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-Cystine？

L-Cystine 是一种化学品，CAS 登记号为 30925-07-6。分子式: C6H14Cl2N2O4S2. 摩尔质量: 313.2 g/mol. IUPAC: (2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid;dihydrochloride.

L-Cystine 的 CAS 号是多少？

L-Cystine 的 CAS 号为 30925-07-6——化学文摘社 (CAS) 的唯一标识符。

L-Cystine 的分子式是什么？

分子式: C6H14Cl2N2O4S2. 摩尔质量: 313.2 g/mol. PSA: 177 Å².

L-Cystine 有哪些 GHS 危害？

根据 GHS 分类，L-Cystine 须标注以下危险说明： H314 (造成严重皮肤灼伤和眼损伤), H318 (造成严重眼损伤).

在哪里可以购买L-Cystine？

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

L-Cystine 的化学数据来自哪里？

L-Cystine 的化学数据来自权威来源：PubChem (NIH)。 PubChem CID: 21121987. 符合 CLP 法规（EC 1272/2008），依据 CC-BY 4.0 许可提供。

L-Cystine

Cystine dihydrochloride

CAS 30925-07-6 · C₆H₁₄Cl₂N₂O₄S₂ · MW 313.2 g/mol

关于 L-Cystine

L-Cystine 是一种化学品，登记号为 CAS 30925-07-6，分子式为 C₆H₁₄Cl₂N₂O₄S₂，摩尔质量为 313.2 g/mol。

该分子包含 30 个原子，通过 27 个化学键连接。该化合物的完整系统 IUPAC 名称为 (2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid;dihydrochloride。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，极性表面积 PSA = 177 Å²，6 个氢键供体和 8 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	C₆H₁₄Cl₂N₂O₄S₂
Masa molowa	313.2 g/mol
IUPAC	(2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid;dihydrochloride
SMILES	`C([C@@H](C(=O)O)N)SSC[C@@H](C(=O)O)N.Cl.Cl`
InChIKey	`HHGZUQPEIHGQST-RGVONZFCSA-N`
logP (XLogP3)	—
PSA	177 Å²
HBD / HBA	6 / 8
PubChem CID	CID 21121987 ↗

GHS 安全

Sygnał: Niebezpieczeństwo

GHS05

H314 — Powoduje poważne oparzenia skóry oraz uszkodzenia oczu

H318 — Powoduje poważne uszkodzenie oczu

科学文献

Literatura naukowa

20 artykułów · 16 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

📈 Timeline publikacji (20 artykułów)

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

A concise, asymmetric synthesis of (2R,3R)-3-hydroxyaspartic acid

J. K. Khalaf, A. Datta (2007) · Amino Acids

Cytowania: 9$ PaywallDOI ↗

Total synthesis of (5S,6R,7E,9E,11Z,14Z)-5-hydroxy-6-[(2R)-2-amino-2-(carboxyethyl)thio]-7,9,11,14-eicosatetraenoic acid, a potent SRS-A

Michael Rosenberger, Christian Neukom (1980) · Journal of the American Chemical Society

Cytowania: 41$ PaywallDOI ↗

The first asymmetric total syntheses of 3((1R,2R)- and 3((1S,2R)-2-(12-methyltridecyl)cyclopropyl)propanoic acid

Debendra K. Mohapatra, Nagesh Guguloth, J.S. Yadav (2012) · Tetrahedron Letters

Cytowania: 4$ PaywallDOI ↗

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Asymmetric Syntheses of (2R, 4S)-4-Amino-4-carboxy-2-methylpyrrolidine and (2R, 4S)-4-Amino-2-carboxy-2-ethylpyrrolidine as Novel 2-Alkyl-substituted (-)-Cucurbitine Analogues

Ken-ichi Tanaka, Hirokazu Suzuki, Hiroyuki Sawanishi (1996) · HETEROCYCLES

Cytowania: 9Open AccessDOI ↗PDF ↗

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Understanding surface potential dynamics of passivated perovskites via Kelvin Probe Force Microscopy

Rehmat Sood-Goodwin, Xue-Li Cao, Benjamin C. Kinvig et al. (2026) · arXiv (2607.07221v2)

Open AccessPDF ↗

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ProteinJEPA: Latent prediction complements protein language models

Dan Ofer, Dafna Shahaf, Michal Linial (2026) · arXiv (2605.07554v1)

