Molecular modeling of cellulose in amorphous state part II: effects of rigid and flexible crosslinks on cellulose

Chen, Wei; Lickfield, Gary C.; Yang, Charles Q.

doi:10.1016/j.polymer.2004.08.023

Cited by 51 publications

(16 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The density of amorphous cellulose is generally given as 1.48 g/cm 3 . (Chen et al 2004) Since the crystallinity of the MFC films is substantially less than 100% (ca. 63%), (Aulin et al 2009) the density of MFC films is expected to be between 1.48 and 1.63 g/cm 3 .…”

Section: Mfc Dispersion Viscositiesmentioning

confidence: 99%

Oxygen and oil barrier properties of microfibrillated cellulose films and coatings

Aulin

Gällstedt²,

Lindström³

2010

Cellulose

657

460

View full text Add to dashboard Cite

The preparation of carboxymethylated microfibrillated cellulose (MFC) films by dispersioncasting from aqueous dispersions and by surface coating on base papers is described. The oxygen permeability of MFC films were studied at different relative humidity (RH). At low RH (0%), the MFC films showed very low oxygen permeability as compared with films prepared from plasticized starch, whey protein and arabinoxylan and values in the same range as that of conventional synthetic films, e.g., ethylene vinyl alcohol. At higher RH's, the oxygen permeability increased exponentially, presumably due to the plasticizing and swelling of the carboxymethylated nanofibers by water molecules. The effect of moisture on the barrier and mechanical properties of the films was further studied using water vapor sorption isotherms and by humidity scans in dynamic mechanical analysis. The influences of the degree of nanofibrillation/dispersion on the microstructure and optical properties of the films were evaluated by fieldemission scanning electron microscopy (FE-SEM) and light transmittance measurements, respectively. FE-SEM micrographs showed that the MFC films consisted of randomly assembled nanofibers with a thickness of 5-10 nm, although some larger aggregates were also formed. The use of MFC as surface coating on various base papers considerably reduced the air permeability. Environmental scanning electron microscopy (E-SEM) micrographs indicated that the MFC layer reduced sheet porosity, i.e., the dense structure formed by the nanofibers resulted in superior oil barrier properties.

show abstract

Section: Mfc Dispersion Viscositiesmentioning

confidence: 99%

Oxygen and oil barrier properties of microfibrillated cellulose films and coatings

Aulin

Gällstedt²,

Lindström³

2010

Cellulose

657

460

View full text Add to dashboard Cite

show abstract

“…The abscissa of Figure 1 has been converted from moisture content in the constituent to wood moisture content based on Figure 2 , which is constructed based on available literature data. The Poisson ' s ratios in the LT plane used for the three constituents are 0.2 for cellulose and hemicelluloses (Chen et al 2004 ;Peura et al 2007 ) and 0.33 for lignin (Cousins 1976 ). These are assumed to be unaffected by both moisture and temperature.…”

Section: Numerical Modellingmentioning

confidence: 99%

Tensile creep and recovery of Norway spruce influenced by temperature and moisture

Engelund¹,

Salmén²

2012

Holzforschung

View full text Add to dashboard Cite

The time-dependent mechanical behaviour (TDMB) of wood is important when using the material for structural purposes. Recently, a new method for predicting the TDMB by numerical modelling was established based on the assumption that TDMB is caused by the sliding of the microfi brils past each other. In this study, the TDMB is examined via creep experiments on small specimens of Norway spruce latewood. The results of these are compared with results from numerical modelling. The experiments include results at two levels of moisture content and three levels of temperature, enabling an investigation of these two climatic factors on TDMB of wood. It was found that the mechanical response of wood tissue is the sum of responses from both tracheids and middle lamella, with only the previous being reversible. The effect of moisture and temperature differed in that the latter affected the elastic and time-dependent responses equally. Moisture, on the other hand, reduced both the elastic properties and the activation energy barrier for sliding of the microfi brils, but furthermore changed the microfi bril angle of the sample as a result of swelling. Hereby, moisture had a larger effect on the time-dependent response than the elastic. All of these effects were predicted by numerical modelling.

show abstract

“…Soybean oil is an inexpensive, renewable resource, whose triglycerides can be modified with maleic anhydride to create a flexible crosslinker. This concept of the 'flexible crosslinker' was discussed in Chen [7].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Analysis of Cotton Treated with Neutralized Maleinized Soybean Oil

Ford

Mendon

Rawlins

et al. 2010

J Americ Oil Chem Soc

View full text Add to dashboard Cite

Water-soluble vegetable oil derivatives were synthesized and investigated as biobased reagents for cellulosic textiles. Maleinized soybean oil (MSO), having an acid value of 156 mg KOH/g, was neutralized with ammonium hydroxide to render it water soluble. Infrared spectroscopy indicated the formation of ester linkages during the cure of MSO treated textiles. Therefore, the formation of anhydride and amide intermediates upon heating ammonia neutralized MSO were investigated. Construction of the cyclic anhydride was observed as a pathway to esterification; however, amidation was not observed among this ammonia neutralized MSO. Neutralization of MSO with ethanolamine and triethylamine yielded secondary and tertiary amides but not esters at 160°C.

show abstract

Molecular modeling of cellulose in amorphous state part II: effects of rigid and flexible crosslinks on cellulose

Cited by 51 publications

References 17 publications

Oxygen and oil barrier properties of microfibrillated cellulose films and coatings

Oxygen and oil barrier properties of microfibrillated cellulose films and coatings

Tensile creep and recovery of Norway spruce influenced by temperature and moisture

Spectroscopic Analysis of Cotton Treated with Neutralized Maleinized Soybean Oil

Contact Info

Product

Resources

About