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-酒石酸？

L-酒石酸是一种化学品，CAS 登记号为 87-69-4。分子式: C4H6O6. 摩尔质量: 150.09 g/mol. IUPAC: (2R,3R)-2,3-dihydroxybutanedioic acid.

L-酒石酸的 CAS 号是多少？

L-酒石酸的 CAS 号为 87-69-4——化学文摘社 (CAS) 的唯一标识符。

L-酒石酸的分子式是什么？

分子式: C4H6O6. 摩尔质量: 150.09 g/mol. logP (XLogP3): -1.9. PSA: 115 Å².

在哪里可以购买L-酒石酸？

L-酒石酸在我们的商店有售。查看产品：https://epchems.online/products/l-tartaric-acid/

L-酒石酸的化学数据来自哪里？

L-酒石酸的化学数据来自权威来源：PubChem (NIH)。 PubChem CID: 444305. 符合 CLP 法规（EC 1272/2008），依据 CC-BY 4.0 许可提供。

L-酒石酸

L-Tartaric acid

CAS 87-69-4 · C₄H₆O₆ · MW 150.09 g/mol

关于 L-酒石酸

L-酒石酸 是一种化学品，登记号为 CAS 87-69-4，分子式为 C₄H₆O₆，摩尔质量为 150.09 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 (2R,3R)-2,3-dihydroxybutanedioic 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 = -1.9 (负值，亲水性化合物)，极性表面积 PSA = 115 Å²，4 个氢键供体和 6 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	C₄H₆O₆
Masa molowa	150.09 g/mol
IUPAC	(2R,3R)-2,3-dihydroxybutanedioic acid
SMILES	`[C@@H]([C@H](C(=O)O)O)(C(=O)O)O`
InChIKey	`FEWJPZIEWOKRBE-JCYAYHJZSA-N`
logP (XLogP3)	-1.9
PSA	115 Å²
HBD / HBA	4 / 6
PubChem CID	CID 444305 ↗

GHS 安全

Sygnał: Niebezpieczeństwo

GHS05

GHS07

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.

Study of the diastereoisomers formed between (N-alkyl)-pipecolic acid-anilides and 2R,3R-tartaric acid or O,O′-dibenzoyl-2R,3R-tartaric acid. Do the tartaric acids form molecular-complexes, instead of salts during optical resolutions?

Katalin Nemák, Mária Acs, Zsuzsa M. Jászay et al. (1996) · Tetrahedron

Cytowania: 32$ PaywallDOI ↗

Optical resolution of racemic alcohols by diastereoisomeric complex formation with O,O′-dibenzoyl-(2R,3R)-tartaric acid; the crystal structure of the (–)-(1R,2S,5R)-menthol·O,O′-dibenzoyl-(2R,3R)-tartaric acid complex

Dávid Kozma, Zsolt Böcskei, Csaba Kassai et al. (1996) · Chem. Commun.

Cytowania: 12$ PaywallDOI ↗

SYNTHESIS OF (2R,3R) 0,0-DIPIVALOYLTARTARIC ACID (<i>DPTA</i>) AND OF (2R,3R) 0,0-DI(ADAMANTANE-1 CARBONYL) TARTARIC ACID (<i>DATA</i>), USEFUL CHIRAL REAGENTS FOR ASYMMETRIC PROTONATIONS

L. Duhamel, J. C. Plaquevent (1982) · Organic Preparations and Procedures International

Cytowania: 9$ PaywallDOI ↗

ChemInform Abstract: SYNTHESIS OF (2R,3R)‐O,O‐DIPIVALOYLTARTARIC ACID (DPTA) AND OF (2R,3R)‐O,O‐BIS(ADAMANTANE‐1‐CARBONYL)TARTARIC ACID (DATA), USEFUL CHIRAL REAGENTS FOR ASYMMETRIC PROTONATIONS

L. DUHAMEL, J. C. PLAQUEVENT (1983) · Chemischer Informationsdienst

$ PaywallDOI ↗

ChemInform Abstract: Study of the Diastereoisomers Formed Between (N‐Alkyl)‐pipecolic Acid Anilides and 2R,3R‐Tartaric Acid of O,O′‐Dibenzoyl‐2R,3R‐tartaric Acid. Do the Tartaric Acid Form Molecular Complexes Instead of Salts During Optical Resolutions?

K. NEMAK, M. ACS, Z. M. JASZAY et al. (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-tartaric acid · 87-69-4 · L-(+)-Tartaric acid · L(+)-Tartaric acid · tartaric acid · (2R,3R)-2,3-dihydroxysuccinic acid · (2R,3R)-2,3-dihydroxybutanedioic acid · (+)-Tartaric acid · (+)-L-Tartaric acid · (R,R)-Tartaric acid · Threaric acid · Dextrotartaric acid · L-threaric acid · Natural tartaric acid · (+)-(R,R)-Tartaric acid

数据来源

📊 PubChem CID 444305 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

在商店购买

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