Application of a new model and measurement technique for dynamic shrinkage and conversion of multi-acrylates photopolymerized at different UV intensities

Neo, Wee Koon; Chan‐Park, Mary B.

doi:10.1016/j.polymer.2007.03.020

Cited by 10 publications

(6 citation statements)

References 12 publications

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“…This value agrees with the previously reported shrinkage of UV-curable resin. 17) However, the utilization of pentafluoropropane as the ambient gas resulted in a more reduced pattern height compared with the original depth of the mold recesses; also, in this case, the pattern shrinkage reached 22%. This high degree of shrinkage seemed to exceed the resin shrinkage reported previously in an air environment.…”

Section: Resultsmentioning

confidence: 95%

Effects of Environmental Gas in UV Nanoimprint on the Characteristics of UV-Curable Resin

Wang

Hiroshima

2010

Jpn. J. Appl. Phys.

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In this study we investigated the effects of ambient gas on the characteristics of UV-curable resin in UV nanoimprint process by comparing the pattern transfer fidelity and residual layer thicknesses of the samples carried out in air and pentafluoropropane gas. We found that the resin pattern shrinkage induced by UV exposure was markedly affected by the ambient gas environment. The pattern shrinkage reached 22% in pentafluoropropane, while it reached only 3% in air. Also, the effects of pentafluoropropane on residual layer thickness were investigated. It was found that the residual layer using pentafluoropropane was much thinner than could be expected from the shrinkage induced by pentafluoropropane alone. We believe that the thinning of the residual layer is caused not only by shrinkage, but also by a decrease in the viscosity of UV-curable resin.

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Section: Resultsmentioning

confidence: 95%

Effects of Environmental Gas in UV Nanoimprint on the Characteristics of UV-Curable Resin

Wang

Hiroshima

2010

Jpn. J. Appl. Phys.

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“…Because of the necessary movement of the experimental setup, only unpolymerized samples were measured. The results are assumed valid for the polymerized case as well, due to a coating shrinkage of only 5–8% after polymerization in comparable formulations,14 which will be neglected. The clear coating showed a signal change from 4 mm coating thickness downwards, whereas a signal change of the TiO 2 pigmented formulations started at 2 mm.…”

Section: Resultsmentioning

confidence: 99%

NIR‐laser based detection of the photopolymerization state of acrylate coatings suitable for in situ measurements

Bach

Heering

2011

J of Applied Polymer Sci

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The present article describes a method for the determination of the radical photopolymerization conversion of acrylic coatings suitable for an in situ monitoring during the coating process. Acrylate based coatings are increasingly used in many kinds of industrial coating processes, because of advantages of the solvent-free application process. The applied method is based on 1620 nm light absorption of the acrylate. To overcome the disadvantages of a common NIR spectrometer, only the diffuse reflection of the relevant discrete wavelength at 1620 nm and of a reference wavelength is measured. A sophisticated sensor setup including an optical spatial filter and lock-in amplified signal processing is used to achieve a sufficient signal to noise ratio. The capability of the sensor to discriminate between polymerized and unpolymerized coatings on metal substrates down to a coating thickness of 16 lm is demonstrated. Furthermore, the information on polymerization from larger depth in TiO 2 pigmented coatings is investigated. The results can be analytically modeled in analogy to the Lambert-Beer's law, resulting in a detection limit of a maximum pigment concentration of 15 wt % with 100 lm coating thickness. The presented sensor design is suitable to be used in an industrial production environment for example in screen printing applications as a monitoring and quality control tool.

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“…Weng等人 [19] [21] 研究了黏度、壁面滑移和表面张力等尺度依赖的参数对材料充型的影响, 发现当流道尺寸在几微米或者更小时总会出现壁面滑移现象. Tian等人 [22] 此外, Neo和Park [25] 进一步完善了模型来描述紫外光固化过程中的单体转化. 在材料收缩方面, Horiba等人 [26] 采用转移函数估计了UV固化成形中材料收缩导致的微细特征相对临界尺寸误差, 提出了模具修正方法以补偿光学薄膜微细特征的收缩 .…”

Section: 残余层是充型过程中的另一类缺陷对光线吸unclassified

Recent progress in fabrication methods for micro structures on optical thin film

Peng

Lai

2015

Chin. Sci. Bull.

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Application of a new model and measurement technique for dynamic shrinkage and conversion of multi-acrylates photopolymerized at different UV intensities

Cited by 10 publications

References 12 publications

Effects of Environmental Gas in UV Nanoimprint on the Characteristics of UV-Curable Resin

Effects of Environmental Gas in UV Nanoimprint on the Characteristics of UV-Curable Resin

NIR‐laser based detection of the photopolymerization state of acrylate coatings suitable for in situ measurements

Recent progress in fabrication methods for micro structures on optical thin film

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