Finely Formed, Kinetically Modulated Wrinkle Structures in UV-Crosslinkable Liquid Prepolymers.
Special characteristics of wrinkles such as a scattering source and a high surface area are finding use in high-tech applications. UV-crosslinkable prepolymers are occasionally used for fabricating wrinkled films. Wavelength of the wrinkles formed from the prepolymers is several tens and hundreds of micrometers. Here, a UV-crosslinkable liquid prepolymer is synthesized to spontaneously form wrinkle structures in the order of several micrometers. Double layers with a very thin hard skin and a soft and contractible foundation are formed at the same time, by ensuring that all the absorbance wavelengths of the photoinitiator are shorter than the minimum wavelength at which the prepolymer is transparent. The rate of photo-crosslinking reaction, R(p), is also found to affect the thickness of the skin and foundation layers at the early UV-curing stage. The first-order apparent rate constant, k(app), is between ≈0.20 and ≈0.69 s(-1) for the wrinkle formation. This wrinkle structures can be simply modulated by changing R(p).
Soft I/O Interface Research Section, Smart I/O Platform Research Department, Information & Communications Core Technology Research Laboratory, Electronics and Telecommunications Research Institute, 218 Gajeongno, Yuseong-gu, Daejeon, 34129, South Korea.
Seung Koo
SK
Park
Department of Organic Materials and Fiber Engineering, Soongsil University, 369 Sangdoro, Dongjak-gu, Seoul, 06978, South Korea.
Young-Je
YJ
Kwark
Soft I/O Interface Research Section, Smart I/O Platform Research Department, Information & Communications Core Technology Research Laboratory, Electronics and Telecommunications Research Institute, 218 Gajeongno, Yuseong-gu, Daejeon, 34129, South Korea.
Jaehyun
J
Moon
Soft I/O Interface Research Section, Smart I/O Platform Research Department, Information & Communications Core Technology Research Laboratory, Electronics and Telecommunications Research Institute, 218 Gajeongno, Yuseong-gu, Daejeon, 34129, South Korea.
Chul Woong
CW
Joo
Soft I/O Interface Research Section, Smart I/O Platform Research Department, Information & Communications Core Technology Research Laboratory, Electronics and Telecommunications Research Institute, 218 Gajeongno, Yuseong-gu, Daejeon, 34129, South Korea.
Byounggon
B
Yu
Soft I/O Interface Research Section, Smart I/O Platform Research Department, Information & Communications Core Technology Research Laboratory, Electronics and Telecommunications Research Institute, 218 Gajeongno, Yuseong-gu, Daejeon, 34129, South Korea.
Jeong-Ik
JI
Lee
D005026:Ethylene Glycols / Q000737:chemistry*; D007700:Kinetics; D058105:Polymerization; D011407:Propane / Q000031:analogs & derivatives*; D015595:Skin Aging; D017768:Skin, Artificial; D014466:Ultraviolet Rays
D005026:Ethylene Glycols; D011407:Propane
double layers; liquid prepolymers; photoinitiators; photopolymerization kinetics; wrinkled films