Crosslinking, cellulose

Modified polyurethanes as shown in Fig. 4.6 are used for valuable hand variations and as additives for cellulose crosslinkers. Their flexible and elastic films on the fibre surface improve elastic resilience, which is, for example, important for pile fabrics. The principle of their elasticity is, as in elastan fibres, the molecular combination of so-called weak and hard segments. The large weak... 

An unavoidable side effect of the cellulosic crosslinking finishes is a reduction in the elasticity and flexibility of the cellulose fibres. This produces a considerable decrease in abrasion resistance and tear and tensile strengths on natural cellulose... 

Chemical finishing of textiles Table 5.1 Positive effects of cellulosic crosslinking finishes and corresponding... 

Table 5.2 Disadvantages of cellulosic crosslinking finishes and possible remedies...

In commercial use, easy-care and durable press finishes are frequently combined with other finishes to provide additional properties such as water and oil repellency, flame retardancy, soil release and the like. Often the combination of another finish with the cellulose crosslinking finish will result in a more durable effect from the first finish. Combination with pigment printing is very common because of similar chemistry to cellulose crosslinking agents and binders and the similar application conditions. 

Disposal of the remainders of finish baths should be done in compliance with local regulations. Some catalysts used with these finishes contain zinc or other metals whose presence in waste water may be restricted. One side benefit of cellulose crosslinking finishes, especially the formaldehyde-containing ones, is increased resistance of the fabric to microbial attack. The effects of wrong condensation conditions for the common dry crosslinking process and steps to their optimisation are listed in Table 5.10. ... 

Non-slip finishes are mostly applied by the pad-dry process, combined as needed with hand builders, repellents or cellulose crosslinkers (easy-care finish). The combination of silicic acid sols with softeners or silicone-based water repellents is crucial - their effects are contrasting. 

Elastomeric finishes are often combined with easy-care and durable press finishes. The silicones reduce abrasion, increase tearing strength (Ehnendorf testing apparatus - ASTM D1424), and crease recovery. For equal crease resistance and durable press performance the amount of cellulose crosslinking agents can be markedly reduced in these combinations. ... 

Although not a measure of cellulose crosslinking, since mono functional agaits are incapable of crosslinking, the response to hydrolysis conditions of cotton fabric treated with N-methyl, N -hydroxymethylethyleieurea offers evidence of cellulose reaction. This response can be seen in Table II. Formaldehyde is released from the... 

Synonyms Croscarmellose (INCI) Crosslinked carboxymethyl cellulose Crosslinked cellulose gum Crosslinked CMC Crosslinked NaCMC Crosslinked sodium carboxymethylcellulose Crosslinked sodium CMC Sodium salt of crosslinked carboxymethyl ether cellulose Definition Sodium salt of thermally crosslinked carboxymethylated cellulose Properties Wh. to off-wh. free-flowing powd. odorless partly sol. in water insol. in ether, alcohol, org. soivs. pH 5-7 (1% disp.)... 

Crossential SA-14. See Vipers bugloss (Echium plantagineum) oil Crosslink PS 505. See Polyethylene Crosslink WA 405. See Dodecylbenzenesulfonic acid Crosslinked carboxymethyl cellulose Crosslinked cellulose gum Crosslinked CMC Crosslinked NaCMC. See Croscarmellose sodium... 

The y-irradiation of cellulose in the atmosphere associates oxidation and degradation mechanisms, as one would expect from the particularly high energy involved. A recent investigation has also shown that this type of treatment favours some cellulose crosslinking [86, 87], as well as a decrease in crystallinity accompanied by thermal degradation, whose extent increases with increasing irradiation doses [88]. 

Stiubianu, G. Racles, C. Cazacu, M. Simionescu, B. C., Silicone-Modified Cellulose. Crosslinking of Cellulose Acetate with Poly[dimethyl(methyl-H)siloxane] by Pt-Catalyzed Dehydrogenative Coupling. J. Mater. Sci. 2010,45,... 

Our own work was motivated by the hope that more detailed information on the postcure process of polyurethane elastomers could be obtained by combining the quantitative measurements like the enhancement in the mechanical properties in time with various dynamic processes which take place concomitantly, similarly as performed by Toffey et al in the case of cellulose crosslinking by urethane groups when the dynamic mechanical thermal analysis (DMTA) was used [341],... 

Suto S. Hydroxypropyl cellulose (crosslinked, cholesteric liquid crystal). In Salamone JC, ed. Polymeric Materials Encyclopedia, Vol 5. Boca Raton, FL CRC Press, 1996 3167-3171. 

Chemical Name Sodium carboxymethyl cellulose crosslinked Trade Name Aquasorb... 

Generally, crosslinking can be done using cellulose crosslinking agents (formaldehyde, dialdel rde, diisocyanate, halohydrin). 

Crosslinked under acid using cellulose crosslinking agents such as dialdehyde and aldehyde (formaldehyde). It polymerizes and crosslinks with a vinyl monomer and crosslinking agent (methylene bis acrylamide) using the tree radical initiator. 

Mu C, Guo J, Li X, Lin W, Lin D (2012]. Preparation and properties of dialdehyde carboxymethyl cellulose crosslinked gelatin edible films. Food Hydrocolloid, 27(1], 22-29. 

Levy, I Nussinovitch, A Shpigel, E Shoseyov, O. Recombinant cellulose crosslinking protein a novei paper-modification biomateriai. Cellulose, 2002,9, 91-8. 

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