Synthesis and properties of polyimide–clay hybrid Tập 31 Số 10 - Trang 2493-2498 - 1993
Kazuhisa Yano, Arimitsu Usuki, Akane Okada, Toshio Kurauchi, Osami Kamigaito
AbstractA polyimide hybrid with montmorillonite clay mineral has been
synthesized from a dimethylacetamide (DMAC) solution of poly(amic acid) and a
DMAC dispersion of montmorillonite intercalated with an ammonium salt of
dodecylamine. Montmorillonite consists of stacked silicate sheets about 2000 Å
in length, 10 Å in thickness. In this hybrid, montmorillonite is dispersed
homogeneously into the po... hiện toàn bộ
Thiol–enes: Chemistry of the past with promise for the future Tập 42 Số 21 - Trang 5301-5338 - 2004
Charles E. Hoyle, Tai Yeon Lee, Todd M. Roper
AbstractThe photopolymerization of mixtures of multifunctional thiols and enes
is an efficient method for the rapid production of films and thermoset plastics
with unprecedented physical and mechanical properties. One of the major
obstacles in traditional free‐radical photopolymerization is essentially
eliminated in thiol–ene polymerizations because the polymerization occurs in air
almost as rapid... hiện toàn bộ
Synthesis and barrier properties of poly(ε‐caprolactone)‐layered silicate nanocomposites Tập 33 Số 7 - Trang 1047-1057 - 1995
Phillip B. Messersmith, Emmanuel P. Giannelis
AbstractA new polymer‐ceramic nanocomposite has been synthesized consisting of
well‐dispersed, two‐dimensional layers of an organically modified mica‐type
silicate (MTS) within a degradable poly(ε‐caprolactone) matrix. A protonated
amino acid derivative of MTS was used to promote delamination/dispersion of the
host layers and initiate ring‐opening polymerization of ε‐caprolactone monomer,
resultin... hiện toàn bộ
Synthesis of nylon 6–clay hybrid by montmorillonite intercalated with ϵ‐caprolactam Tập 31 Số 4 - Trang 983-986 - 1993
Yoshitsugu Kojima, Arimitsu Usuki, Masaya Kawasumi, Akane Okada, Toshio Kurauchi, Osami Kamigaito
AbstractIt was found that montmorillonite was intercalated with ϵ‐caprolactam.
X‐ray diffraction revealed that the chain axes of the ϵ‐caprolactam were
parallel to the montmorillonite plates. The intercalated montmorillonite was
swollen by molten ϵ‐caprolactam at 200°C. ϵ‐Caprolactam and 6‐aminocaproic acid
(accelerator) were polymerized with the intercalated montmorillonite at 260°C
for 6 h, yiel... hiện toàn bộ
Discovery of dendrimers and dendritic polymers: A brief historical perspective* Tập 40 Số 16 - Trang 2719-2728 - 2002
Donald A. Tomalia, Jean M. J. Fréchet
AbstractA brief historical perspective relating the discovery of dendrimers and
other dendritic polymers is presented. Dendritic polymers are recognized as the
fourth major class of macromolecular architecture consisting of four sub‐
classes, namely, (1) random hyperbranched, (2) dendrigrafts, (3) dendrons, and
(4) dendrimers. The previous literature is reviewed with anecdotal events
leading to im... hiện toàn bộ
Mechanism and kinetics of the crosslinking reaction between biopolymers containing primary amine groups and genipin Tập 41 Số 24 - Trang 3941-3953 - 2003
Michael F. Butler, Yiu‐Fai Ng, Paul D. A. Pudney
AbstractThe reaction mechanism of chitosan, bovine serum albumin (BSA), and
gelatin with genipin (a natural crosslinking reagent) was examined with
infrared, ultraviolet–visible, and 13C NMR spectroscopies; protein‐transfer
reaction mass spectrometry; photon correlation spectroscopy; and dynamic
oscillatory rheometry. Two reactions that proceeded at different rates led to
the formation of crosslin... hiện toàn bộ
Physicochemical characterization of α‐chitin, β‐chitin, and γ‐chitin separated from natural resources Tập 42 Số 14 - Trang 3423-3432 - 2004
Mi‐Kyeong Jang, Byeong-Gi Kong, Young‐Il Jeong, Chang Hyung Lee, Jae‐Woon Nah
AbstractWe isolated α‐chitin, β‐chitin, and γ‐chitin from natural resources by a
chemical method to investigate the crystalline structure of chitin. Its
characteristics were identified with Fourier transform infrared (FTIR) and
solid‐state cross‐polarization/magic‐angle‐spinning (CP–MAS) 13C NMR
spectrophotometers. The average molecular weights of α‐chitin, β‐chitin, and
γ‐chitin, calculated with ... hiện toàn bộ
Hyperbranched polymers—All problems solved after 15 years of research? Tập 43 Số 13 - Trang 2679-2699 - 2005
Brigitte Voit
AbstractFifteen years of research on hyperbranched polymers in the group of
Brigitte Voit are described, with a focus first on hyperbranched polyester
synthesis and then on the addition and cycloaddition reactions used for the
preparation of the hyperbranched structure. The characterization of structural
details and bulk, solution, and thin‐film properties is highlighted, and steps
toward the eluc... hiện toàn bộ
Synthesis of monodisperse poly(divinylbenzene) microspheres Tập 31 Số 13 - Trang 3257-3263 - 1993
Kai Li, Harald D. H. Stöver
AbstractHighly crosslinked monodisperse poly(divinylbenzene) microspheres were
produced by precipitation polymerization with acetonitrile as solvent. The
radical initiators AIBN, BPO, and ADVN were used. The process does not require
stabilizers of any type, and produces monodisperse particles with diameters
between 2 and 5 μm, depending on the conditions. These microspheres do not swell
or dissolv... hiện toàn bộ
Phase separation in polystyrene latex interpenetrating polymer networks Tập 28 Số 3 - Trang 629-651 - 1990
H. R. Sheu, M. S. El‐Aasser, J. W. Vanderhoff
AbstractPolystyrene/polystyrene latex interpenetrating polymer networks (IPNs)
were prepared by seeded emulsion polymerzation of styrene–divinylbenzene
mixtures in crosslinked monodisperse polystyrene seed latexes. The resulting
latexes comprised uniform nonspherical particles, which were formed by
separation of the second‐stage monomer from the crosslinked seed network during
swelling and polymer... hiện toàn bộ