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The Effect of Reactive Aromatic Hyperbranched Polyester on the Properties of Unsaturated polyester
Kim, Jang-Yup,Huh, Wansoo 한국공업화학회 2005 응용화학 Vol.9 No.1
The aim of this study was to improve the toughness of UPE resin by using an aromatic hyperbranched polyester. The aromatic hyperbranched polyester(HBP) was synthesized and the end-group of the polymer was modified to methacrylate-terminated hyperbranched polyester.(MA-HBP) We characterized HBP and the resulting MA-HBP using ¹H-NMR and DSC. MA-HBP, up to 5 phr, was blended with UPE. The glass transition temperature was not affected by the addtion of MA-HBP, but the thermal stabilities of UPE blended with MA-HBP increased. It was found that the fracture toughness of UPE blended with MA-HBP increased by about 25%, as MA-HBP was added up to 3 phr. It slightly decreased with the further addition of MA-HBP to 5 phr.
Effect of Comonomer Distribution of LLDPE on Crystallization and Morphology of HDPE / LLDPE Blends
Lee, Soo Yeol,Jho, Jae Young,Huh, Wansoo 한국공업화학회 1998 Journal of Industrial and Engineering Chemistry Vol.4 No.3
Linear low density polyethylenes (LLDPE) prepared by Ziegler-Natta catalyst (ZNLLD) and LLDPE by metallocene catalyst (MLLD) were respectively blended with high density polyethylene (HDPE), and the effect of the comonomer distribution on the crystallization behavior and morphology was studied. ZNLLD cocrystallized with HDPE in a wider range of blend compositions and with a smaller amount of separate-crystallized LLDPE than MLLD did. The result was considered to be due to the fact that MLLD had more even comonomer distribution than ZNLLD had. The etched-surface morphology exhibited that banded spherulites were more uniformly formed when cocrystallization only occurred. The non-uniform morphology appeared to be due to the mixed stacking of cocrystals and separate-crystals.
Discontinuous pn-Heterojunction for Organic Thin Film Transistors
Cho, Boeun,Yu, Seong Hun,Kim, Minwoo,Lee, Moo Hyung,Huh, Wansoo,Lee, Jiyoul,Kim, Jungwook,Cho, Jeong Ho,Lee, Jun Young,Song, Young Jae,Kang, Moon Sung American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.31
<P>Utilization of discontinuous pn-oragnic heterojunction is introduced as a versatile method to improve charge transport in organic thin film transistors (OTFTs). The method is demonstrated by depositing n-type dioctyl perylene tetracarboxylic diimide (PTCDI-C<SUB>8</SUB>) discontinuously onto base p-type pentacene OTFTs. A more pronounced impact of the discontinuous upper layer is obtained on the transistor performances when thinner base layers are employed; a >100-fold enhancement in hole mobility and a >20 V shift in threshold voltage are achieved after applying PTCDI-C<SUB>8</SUB> discontinuously onto 2 nm thick pentacene thin films. Local surface potential measurements (Kelvin-probe force microscopy) and temperature-dependent transport measurements (77–300 K) reveal that the interfacial dipole formed at the pn-heterostructures effectively dopes the base pentacene films p-type and leads to a reduction in transport activation energy.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-31/jp504114f/production/images/medium/jp-2014-04114f_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp504114f'>ACS Electronic Supporting Info</A></P>
Ko, Youngpyo,Oh, Jinwoo,Park, Kyung Tae,Kim, Soojin,Huh, Wansoo,Sung, Bong June,Lim, Jung Ah,Lee, Sang-Soo,Kim, Heesuk American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.40
<P>As practical interest in stretchable electronics increases for future applications in wearables, healthcare, and robotics, the demand for electrical interconnects with high electrical conductivity, durability, printability, and adhesion is growing. Despite the high electrical conductivity and stretchability of most previous interconnects, they lack stable conductivity against strain and adhesion to stretchable substrates, leading to a limitation for their practical applications. Herein, we propose a stretchable conductive adhesive consisting of silver particles with carbon nanotube as an auxiliary filler in silicone adhesives. The conductive adhesive exhibits a high initial conductivity of 6450 S cm<SUP>-1</SUP>. They show little change in conductivity over 3000 stretching cycles at 50% strain, currently the highest stability reported for elastic conductors. Based on strong adhesion to stretchable substrates, the gel-free, dry adhesives printed on an elastic bandage for electrocardiography monitoring exhibit an extremely stable performance upon movement of the subject, even after several cycles of detachment-reattachment and machine washing.</P> [FIG OMISSION]</BR>