NTEA is a sulfur-rich acrylic monomer engineered for high-refractive-index (RI ≥ 1.65 @ 589 nm, 25 °C) UV/LED-curable optical systems.
The naphthalene–thio-ether conjugation delivers n<sub><sup> ≈ 1.66 while maintaining Abbe number ≈ 27, ideal for thin-film microlenses, AR/VR pancake optics, waveguide claddings, and high-n encapsulants.
Single acrylate functionality provides low shrinkage (< 2 %) and fast surface-through cure with standard Type I photoinitiators (TPO, 1173).
Key Optical & Physical Data:
Refractive index (n<sub><sup>): 1.655 – 1.665
Abbe number (ν<sub>): 27 ± 1
Density: 1.18 g cm⁻³ (20 °C)
Viscosity (25 °C): 60 – 70 mPa·s (easy pumping & coating)
Volume shrinkage on cure: < 2 % (density dilatometry)
Glass-transition temperature (DSC, 2 % TPO): 140 °C
2-(2-Naphthalenylthio)ethyl acrylate
Alias:2-Naphthylthioethyl acrylate
Cas:897049-32-0
Purity: ≥ 98 % (GC)
Molecular Formula: C₁₅H₁₄O₂S
Appearance: Colourless to light-yellow transparent liquid; almost odourless
Refractive Index:1.65
