Coating on Plastics

Schulz, Ulrike

doi:10.1002/9783527635443.ch6

Cited by 2 publications

(3 citation statements)

References 137 publications

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“…The VUV emission of plasma significantly degrades the PMMA. Photons of energy~8.5 eV (145 nm) can split off the methyl ester group, whereas the main polymer chain breaks at higher energy [26]. Kääriäinen et al [27] observed that PMMA samples pre-coated with 33 nm Al 2 O 3 or 55 nm TiO 2 layer deposited by thermal ALD processes show better adhesion of sputtered Ti coatings and less deviation in the attenuated total reflection-Fourier transform infrared (ATR-FTIR) absorption spectra than the untreated (bare) PMMA upon plasma exposure.…”

Section: Development Of Ald Processes On Pmma Substratementioning

confidence: 99%

“…The spectral response before and after the UV exposure (see Figure 6) confirm the UV stability of ALD coatings on PMMA. The results of UV stability may rely on the fact of partial or complete absorption of UV radiation by the dielectric coatings, whereas bare PMMA starts degrading under UV radiation [26].…”

Section: Environmental Durability and Mechanical Stabilitymentioning

confidence: 99%

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Antireflection Coating on PMMA Substrates by Atomic Layer Deposition

2020

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Antireflection coatings (ARC) are essential for various optical components including such made of plastics for high volume applications. However, precision coatings on plastics are rather challenging due to typically low adhesion of the coating to the substrate. In this work, optimization of the atomic layer deposition (ALD) processes towards conformal optical thin films of Al2O3, TiO2 and SiO2 on poly(methyl methacrylate) (PMMA) has been carried out and a five-layer ARC is demonstrated. While the uncoated PMMA substrates have a reflectance of nearly 8% in the visible (VIS) spectral range, this is reduced below 1.2% for the spectral range of 420–670 nm by applying a double-side ARC. The total average reflectance is 0.7%. The optimized ALD coatings show a good adhesion to the PMMA substrates even after the climate test. Microscopic analysis on the cross-hatch areas on PMMA after the climate test indicates very good environmental stability of the ALD coatings. These results enable a possible route by ALD to deposit uniform, crack free, adhesive and environmentally durable thin film layers on sensitive thermoplastics like PMMA.

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Section: Development Of Ald Processes On Pmma Substratementioning

confidence: 99%

Section: Environmental Durability and Mechanical Stabilitymentioning

confidence: 99%

Antireflection Coating on PMMA Substrates by Atomic Layer Deposition

2020

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“…Especially when the coated lens is used over a broad temperature regime, the mismatch in the thermal expansion coefficient of lens and layer materials may lead to stress cracking. In particular, this problem has an enormous importance on solid polymer lenses, so that, at present, most plastic optics are used uncoated [8]. Due to the mechanically nonelastic properties of inorganic coatings, the lack of suitable AR layers becomes even more crucial for tunable lenses that exploit flexible membrane surfaces.…”

Section: Introductionmentioning

confidence: 99%

Antireflective “moth-eye” structures on tunable optical silicone membranes

et al. 2012

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Flexible silicone membranes are key components for tunable optical lenses. The elastic operation of the membranes impedes the use of classical layer systems for an antireflective (AR) effect. To overcome this limitation, we equipped optical elastomer membranes with "moth-eye" structures directly in the flexible silicone substrate. The manufacturing of the AR structures in the flexible membrane includes a mastering process based on block copolymer micelle nanolithography followed by a replication method. We investigate the performance of the resulting AR structures under strain of up to 20% membrane expansion. A significant transmittance enhancement of up to 2.5% is achieved over the entire visible spectrum, which means that more than half of the surface reflection losses are compensated by the AR structures.

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Coating on Plastics

Cited by 2 publications

References 137 publications

Antireflection Coating on PMMA Substrates by Atomic Layer Deposition

Antireflection Coating on PMMA Substrates by Atomic Layer Deposition

Antireflective “moth-eye” structures on tunable optical silicone membranes

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