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Irgacure 369

Manufactured by Novartis

Irgacure 369 is a photoinitiator used in the curing of various photopolymerizable systems. It is a highly efficient type I photoinitiator that absorbs in the UV-A and visible light regions. Irgacure 369 is commonly used in applications such as coatings, inks, and adhesives.

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3 protocols using irgacure 369

1

Fabrication of Liquid Crystal Elastomer Fibers

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1,3PDT (>99%), (3-aminopropyl)triethoxysilane (99%), butylhydroxytoluene (BHT; analytical standard), 1,8-diazabicyclo[5.4.0]undec-7-ene (98%), dichloromethane (DCM; anhydrous, ≥ 99.8%), N,N-dimethyl-n-octadecyl-3-aminopropyltrimethoxtsilyl chloride (42 wt% in methanol), 2,2-dimethoxy-2-phenylacetophenone (DMPA; 99%), poly(vinyl alcohol) (cold water soluble, molecular weight of 31,000 to 50,000, 98 to 99% hydrolyzed) were purchased from Sigma-Aldrich. Hydrochloric acid (HCl; certified ACS Plus, 36.5 to 38.0%), magnesium sulfate (anhydrous powder) (MgSO4), and tetrahydrofuran (high-performance liquid chromatography grade) were purchased from Thermo Fisher Scientific. RM82 and RM257 were purchased from Wilshire Technologies. 5CB were purchased from Tokyo Chemical Industry. NOA63 was purchased from Noland Optical Adhesive. SilcPigTM was purchased from Smooth-On. Photoinitiator, Irgacure 369, was purchased from Ciba. All chemicals were used as received. PTFE tubing for templating LCE fiber was purchased from Cole-Parmer.
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2

Preparing Liquid Crystal Polymer Films with Enhanced UV Stability

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RM82 (Mw = 120,000, Sigma Aldrich) and Irgacure369 (provided
by Ciba, Basel, Switzerland) were used as the nematic reactive mesogen
and photoinitiator, respectively. Also, silane-coated rutile TiO2
nanoparticles (SSNANO Co., Ltd.) with an average size of 20 nm were
selected as an inorganic UV-light absorber. Meanwhile, to carry out
the studies as accurately as possible, the TiO2 nanoparticles were
mixed with Tinuvin460 (BASF) as an organic UV-light absorber, which
has already been studied25 (link) in specific
weight percentages as listed in Table. 1. These materials cause a low glass transition temperature
(Tg) in the respective LCN polymer films.23 (link),24 (link) It is also noteworthy that, further, polyimide X610-33C (JNC Corporation,
Tokyo, Japan) and polyimide SE-5662 (Nissan) were employed to create
surface alignment layers with planar and homeotropic molecular orientations,
respectively, to achieve a splay molecular orientation in the LCN
polymer matrix.
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3

Synthesis of Acryloyl-Based Compounds

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2-Methyl-1,4-phenylene bis(4-(3-(acryloyloxy)propoxy)benzoate)
[RM 257] (1) and 4-methoxyphenyl 4-((6-(acryloyloxy)hexyl)oxy)benzoate
[RM 105] (2) were obtained from Merck. 4-((6-(Acryloyloxy)hexyl)oxy)benzoic
acid (3) and 4-((6-(acryloyloxy)hexyl)oxy)-2-methylbenzoic
acid (4) were purchased from Synthon. Irgacure 369 (6) was purchased from CIBA. Chiral dopant (R)-(+)-3-methyladipic acid (5) and dimethylmethylphosphonate
(7) were from Sigma-Aldrich, as well as trimethylamine
and diisopropylamine. Solvents tetrahydrofuran and toluene were purchased
from Biosolve, and acetone was purchased from Sigma-Aldrich.
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