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-Aspartic acid？

L-Aspartic acid 是一种化学品，CAS 登记号为 56-84-8。分子式: C4H7NO4. 摩尔质量: 133.10 g/mol. IUPAC: (2S)-2-aminobutanedioic acid.

L-Aspartic acid 的 CAS 号是多少？

L-Aspartic acid 的 CAS 号为 56-84-8——化学文摘社 (CAS) 的唯一标识符。

L-Aspartic acid 的分子式是什么？

分子式: C4H7NO4. 摩尔质量: 133.10 g/mol. logP (XLogP3): -2.8. PSA: 101 Å².

在哪里可以购买L-Aspartic acid？

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

L-Aspartic acid 的化学数据来自哪里？

L-Aspartic acid 的化学数据来自权威来源：PubChem (NIH), ChEMBL (EBI)。 PubChem CID: 5960. 符合 CLP 法规（EC 1272/2008），依据 CC-BY 4.0 许可提供。

L-Aspartic acid

CAS 56-84-8 · C₄H₇NO₄ · MW 133.10 g/mol

关于 L-Aspartic acid

L-Aspartic acid 是一种化学品，登记号为 CAS 56-84-8，分子式为 C₄H₇NO₄，摩尔质量为 133.10 g/mol。

该分子包含 16 个原子，通过 15 个化学键连接。该化合物的完整系统 IUPAC 名称为 (2S)-2-aminobutanedioic 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 = -2.8 (负值，亲水性化合物)，极性表面积 PSA = 101 Å²，3 个氢键供体和 5 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	C₄H₇NO₄
Masa molowa	133.10 g/mol
IUPAC	(2S)-2-aminobutanedioic acid
SMILES	`C([C@@H](C(=O)O)N)C(=O)O`
InChIKey	`CKLJMWTZIZZHCS-REOHCLBHSA-N`
logP (XLogP3)	-2.8
PSA	101 Å²
HBD / HBA	3 / 5
PubChem CID	CID 5960 ↗

科学文献

Literatura naukowa

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

📈 Timeline publikacji (5 artykułów)

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

Determination of Precipitation Limit of Zn(II) Ion with (2S)-2-Aminobutanedioic Acid

Fatmir Faiku, Haxhere Faiku, Arben Haziri et al. (2009) · American Journal of Biochemistry and Biotechnology

$ PaywallDOI ↗

Incorporation of (2S,3S) and (2S,3R) β-Methyl aspartic acid into RGD-Containing peptides

S Schabbert (2002) · Bioorganic & Medicinal Chemistry

Cytowania: 22$ PaywallDOI ↗

Synthesis of (2S)-4,4-difluoroproline, (2S,4R)-4-fluoroproline and their derivatives from (S)-aspartic acid

Fehn, Susanna, Klaus Burger, Rudolph, Martin et al. (1994) · Elsevier

Cytowania: 14$ PaywallDOI ↗

Primary deuterium isotope effects for the 3-methylaspartase-catalyzed deamination of (2S)-aspartic acid (2S,3S)-3-methylaspartic acid, and (2S,3S)-3-ethylaspartic acid

Nigel P. Botting, Mark A. Cohen, Mahmoud Akhtar et al. (1988) · Biochemistry

Cytowania: 10$ PaywallDOI ↗

ChemInform Abstract: Synthesis of 2S,3aS,7aS‐ and of 2S,3aR,7aR‐Perhydroindole‐2‐carboxylic Acid Derivatives from L‐Aspartic Acid.

D. H. R. BARTON, J. GUILHEM, Y. HERVE et al. (1987) · 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-aspartic acid · aspartic acid · 56-84-8 · (2S)-2-aminobutanedioic acid · Asparagic acid · L-Aminosuccinic acid · (S)-2-Aminosuccinic acid · Asparaginic acid · L-Asparaginic acid · L-Asparagic acid · (S)-Aspartic acid · Aspartic acid, L- · (S)-Aminobutanedioic acid · L-Asparaginsaeure · Acidum asparticum

数据来源

📊 PubChem CID 5960 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

在商店购买

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