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Compatibilizers added into filler-reinforced polymer composites are supposed to bring about the enhancement of mechanical properties by binding with the filler and entanglement with the polymer matrix. We elucidated the binding of maleic anhydride-modified polypropylene (MAPP) compatibilizer and microcrystalline cellulose (MCC) filler. This is usually not readily detectable by spectroscopy. For this,...
Magnetically anisotropic materials were fabricated in film form from cellulose nanocrystal (CNC)/ι-carrageenan (ι-Car) gelatinous composites (5–30 wt% CNC) via repeated “in situ synthesis” of iron oxide nanoparticles therein and subsequent drawing of the inorganic–polysaccharide hybrids in a wet process. Basic magnetic properties of the film samples were examined by superconducting quantum interference...
We fabricated composite hydrogels using surface-modified cellulose nanofiber (CNF) as a multifunctional crosslinker and N-isopropylacrylamide (NIPAM) as a monomer. Surface modification of CNF was performed using maleic anhydride (MA), which endowed the CNF with not only aqueous dispersibility but also vinyl polymerizability. We characterized the MA-modified CNF (MACNF) using wet chemical analysis,...
We fabricated high performance films using cellulose butyral (CB) synthesized from native cellulose. Two-step reactions were adopted to produce the derivative CB, including etherification of cellulose with glycidol in NaOH/urea aqueous solution to yield O-(2,3-dihydroxypropyl) cellulose (DHPC), and butyralization of DHPC. Both DHPC and CB products were easily processed into a thin film by hot-press...
Investigations were made into the molecular dynamics and intercomponent mixing state in solid films of two series of cellulosic graft copolymers, cellulose acetate-g-poly(ε-caprolactone) (CA-g-PCL) and cellulose butyrate-g-PCL (CB-g-PCL), both series being prepared over a wide range of compositions with CAs or CBs of acyl DS ≈ 2.1, 2.5, and 2.95. It was shown by T 1ρH measurements in...
Cellulose diacetate-graft-poly(lactic acid)s (CDA-g-PLAs) were synthesized successfully over a wide range of composition in combination of different ways of graft polymerization: a copolycondensation of lactic acid; a ring-opening copolymerization of l-lactide in dimethyl sulfoxide; and a copolymerization similar to the second, but in bulk, each initiated at residual hydroxyl positions on CDA. Differential...
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