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Article
The efficient synthesis of poly(silapropynylenes) via condensation of NaCэCNa with R1R2SiCL2 activated by pyridine
To efficiently prepare poly(silapropynylenes), the condensation of NaCэCNa with R1R2SiCl2 activated by pyridine were investigated. The condensation produced tactable polymers(Mw ca. 2100–9000) with significantly ...
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Article
Effect of heat treatment on structural changes and dynamic mechanical relaxation of polyacrylonitrile fibers
The structural changes of polyacrylonitrile fibers have been studied through the effect of heat treatment on dynamic mechanical relaxation of undrawn and drawn fibers. It is generally accepted that polyacrylon...
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Article
New AB or ABA type block copolymers: atom transfer radical polymerization (ATRP) of methyl methacrylate using iodine-terminated PVDFs as (macro)initiators
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Article
Phase Transition of Cellulose Solutions in N-Methyl Morpholine N-Oxide Hydrates
Melting dissolution conditions of cellulose in N-methyl morpholine N-oxide(NMMO) hydrate had a profound effect on the phase behavior of cellulose/NMMO/H2O systems. Introducing an antioxidant, n-propyl gallate (PG...
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Article
Effect of Thermal History on the Phase Behavior of N-Methyl Morpholine N-Oxide Hydrates and Their Solutions of Cellulose
N-Methyl morpholine N-oxide (NMMO) hydrates, used in the preparation of cellulose spinning dope for lyocell manufacturing, have various crystal structures according to the hydration number (n). A single melting p...
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Article
Preparation of regenerated cellulose fiber via carbonation. I. Carbonation and dissolution in an aqueous NaOH solution
Cellulose carbonate was prepared by the reaction of cellulose pulp and CO2 with treatment reagents, such as aqueous ZnCl2 (20–40 wt%) solution, acetone or ethyl acetate, at −5–0°C and 30–40 bar (CO2) for 2 hr. Am...