Cardanol acylationomics testing service

Cardanol Acylationomics Testing Service – Comprehensive Chemical Profiling and Quality Control for Acylated Cardanol Derivatives

As an ISO/IEC 17025 accredited independent testing laboratory, we offer specialised acylationomics testing services for cardanol and its acylated derivatives, serving Bulgarian and international manufacturers, research institutions, and industrial users in the coatings, lubricants, surfactants, and polymer sectors. Cardanol – a renewable phenolic lipid derived from cashew nutshell liquid (CNSL) – exhibits valuable properties such as hydrophobicity, thermal stability, and chemical reactivity. Acylation of cardanol (e.g., with acetic, maleic, or acrylic anhydrides) introduces ester or amide functionalities that can enhance performance as plasticisers, corrosion inhibitors, or resin precursors. However, the quality, composition, and consistency of acylated cardanol products depend critically on the degree of acylation, isomer distribution, residual raw materials, and side‑product formation. Our acylationomics platform combines advanced chromatographic, spectroscopic, and mass spectrometric techniques to provide a comprehensive characterisation of acylated cardanol mixtures. All methods are aligned with ASTM, ISO, and BDS standards, and our reports are recognised by the Bulgarian Institute for Standardisation (BDS), the Executive Agency for Metrological and Technical Surveillance (IAМТН), and leading chemical and materials enterprises in Bulgaria and the EU.

Cardanol and Acylated Derivative Samples We Test

Our laboratory accommodates a wide range of cardanol-based materials and intermediates. Typical test articles include:

• Technical cardanol – distilled, hydrogenated, or purified grades (monomer and oligomer mixtures)
• Acetylated cardanol (cardanol acetate) – for applications as a low‑temperature plasticiser
• Maleated cardanol – for reactive diluents in epoxy and alkyd resins
• Acrylated cardanol – for UV‑curable coatings and adhesives
• Succinylated, phthalated, and other organic acid derivatives – for lubricant additives and metalworking fluids
• Esterified and amidated cardanol derivatives – for surfactant and biocide formulations
• Process intermediates and crude reaction mixtures – for reaction monitoring and process optimisation
• Formulated products containing acylated cardanol – for final product quality verification

Chemical Composition Analysis – Identification and Quantification of Components

• Gas Chromatography with Flame Ionisation and Mass Spectrometry (GC‑FID/MS) – ISO 12966 / ASTM D6584 – We separate and quantify the individual cardanol mono‑, di‑, and tri‑enyl phenols (the natural components) and their acylated derivatives. The chromatographic profile reveals the degree of acylation (the percentage of hydroxyl groups esterified) and the presence of unreacted cardanol, residual anhydrides, and oligomeric by‑products. For Bulgarian industrial applications, a conversion rate ≥ 95 % is typically required for high‑purity acylated products.
• High‑Performance Liquid Chromatography (HPLC‑UV/ELSD) – ISO 1065 / ASTM E169 – For polar or thermally labile derivatives, we use reversed‑phase HPLC with UV detection (at 280 nm) or evaporative light scattering (ELSD) to quantify the main acylated components and to detect any cross‑linked or polymeric species. The method provides excellent resolution of positional isomers (e.g., ortho‑ and para‑acylation).
• Fourier‑Transform Infrared Spectroscopy (FTIR) – ASTM E1252 / ISO 19702 – We record the ATR‑FTIR spectra of cardanol and acylated samples to identify characteristic functional groups: the disappearance of the O‑H broad band (around 3300 cm⁻¹) and the appearance of ester C=O (≈1735 cm⁻¹) or amide bands (≈1650 cm⁻¹). The ratio of ester to phenol absorption is used as a quick indicator of acylation degree. Spectra are compared against a reference library to ensure consistency.
• Nuclear Magnetic Resonance Spectroscopy (¹H‑ and ¹³C‑NMR) – ASTM E386 / ISO 13553 – We perform quantitative NMR (qNMR) to determine the absolute degree of acylation by integrating the phenolic proton signal (δ 4.5‑5.5 ppm) and the ester‑linked alkyl protons. For acetylated cardanol, the integral of the acetyl methyl group (δ 2.0‑2.2 ppm) relative to the aromatic protons provides a precise conversion value. NMR also identifies the presence of unreacted anhydrides and residual solvents (e.g., toluene, ethyl acetate).
• Size‑Exclusion Chromatography (SEC) – for molecular weight distribution – For acylated cardanol that undergoes polymerisation or oligomerisation (e.g., during maleation), we use SEC with RI detection to determine the number‑average (Mn) and weight‑average (Mw) molecular weights, as well as the polydispersity index (PDI). This is critical for assessing whether the acylation process has caused unwanted cross‑linking.

