Results 81 to 90 of about 11,202 (203)

Dielectric response of polymer films confined between mica surfaces [PDF]

open access: yes, 2014
The thin-film dielectric response of organic films confined within a surface forces apparatus (SFA) and also between parallel sheets of atomically smooth mica is reported for the first time.
Cho, Yoon-Kyoung   +2 more
core   +1 more source

Production of functionalized oligo‐isoprenoids by enzymatic cleavage of rubber

open access: yesMicrobial Biotechnology, 2017
Summary In this study, we show the proof of concept for the production of defined oligo‐isoprenoids with terminal functional groups that can be used as starting materials for various purposes including the synthesis of isoprenoid‐based plastics.
Wolf Röther   +4 more
doaj   +1 more source

Molecular Dynamics of Polyisoprene/Polystyrene Oligomer Blends: The role of self-concentration and fluctuations on blend dynamics [PDF]

open access: yes, 2013
The effect of self-concentration and intermolecular packing on the dynamics of polyisoprene (PI)/polystyrene (PS) blends is examined by extensive atomistic simulations.
Doxastakis, Manolis   +1 more
core   +1 more source

Structural characterization of the Fddd phase in a diblock copolymer thin film by electron microtomography [PDF]

open access: yes
A 3-dimensional Fddd network structure of a polystyrene-block-polyisoprene (PS-b-PI) diblock copolymer (M(n) = 31 500, f(PI) = 0.645) was observed for the first time in real space by transmission electron microtomography (TEMT). In a 650 nm thick film of
CHANG, TAIHYUN   +8 more
core   +1 more source

Failure of classical elasticity in auxetic foams

open access: yes, 2012
A recent derivation [P.H. Mott and C.M. Roland, Phys. Rev. B 80, 132104 (2009).] of the bounds on Poisson's ratio, v, for linearly elastic materials showed that the conventional lower limit, -1, is wrong, and that v cannot be less than 0.2 for classical ...
Giller, C. B.   +3 more
core  

Phase separation phenomena during the formation of asymmetric membranes [PDF]

open access: yes, 1977
The formation of membranes from two systems has been studied. In the system polyurethane-dimethylformamide-water, the mechanism for the formation of the sponge-like structure proves to be a liquid-liquid phase separation with nucleation and growth of the
Koenhen, D.M.   +2 more
core   +4 more sources

Impregnation of Natural Rubber into Rubber Wood: A Green Wood Composite

open access: yesBioResources, 2014
A green wood composite material was developed from the two environmentally friendly substrates natural rubber (cis-1,4-polyisoprene) and rubber wood (Hevea brasiliensis).
Wassa Ruayruay, Sureurg Khongtong
doaj   +1 more source

Equation of State Based Slip Spring Model for Entangled Polymer Dynamics

open access: yes, 2017
A mesoscopic, mixed particle- and field-based Brownian dynamics methodology for the simulation of entangled polymer melts has been developed. Polymeric beads consist of several Kuhn segments, and their motion is dictated by the Helmholtz energy of the ...
Megariotis, Grigorios   +2 more
core   +1 more source

"Preparation and performance of irradiated crosslinked medical polyisoprene rubber"

open access: yesHecheng xiangjiao gongye
Trimethylolpropane triacrylate(TMPTA)/polyisoprene rubber (IR) and tetramethylolpropane tetraacrylate (PET 4 A)/IR composites were prepared by γ-ray irradiation with IR as matrix, TMPTA and PET 4 A as sensitizers, and the sensitization effect of ...
CUI Kai-wen1, XUAN Lu-jia1, MA Pei-dong2, JIANG Sheng-nan1, WANG Hong-zhen1
doaj   +1 more source

SEC-MALS characterization of natural rubber: Study of phenomena behind the abnormal elution profile [PDF]

open access: yes, 2008
Natura/ and synthetic poly(cis-1,4-isoprene) were characterized by size exclusion chromatography coupled with an online multiangle light scattering detector (SEC-MALS) (Fig. 1).
Kim, Chandy   +4 more
core  

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