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Hierarchical porous structures in cellulose materials are important for the dissolution, properties and applications of cellulose materials. Methods for characterizing the hierarchical porous structures in cellulose materials without changing its original state are still limited. In this work, we introduced nuclear magnetic resonance (NMR) relaxometry for characterizing the hierarchical porous structures...
The primary aim of this paper is to explore the influence of the number of CH 2 groups per –(CH 2 ) n OCOO– repeat unit (Num c ) on the properties of poly(alkylene carbonate)s. A series of poly(alkylene carbonate)s with different Num c , including PTMC (Num c = 3), PTeMC (Num c = 4), PPMC (Num c = 5), PHMC (Num c = 6) and...
Novel star-shaped copolymers, comprised of a thermo-sensitive poly(N-isopropylacrylamide) (PNIPAAm) segment and three hydrophobic poly(ɛ-caprolactone) (PCL) arms were fabricated. The copolymers were prepared by stannous octoate (Sn(Oct) 2 ) catalyzed ring-opening polymerization of ɛ-caprolactone (CL) using cholic acid functionalized PNIPAAm as the macroinitiator. The lower critical solution...
A novel six-membered cyclic carbonate with pendent allyl ether group, 5-allyloxy-1,3-dioxan-2-one (ATMC), was synthesized from glycerol, and the corresponding polycarbonate, poly(5-allyloxy-1,3-dioxan-2-one) (PATMC) was further synthesized by ring-opening polymerization in bulk at 120°C. Two kinds of catalyst, tin(II) 2-ethylhexanoate (Sn(Oct) 2 ) and immobilized porcine pancreas lipase on...
Porcine pancreas lipase (PPL) immobilized on silica particles with different size were prepared and employed successfully for ring-opening co-polymerization of 5-benzyloxy-trimethylene carbonate (BTMC) with 5,5-dimethyl-trimethylene carbonate (DTC) for the first time. Three kinds of silica particles with different sizes (150–250, 75–150 and 1 μm) were selected as carriers for enzyme immobilization...
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