Physicochemical Properties – Viscosity, Density, Acid Value and Colour

• Kinematic viscosity – ASTM D445 / ISO 3104 – We measure the viscosity of acylated cardanol at 40 °C and 100 °C using a capillary viscometer. Acylation generally increases viscosity; deviations from the expected range indicate incomplete reaction, contamination, or degradation.
• Density – ASTM D4052 / ISO 12185 – Using a digital density meter (oscillating U‑tube), we determine the density at 20 °C and 25 °C. Density values are used for quality control and for calculating the stoichiometry of formulations.
• Acid value (AV) – ASTM D664 / ISO 660 – The acid value indicates the amount of free acidic species (residual anhydrides or formed carboxyl groups). For acetylated cardanol, a low AV (< 1 mg KOH/g) is desirable; higher values suggest incomplete esterification or hydrolysis of the ester bonds. We perform potentiometric titration with KOH to obtain accurate AV.
• Hydroxyl value (OHV) – ASTM D1957 / ISO 4629 – The hydroxyl value quantifies the remaining free phenolic groups after acylation, and is inversely correlated with the degree of conversion. A low OHV (< 5 mg KOH/g) is expected for fully acylated products.
• Colour – Gardner scale – ASTM D1544 / ISO 4630 – We visually or spectrophotometrically compare the sample colour against the Gardner colour standards (1 to 18). Acylated cardanol typically should have a colour ≤ 8 Gardner for clear and pale applications.
• Moisture content – Karl Fischer titration – ASTM E203 / ISO 760 – Moisture can hydrolyse ester bonds during storage. We measure water content (in %) using coulometric or volumetric Karl Fischer titration; a content below 0.1 % is usually required for stable acylated products.

Purity and By‑Product Analysis – Detecting Impurities and Residual Anhydrides

• Residual anhydride content – GC‑MS / HPLC‑UV – We quantify unreacted acylating agents (e.g., acetic anhydride, maleic anhydride, acrylic anhydride) in the final product. For Bulgarian and European regulatory compliance, the residual anhydride content must be below 0.5 % to avoid corrosion or skin irritation issues.
• Free cardanol content – GC‑FID or HPLC – We measure the percentage of unreacted cardanol in the acylated product. A high level (> 5 %) indicates insufficient acylation and may affect product performance.
• Oligomeric and polymeric fractions – SEC‑RI – We determine the amount of higher molecular weight species (dimer, trimer, and higher oligomers) formed during acylation. For most applications, a dimer content < 10 % is acceptable; excessive oligomerisation may increase viscosity and reduce reactivity.
• Volatile organic compound (VOC) content – ISO 11890‑2 / ASTM D6886 – Using headspace GC‑MS, we measure the VOC level in the acylated product, which is important for environmental and health safety classifications.
• Trace metals (iron, copper, zinc) – ICP‑OES / ICP‑MS – We screen for metal ions that may have originated from catalysts or reactor corrosion, as they can catalyse oxidation and degrade product quality. Acceptable limits are typically < 10 ppm for each metal.

Thermal Stability and Reaction Monitoring – Optimising Acylation Processes

• Thermogravimetric Analysis (TGA) – ISO 11358 / ASTM E1131 – We measure the weight loss of acylated cardanol as a function of temperature (25‑600 °C) to determine thermal decomposition onset. For acetylated cardanol, an onset temperature above 250 °C is considered good; the presence of unreacted cardanol may lower the onset.
• Differential Scanning Calorimetry (DSC) – ISO 11357 / ASTM E1356 – We record the glass transition temperature (Tg) and, if any, the melting/crystallisation behaviour of acylated derivatives. Tg increases with the degree of acylation, and a narrow Tg range indicates a uniform product.
• Kinetic monitoring by in‑situ FTIR (for process development) – We offer real‑time FTIR monitoring of the acylation reaction in a lab‑scale reactor, tracking the decrease of the O‑H band and the increase of the ester C=O peak. This allows the determination of reaction order, activation energy, and optimal reaction time (to reach ≥ 95 % conversion).

Performance Testing – Evaluating Application‑Specific Properties

• Plasticising efficiency (for PVC and other polymers) – We test acylated cardanol as a plasticiser by compounding it with PVC and measuring the glass transition (by DSC) and mechanical properties (tensile strength, elongation). A good plasticiser lowers the Tg by > 20 °C.
• Corrosion inhibition efficiency (for metalworking fluids) – For acylated cardanol used as a corrosion inhibitor, we perform a salt spray test (ASTM B117) and electrochemical impedance spectroscopy (EIS) on coated metal panels to measure the protection factor.
• Lubricity performance (four‑ball test) – ASTM D4172 – For acylated cardanol as a lubricant additive, we measure the wear scar diameter (WSD) and coefficient of friction under standard loads and speeds.
• Emulsion stability (for surfactants) – ASTM D1131 / ISO 6614 – We evaluate the ability of acylated cardanol to stabilise oil‑water emulsions by measuring the demulsification time and the emulsion stability index.

Report Acceptance & Compliance with Bulgarian and European Chemical Standards

All acylationomics tests are performed under our ISO/IEC 17025 accreditation, with instruments calibrated traceable to BDS and international reference materials. Our final reports include a full description of the sample (type, origin, synthesis route), a summary of the analytical methods used, raw chromatograms/spectra with peak assignments, calculated parameters (degree of acylation, acid/hydroxyl value, viscosity, colour, thermal degradation onset), and a clear conformity statement against your specified specifications (e.g., conversion ≥ 95 %, acid value ≤ 1 mg KOH/g). Statistical evaluation (repeatability, reproducibility) and measurement uncertainty (k=2) are provided for key parameters. These reports are accepted by Bulgarian chemical manufacturers, research centres, and regulatory authorities (BDS, IAМТН) for quality assurance, process optimisation, and product registration. Bilingual (Bulgarian/English) versions are available for international submissions and collaborations.