Self-reinforced composites obtained by the partial oxypropylation of cellulose fibers. 1. Characterization of the materials obtained with different types of fibers

Menezes, Aparecido Júnior de; Pasquini, Daniel; Curvelo, Antônio Aprígio da Silva; Gandini, Alessandro

doi:10.1016/j.carbpol.2008.11.006

Cited by 41 publications

(21 citation statements)

References 29 publications

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“…The concept of all-cellulose composites has been explored for a wide range of cellulose materials including wood pulp fibres [250,251], filter and Kraft paper [252][253][254][255], MCC [256][257][258][259][260], sisal [261,262], ramie [263], regenerated cellulose (Lyocell) and cellulose fibres spun from an anisotropic phosphoric acid solution (Bocell) [264], and BC [265]. These studies showed great promise.…”

Section: Applications and New Advances In Cellulose Nanocompositesmentioning

confidence: 99%

Review: current international research into cellulose nanofibres and nanocomposites

et al. 2010

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This paper provides an overview of recent progress made in the area of cellulose nanofibre-based nanocomposites. An introduction into the methods used to isolate cellulose nanofibres (nanowhiskers, nanofibrils) is given, with details of their structure. Following this, the article is split into sections dealing with processing and characterisation of cellulose nanocomposites and new developments in the area, with particular emphasis on applications. The types of cellulose nanofibres covered are those extracted from plants by acid hydrolysis (nanowhiskers), mechanical treatment and those that occur naturally (tunicate nanowhiskers) or under culturing conditions (bacterial cellulose nanofibrils). Research highlighted in the article are the use of cellulose nanowhiskers for shape memory nanocomposites, analysis of the interfacial properties of cellulose nanowhisker and nanofibrilbased composites using Raman spectroscopy, switchable interfaces that mimic sea cucumbers, polymerisation from the surface of cellulose nanowhiskers by atom transfer radical polymerisation and ring opening polymerisation,

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Section: Applications and New Advances In Cellulose Nanocompositesmentioning

confidence: 99%

Review: current international research into cellulose nanofibres and nanocomposites

et al. 2010

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“…Apart from the expected absence of a Tg feature for the pristine filter paper, all the other samples gave values comprised between -55 and -45°C, compared with the Tg of the isolated PPO which was about -60°C. This behavior was already observed with different polysaccharides grafted with PPO chains (Schoenenberger et al 1995;VelazquezMorales et al 1998;Gandini et al 2005;de Menezes et al 2007de Menezes et al , 2008 and has been interpreted as reflecting the glass transition of the appended polyether chains (i.e., somewhat less mobile than free ones), without any substantial contribution from the polysaccharide trunk macromolecules.…”

Section: Resultsmentioning

confidence: 59%

“…This investigation has now progressed qualitatively and quantitatively and we wish to report here the results related to the role of the oxypropylation catalyst on the performance of the systems. The influence of the nature of both natural and regenerated cellulose fibers on this process has been reported elsewhere (de Menezes et al 2008).…”

Section: Introductionmentioning

confidence: 98%

Self-reinforced composites obtained by the partial oxypropylation of cellulose fibers. 2. Effect of catalyst on the mechanical and dynamic mechanical properties

et al. 2008

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This work describes the partial oxypropylation of filter paper cellulose fibers, employing two different basic catalyst, viz., potassium hydroxide and 1,4-diazabicyclo [2.2.2] octane, to activate the hydroxyl groups of the polysaccharide and thus provide the anionic initiation sites for the ''graftingfrom'' polymerization of propylene oxide. The success of this chemical modification was assessed by FTIR spectroscopy, X-ray diffraction, scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis and contact angle measurements. The study of the role of the catalyst employed on the extent of the modification and on the mechanical properties of the ensuing composites, after hot pressing, showed that both the Brønsted and the Lewis base gave satisfactory results, without any marked difference.

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“…Benzylated fibers show the formation of a thermoplastic region surrounding the fiber core [141][142][143][144]. This effectively grafts a thermoplastic polymer matrix onto the outer surfaces of the fibers, with the amount measured by the weight gain [146][147][148]. Fiber volume fractions of up to 40% have been achieved using this method.…”

Section: Benzylated and Oxypropylated Cellulosesmentioning

confidence: 99%

All‐Cellulose Composites

Staiger

Huber

2012

Wiley Encyclopedia of Composites

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Composite materials comprising a mixture of shellac resin as the matrix and cellulose as the reinforcement were developed. The influence of the reinforcement content and the concentration of additives on the mechanical performance and processing were investigated. A high content of cellulose and low concentrations of ethanol and polyethylene glycol produced biocomposites with high stress resistance and a high Young's modulus, whereas a low content of cellulose and a high concentration of additives gave samples a low Young's modulus and high elasticity. Two types of cellulose-based reinforcements with different polarity, namely, mechanically refined wood pulp and cellulose acetate butyrate particles, were compared. The efficiency of the composite over the two model reinforcements, i.e., hydrophilic and hydrophobic components, respectively, was also studied. Although particle reinforcement was easier to process and evenly dispersed into the matrix, its mechanical performance was lower compared with refined fibres. Scanning electron microscopy showed that the matrix better coated the fibres than the particles, resulting in better adhesion and mechanical performance. The morphology of reinforcement played a key role; long fibres oriented in the pulling direction ensured a better mechanical resistance than particle fillers.

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Self-reinforced composites obtained by the partial oxypropylation of cellulose fibers. 1. Characterization of the materials obtained with different types of fibers

Cited by 41 publications

References 29 publications

Review: current international research into cellulose nanofibres and nanocomposites

Review: current international research into cellulose nanofibres and nanocomposites

Self-reinforced composites obtained by the partial oxypropylation of cellulose fibers. 2. Effect of catalyst on the mechanical and dynamic mechanical properties

All‐Cellulose Composites

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