Open AccessPDF ↗

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Towards an understanding of magnesium in a biological environment: A density functional theory study

Miranda Naurin, Sally Aldhaim, Moltas Elliver et al. (2026) · arXiv (2603.01648v1)

Open AccessDOI ↗PDF ↗

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Organic Acid Chemistry in ISM: Detection of Formic Acid and its Prebiotic Chemistry in Hot Core G358.93$-$0.03 MM1

Arijit Manna, Sabyasachi Pal, Sekhar Sinha et al. (2026) · arXiv (2602.09656v1)

Open AccessDOI ↗PDF ↗

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Tuning Terahertz Optomechanics of MoS2 Bilayers with Homogeneous In-plane Strain

S. Patel, Jose D. Mella, S. Puri et al. (2026) · arXiv (2602.03996v3)

Open AccessDOI ↗PDF ↗

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Surface Passivation for Halide Optoelectronics: Comparing Optimization and Reactivity of Amino-Silanes with Formamidinium

Zixu Huang, Farhad Akrami, Junxiang Zhang et al. (2025) · arXiv (2509.03713v1)

Open AccessPDF ↗

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First detection of ethylene oxide and acetaldehyde in hot core G358.93$-$0.03 MM1: Tracing prebiotic oxygen chemistry

Arijit Manna, Sabyasachi Pal (2025) · arXiv (2509.03382v1)

Open AccessDOI ↗PDF ↗

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Crystalline water intercalation into the Kitaev honeycomb cobaltate Na$_2$Co$_2$TeO$_6$

Masaaki Ito, Yuya Haraguchi, Teruki Motohashi et al. (2025) · arXiv (2508.08717v1)

Open AccessDOI ↗PDF ↗

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Unavailability of experimental 3D structural data on protein folding dynamics and necessity for a new generation of structure prediction methods in this context

Aydin Wells, Khalique Newaz, Jennifer Morones et al. (2025) · arXiv (2507.08188v2)

Open AccessDOI ↗PDF ↗

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Protein folding classes -- High-dimensional geometry of amino acid composition space revisited

Boryeu Mao (2025) · arXiv (2506.01857v5)

Open AccessPDF ↗

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The effect of stereochemical constraints on the structural properties of folded proteins

Jack A. Logan, Jacob Sumner, Alex T. Grigas et al. (2025) · arXiv (2501.02424v2)

Open AccessDOI ↗PDF ↗

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A Survey of Deep Learning Methods in Protein Bioinformatics and its Impact on Protein Design

Weihang Dai (2025) · arXiv (2501.01477v1)

Open AccessPDF ↗

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Sequence-Augmented SE(3)-Flow Matching For Conditional Protein Backbone Generation

Guillaume Huguet, James Vuckovic, Kilian Fatras et al. (2024) · arXiv (2405.20313v2)

Open AccessPDF ↗

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Detection and prebiotic chemistry of possible glycine precursor molecule methylenimine towards the hot molecular core G10.47+0.03

Arijit Manna, Sabyasachi Pal (2024) · arXiv (2404.12212v1)

Open AccessDOI ↗PDF ↗

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Bacterial cell death: Atomistic simulations reveal pore formation as a mode of action of structurally nano engineered star peptide polymers

Amal Jayawardena, Andrew Hung, Greg Qiao et al. (2024) · arXiv (2404.02501v3)

Open AccessPDF ↗

The question of the cyclization of 3-{(2-carboxyethyl)-3-[bis(2-carboxyethyl)amino]anilino}propanoic acid

V. Novikovaite, Z. I. Beresnevicius, G. Mikulskiene (2007) · Chemistry of Heterocyclic Compounds

Cytowania: 3$ 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-Cystine dihydrochloride · 30925-07-6 · L-Cystine, dihydrochloride · cystine dihydrochloride · L-Cystine HCl · WFN1A47EIG · EINECS 250-391-9 · L-CYSTINE, HYDROCHLORIDE (1:2) · RefChem:581401 · DTXCID401765572 · 250-391-9 · L-CYSTINE 2HCL · MFCD00070399 · L-Cystine (dihydrochloride) · L-Cystine (hydrochloride)

数据来源

📊 PubChem CID 21121987 — NIH
🔬 NIST WebBook — spektroskopia
💊 ChEMBL — bioaktywność

在商店购买

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