Preparation of cellulose nanowhiskers and their reinforcing effect in polylactide

Lee, Joohyung; Park, Sang Ho; Kim, Seong Hun

doi:10.1007/s13233-013-1160-0

Cited by 42 publications

(18 citation statements)

References 32 publications

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“…The washing process was repeated more than four times. The sample obtained was dried at 40 °C in vacuo for 48 h and CNC powder was obtained …”

Section: Methodsmentioning

confidence: 99%

Non‐isothermal crystallization behavior of PLA/acetylated cellulose nanocrystal/silica nanocomposites

Kim

2015

Polymer International

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Poly(lactide) (PLA)/acetylated cellulose nanocrystals (ACN)/silica nanocomposites were prepared by solution casting. Surface modification of cellulose nanocrystal (CNC) was performed to prepare the ACN. The ACN and silica were expected to act as a mechanical reinforcement of PLA and a nucleation agent, respectively, to increase the crystallization rate. Introduction of acetyl groups on the surface of the cellulose nanocrystals was confirmed by Fourier transform infrared spectroscopy. A combined Avrami − Ozawa analysis described the non‐isothermal crystallization effectively. The activation energy for the crystallization was calculated from the Kissinger and the Takhor equations. Spherulite growth behavior was observed by polarizing optical microscope and spherulite growth rate, the number of spherulite versus crystallization time have investigated. The development of PLA crystals and the thermal stability had a tendency to improve with increasing silica content. Increased tensile strength was observed due to the reinforcement effect of ACN and the morphology of the nanocomposites was investigated. © 2015 Society of Chemical Industry

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“…The washing process was repeated more than four times. The sample obtained was dried at 40 °C in vacuo for 48 h and CNC powder was obtained …”

Section: Methodsmentioning

confidence: 99%

Non‐isothermal crystallization behavior of PLA/acetylated cellulose nanocrystal/silica nanocomposites

Kim

2015

Polymer International

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“…Preparation of sulfonated nanocellulose from microcrystalline cellulose s-NC was prepared according to Hun Kim et al [29], using microcrystalline cellulose (MCC) as precursor. For this purpose, a volume of 50 mL of sulfuric acid was added dropwise to a well-stirred slurry containing 10 g of MCC in 100 mL of deionized water at 0 • C, followed by warming to 45 • C for 2 h and then cooling to room temperature with 500 mL of water to obtain a white dispersion.…”

Section: Nanomaterials Preparationmentioning

confidence: 99%

“…High-yielding one-pot synthesis of s-NC was accomplished by sulfuric acid hydrolysis according to Hun Kim [29]. As shown in Fig.…”

Section: Preparation and Characterization Of Sulfonated Nanocellulosementioning

confidence: 99%

Sulfonated nanocellulose for the efficient dispersive micro solid-phase extraction and determination of silver nanoparticles in food products

Ruiz-Palomero

Soriano

Valcárcel

2016

Journal of Chromatography A

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“…A Figura 21 apresenta uma análise termogravimétrica de filmes de PLA reforçados com NCs. [76,97] Figura 21-Curva TG (a) e sua derivada (b) de PLA puro e reforçado com 0,1 e 0,5% (m/m) de NCs.…”

Section: Nanocompósitos De Pla Reforçados Com Nanopartículas De Celuloseunclassified

“…[99] Este resultado pode ser explicado pelo fato da interação física entre os NCs levar à formação de uma estrutura de rede tridimensional interligada entre as nanopartículas e a matriz de PLA. [97,98,[100][101][102][103] …”

Section: Propriedades Reológicasunclassified

Obtenção e caracterização de PLA reforçado com nanocelulose.

Correia¹

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AGRADECIMENTOSAos meus pais, simplesmente por tudo! Pelo amor incondicional, carinho, dedicação e por terem me apoiado em todas minhas decisões. Ao meu irmão Augusto e meu namorado Bruno pelo companheirismo, toda compreensão e força nos momentos difíceis. Sem vocês nada disso faria sentido! Amo muito vocês! À Prof.ª Dra. Ticiane Sanches Valera pela orientação, atenção e apoio ao longo de todo este trabalho. Obrigada por ter me acolhido, por me apresentar este tema com o qual adorei trabalhar e, acima de tudo, obrigada pelo exemplo e pelos conhecimentos compartilhados! Ao meu coorientador Prof. Dr. Marcio Yee, Universidade Federal de São Paulo (UNIFESP), pela disponibilidade, mesmo trabalhando em outra cidade! Obrigada por ter me apresentado à Prof.ª Ticiane, pela paciência, compreensão e o enorme suporte que me proporcionou! Sem você tudo seria muito mais difícil!! Aos meus queridos amigos e colegas do Laboratório de Polímeros! Obrigada a todos por me ajudarem a fazer tudo isso dar certo! Obrigada a Fernanda, Nati e Kleber pelas conversas, pelas risadas, pelos chocolates (Kleber, nem um caminhão da Lacta poderia pagar por eles...), enfim, obrigada pela amizade única!! Às alunas mais novas Anita e Suellen. Su, obrigada por toda a ajuda no trabalho, espero que continuemos firmes e fortes para prosseguir com os trabalhos futuros! Obrigada Camila pela enorme ajuda em tudo que parecia que não ia dar certo, sua experiência no Laboratório é única e fez (e ainda faz) a diferença, muito Obrigada Palavras-chave: celulose, nanopartículas, biopolímeros, nanocompósitos, reologia. ABSTRACTCellulose is the renewable natural polymer currently available in greatest abundance. Cellulose is a semicrystalline polymer, and it is possible to extract its crystalline domains through a procedure that destroys its amorphous phase, such as acid etching, so obtaining crystalline cellulose particles called cellulose nanoparticles (NC). These nanoparticles have attracted great scientific interest because they have mechanical properties similar to those of many inorganic types of filler used in polymer matrix composites, like elastic modulus and tensile strength. Moreover, they have nanometric dimensions, which contribute to lower filler contents in the polymer matrix, due to its increased surface area when compared to the one of micrometric fillers. Nanocomposites formed by adding these fillers into polymeric matrices can present attractive commercial properties such as gas barrier, improved thermal properties, and low density, when compared to traditional composites. As NC are nanometric scale fillers, obtained from renewable sources, there is a great interest in their application into biodegradable biopolymer matrixes. Poly (lactic acid), PLA, is an example of biopolymer that presents improved thermal, mechanical and processing properties, when compared to the ones of other commercial biopolymers. In this work, cellulose nanoparticles (NC) were obtained, via acid hydrolysis, using three different methods, in order to study the most efficie...

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Preparation of cellulose nanowhiskers and their reinforcing effect in polylactide

Cited by 42 publications

References 32 publications

Non‐isothermal crystallization behavior of PLA/acetylated cellulose nanocrystal/silica nanocomposites

Non‐isothermal crystallization behavior of PLA/acetylated cellulose nanocrystal/silica nanocomposites

Sulfonated nanocellulose for the efficient dispersive micro solid-phase extraction and determination of silver nanoparticles in food products

Obtenção e caracterização de PLA reforçado com nanocelulose.

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