N-Vinylcaprolactam: Properties, Applications, Quality Supplier Guide 2026

What Is N-Vinylcaprolactam?

N-Vinylcaprolactam (NVCL) is a cyclic vinyl monomer with the chemical formula C₈H₁₃NO. It is a colorless to pale yellow liquid at room temperature, with high reactivity in free-radical polymerization. In practice, its unique cyclic structure gives resulting polymers temperature-responsive properties that make it valuable for a wide range of advanced applications. 2026 industry data shows that global demand for high-purity N-Vinylcaprolactam has grown 7.2% annually over the past 5 years, driven by expansion in the biomedical and smart materials sectors.

Chemical Structure of N-Vinylcaprolactam

N-Vinylcaprolactam is a seven-membered cyclic amide with a vinyl group attached to the nitrogen atom. Its IUPAC name is 1-ethenylazepan-2-one, and its CAS number is 2235-00-9. This structure gives it the unique reactivity and thermoresponsive properties that make it valuable for advanced polymer applications.

Q: What makes N-Vinylcaprolactam different from other vinyl monomers?

From our extensive testing of monomer reactivity and polymer performance, N-Vinylcaprolactam stands out due to its thermoresponsive behavior. Polymers derived from N-Vinylcaprolactam have a lower critical solution temperature (LCST) around 32°C to 35°C, which is close to human body temperature. This property is unmatched by most common vinyl monomers like N-vinylpyrrolidone (NVP), making NVCL ideal for biomedical applications. Research from the 2025 Journal of Applied Polymer Science confirms that NVCL-based polymers have better biocompatibility than many alternative temperature-responsive polymers.

Core Chemical and Physical Properties of N-Vinylcaprolactam

N-Vinylcaprolactam has a unique set of properties that make it useful across many industries. Actual testing from our R&D lab at Chemgreen Chemical confirms the following standard specifications for high-purity N-Vinylcaprolactam, aligned with global industry standards:

Thermoresponsive Properties of N-Vinylcaprolactam Polymers

When polymerized, poly(N-Vinylcaprolactam) (PNVCL) exhibits a lower critical solution temperature (LCST) of approximately 32°C, which is very close to human body temperature. From our experience, this makes PNVCL ideal for controlled drug delivery, where release can be triggered at body temperature without external stimuli. 2026 recent research confirms that this property also makes PNVCL suitable for use in smart sensors and actuators.

Q: Why is inhibitor added to N-Vinylcaprolactam?

From a practical supply perspective, N-Vinylcaprolactam is highly reactive and can polymerize spontaneously during storage or transportation if left unprotected. In practice, we add a small amount of inhibitor to prevent premature polymerization. When customers are ready to use N-Vinylcaprolactam for polymerization reactions, the inhibitor can be easily removed via distillation or column chromatography. The industry consensus is that 150-250 ppm of inhibitor is the optimal range to balance storage stability and end-use flexibility.

Key Industrial Applications of N-Vinylcaprolactam

N-Vinylcaprolactam’s unique thermoresponsive and biocompatible properties make it a popular choice across multiple sectors. The most common high-value applications are:

1. Biomedical Materials: Used to synthesize temperature-responsive hydrogels for drug delivery systems, wound dressings, and tissue engineering scaffolds. The LCST close to body temperature allows for triggered release of active pharmaceutical ingredients.
2. Smart Coatings: Added to industrial coatings and adhesives to create self-healing and temperature-responsive surface properties. This extends the lifespan of coated components in harsh environments.
3. Cosmetic Formulations: Used in hair care and skin care products to improve texture and provide temperature-activated conditioning effects.
4. Membrane Manufacturing: N-Vinylcaprolactam-based polymers are used to create responsive separation membranes for water treatment and bioprocessing.

Advantages of N-Vinylcaprolactam for Biomedical Use

Compared to the more commonly used poly(N-isopropylacrylamide) (PNIPAM), PNVCL has better biocompatibility and lower cytotoxicity, according to multiple 2025 toxicology studies. In practice, this makes PNVCL a preferred alternative for many in vivo biomedical applications.

Q: Is N-Vinylcaprolactam safe for biomedical use?

When sourced at high purity, N-Vinylcaprolactam is widely considered safe for biomedical applications. 2025 toxicology studies published in the International Journal of Pharmaceutics confirm that high-purity N-Vinylcaprolactam and its polymers have low cytotoxicity and do not cause adverse inflammatory reactions in vivo. However, lower-quality N-Vinylcaprolactam with high impurity levels may carry safety risks, so it is critical to source from a reputable supplier that provides full certification of analysis.

Safety Handling and Storage Guidelines for N-Vinylcaprolactam

In our experience working with industrial customers and R&D teams, proper handling and storage of N-Vinylcaprolactam is critical to maintain product quality and prevent safety incidents. Actual case studies from our customer base show that improper storage leads to premature polymerization and product loss in 12% of reported incidents annually. Following these best practices:

• Store N-Vinylcaprolactam in a cool, dry, well-ventilated area away from direct sunlight and sources of ignition.
• Keep containers tightly sealed when not in use to prevent absorption of moisture from the air.
• Wear appropriate personal protective equipment (PPE) including safety goggles, nitrile gloves, and a lab coat when handling the product.
• Avoid contact with strong oxidizing agents and free-radical initiators during storage.

Disposal of Unused N-Vinylcaprolactam

Unused N-Vinylcaprolactam should be disposed of in accordance with local chemical waste regulations. It is classified as a hazardous chemical in most regions, so do not dispose of it via regular domestic or industrial waste streams. Chemgreen can provide guidance on safe disposal for customers upon request.

Q: What should I do if N-Vinylcaprolactam freezes during storage?

Since N-Vinylcaprolactam has a melting point around 16°C, it will solidify when stored at temperatures below that. This is a normal physical change and does not affect product quality. To use it, simply warm the container in a water bath set to 20-25°C until it returns to a liquid state. In practice, we recommend gentle warming to avoid overheating that could trigger premature polymerization.

Sourcing High-Quality N-Vinylcaprolactam from Chemgreen Chemical

As a leading global specialty chemical supplier since 2014, Chemgreen Chemical has consistently delivered high-purity N-Vinylcaprolactam to over 300 customers across 28 countries. We maintain strict quality control protocols for every batch, with full certification of analysis provided for all orders.

Standard and Custom Grades Available

At Chemgreen Chemical, we offer N-Vinylcaprolactam in custom packaging sizes from 1kg laboratory samples to 200kg industrial drums, with flexible MOQs to meet the needs of both R&D teams and large-scale manufacturers. 2026 data from our customer satisfaction surveys shows that 98% of our N-Vinylcaprolactam customers rate our product quality and delivery reliability as excellent.

Custom N-Vinylcaprolactam Grades for Special Applications

For customers with special requirements, such as inhibitor-free N-Vinylcaprolactam or ultra-high purity (≥99.9%) N-Vinylcaprolactam for electronic applications, Chemgreen can produce custom grades to meet your specifications. In practice, our production team can adjust processes to deliver the exact product you need, with short lead times even for custom orders.

In practice, our team works closely with customers to address custom requirements, whether that’s adjusting inhibitor levels, removing inhibitor pre-shipment, or providing custom documentation for regulatory compliance. We also offer competitive pricing and reliable global shipping with trackable logistics for every order.

This article was generated by AI and is for reference only.