Fabrication and characterization of emulsified and freeze-dried epoxy/cellulose nanofibril nanocomposite foam

Li, Jinghao; Yan, Qiangu; Cai, Zhiyong

doi:10.1007/s10570-018-2164-x

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…There was a new peak at 31.52 for PLA/CNF5 and 32.07 for PLA/CNF10 nanocomposite foams; it seems that an organization with a longer range between CNF and PLA has been formed to strengthen the PLA foam peak, which may improve mechanical performance 70 . For PLA/CNF15 and PLA/CNF20, due to the higher amount of CNF, this peak disappears and is difficult to observe.…”

Section: Resultsmentioning

confidence: 97%

Impacts of cellulose nanofibers on the morphological behavior and dynamic mechanical thermal properties of extruded polylactic acid/cellulose nanofibril nanocomposite foam

Sadeghi

Marfavi

et al. 2021

J of Applied Polymer Sci

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Polylactic acid (PLA) foams were introduced as a good substitute for oil-based foams. Much research has been done on the autoclave of PLA foam, but discontinuous processes are not attractive for industries. In order to reduce the distance between the PLA foaming process and industrialization, it is necessary to introduce continuous processes. In this work, two solutions to improve the foaming of PLA are presented: using the extrusion process and adding cellulose nanofibers. So, in this study, a twin screw extruder was used by blowing agent, CO 2 , and in order to better dissolve the gas, a static mixer was used before the die. The molecular weight of the original PLA after extrusion has reduced in the range from 20%-28% due to the hydrolysis of the ester bond in the PLA. With the cellulose nanofiber loading, nucleation and cell density have enhanced. Scanning electronic microscope (SEM) microscopic images for the nanocomposites containing 1.5 wt% of cellulose nanofiber showed the highest cellular expansion and for the nanocomposites containing 2.0 wt% of cellulose nanofiber showed the most uniform cell distribution and it confirmed the density results and the calculated expansion ratio. Finally, by examining the dynamic-mechanical thermal analysis, it can be stated that the composition of cellulose nanofibers improves the mechanical and dynamic properties of cellulose nanofiber-reinforced PLA.

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Section: Resultsmentioning

confidence: 97%

Impacts of cellulose nanofibers on the morphological behavior and dynamic mechanical thermal properties of extruded polylactic acid/cellulose nanofibril nanocomposite foam

Sadeghi

Marfavi

et al. 2021

J of Applied Polymer Sci

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“…The result indicated that the epoxy coated the CNF walls and glued the CNF microstructural nodes which can improve the mechanical strength, but excess epoxy residue may cause higher density of the foam while having limited improvement of the compressive modulus and strength. The 4% tert-butyl might have a negative effect on the performance of these composite foams which decreased the compressive properties compared to the composite foams without tert-butyl in our previous study [17]. Moreover, it should be indicated that the pure epoxy foam sample cannot form porous structure using the same emulsion fabricating method.…”

Section: Compressive Propertiesmentioning

confidence: 70%

“…The aspheric pores structure was observed in SEM images for composite foams, because the ice crystal geometry determined the porous geometry and size. In addition, the frozen temperature determined the ice crystal geometry, which indirectly affected the structure of the composite foam [16,17]. Furthermore, the porosity of these composite foams was calculated according to bulk density and true density of pulverized foam [27].…”

Section: Resultsmentioning

confidence: 99%

“…Epoxy foams have been recently developed due to their high thermal and chemical stability, but it required solvents as blowing agent to form a porous structure [14]. In our previous study, we developed a series of CNF-based organic aerogels using a freeze drying process in which the pore liquid is exchanged with air while maintaining the integrity of the solid network [15][16][17]. In order to improve the strength of CNF aerogel while having an excellent thermal and chemical stability, epoxy was used as reinforcement to strengthen the CNF structural foam.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical properties and characteristics of structural insulated panels with a novel cellulose nanofibril-based composite foam core

Yan

Cai

2020

Jnl of Sandwich Structures & Materials

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The cellulose nanofibril material utilized in structural composites has attracted considerable attention in recent decades. However, developing and manufacturing such products are still somewhat problematic. In this research, cellulose nanofibril aerogel and epoxy/cellulose nanofibril composite foam with different epoxy weight ratios have been developed to make structural insulated panels. A batch of small-scale samples was used to investigate the mechanical properties and characteristics of structural insulated panels with different cellulose nanofibril-based core materials. The morphology showed that the epoxy uniformly encapsulated the cellulose nanofibril fiber walls, and the cellulose nanofibrils were the critical components to form a threedimensional framework. The ratio of epoxy and cellulose nanofibril in these composite foams had a noticeable effect on their mechanical properties. Moreover, the thermal conductivities for pure cellulose nanofibril, epoxy/CNF10, and epoxy/CNF5 samples were 0.034, 0.045, and 0.050 W/mK, respectively. These thermal values are in the similar range of commercial insulated foam in current use.

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“…Cellulose nano bers with outstanding characteristics such as high speci c surface area and excellent tolerance, good mechanical properties, high resistance performance and low thermal expansion coe cient have aroused great interest in composite materials and all cellulose nanocomposites (ACC) (Li, Yan, Cai 2019;Abdul et al 2014), which are often used in many applications, from aerospace industry to civil engineering and building applications (Zhang et al 2019;Yu et al 2018). Nishino et al (2004) proposed the de nition of all cellulose composites (ACC).…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of All Cellulose Self-reinforced Nanocomposites from Bamboo Shoot Fibers

Yang

Fan

Fang

et al. 2021

Preprint

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Herein, a novel and facile fabrication method of self-reinforced all cellulose nanocomposite based on 2,2,6,6-tetramethylpiperidine-1-oxy (TEMPO) mediated oxidized bamboo shoot shell fibers was introduced. The composites were thoughtfully characterized. Cellulose nanowhiskers from the bamboo shoot fibers with the diameter of 60–90 nm and a large number of micropores were evenly distributed on the surface of the nanocomposite. Compared with the original fiber, the crystallinity of the composites increased, while the thermal stability decreased. The composite also showed good mechanical property and dimensional stability. It provides a promising and convenient route to obtain firm sheet-materials with micro- or nano- structures from nature cellulose fibers.

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Fabrication and characterization of emulsified and freeze-dried epoxy/cellulose nanofibril nanocomposite foam

Cited by 8 publications

References 25 publications

Impacts of cellulose nanofibers on the morphological behavior and dynamic mechanical thermal properties of extruded polylactic acid/cellulose nanofibril nanocomposite foam

Impacts of cellulose nanofibers on the morphological behavior and dynamic mechanical thermal properties of extruded polylactic acid/cellulose nanofibril nanocomposite foam

Mechanical properties and characteristics of structural insulated panels with a novel cellulose nanofibril-based composite foam core

Facile Preparation of All Cellulose Self-reinforced Nanocomposites from Bamboo Shoot Fibers

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