta-methylbutyric acid · L-valin · Valinum · (S)-alpha-Amino-beta-methylbutyric acid · NSC-76038 · l-(+)-alpha-Aminoisovaleric acid

数据来源

📊 PubChem CID 6287 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

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