Nucleation of polyvinyl alcohol crystallization by single-walled carbon nanotubes

Probst, Olga; Moore, Eric M.; Resasco, Daniel E.; Grady, Brian P.

doi:10.1016/j.polymer.2004.04.031

Cited by 176 publications

(109 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Such heterogeneous nucleation effects have also been noted to occur on nanofiller surfaces during melt as well as solution crystallization of other semicrystalline polymers including PE, nylon-6,6, poly(propylene) (PP), and poly(ethylene naphthalate) (PEN). 21,[42][43][44][45] A decrease in polymer crystal size and an increase in the rate of crystallization have also been observed during various studies performed under shear as well as under quiescent conditions. 43,44,46 Precipitation of PBT and CNF-PBT nanostructures Representative SEM micrographs of the 4.8% CNF-PBT precipitates obtained upon the solvent-antisolvent precipitation process are shown in Figure 7.…”

mentioning

confidence: 81%

Polymer crystallization and precipitation‐induced wrapping of carbon nanofibers with PBT

Mago

Kalyon

Fisher

2009

J of Applied Polymer Sci

View full text Add to dashboard Cite

Carbon nanofibers (CNFs) have attracted significant interest because of their excellent mechanical, electrical, and physical properties. Recent advances in chemical functionalization strategies are anticipated to extend their utility in various applications. In this study, noncovalent methods of CNF functionalization utilizing solution crystallization and precipitation techniques were used to create hybrid nanostructures consisting of CNFs and poly(butylene terephthalate) (PBT). Key to this study is the finding that o-chlorophenol can be used as a suitable solvent to dissolve PBT to generate these nanostructures. PBT crystallization was documented via wideangle X-ray analysis and differential scanning calorimetry and was due to the nucleation effect of the CNFs. The sizes of the PBT crystals could be manipulated by altering the polymer concentration. The solution crystallization and precipitation techniques provide an alternative strategy to alter and control the nanostructure/polymer interface. The resulting nanohybrid structures may potentially find use in a broad range of applications including electronic devices, sensors, and as reinforcing agents in a polymer matrix.

show abstract

mentioning

confidence: 81%

Polymer crystallization and precipitation‐induced wrapping of carbon nanofibers with PBT

Mago

Kalyon

Fisher

2009

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Carbon nanotubes [10,111, which can be considered as thin long cylinders made up by rolling graphite sheets, have been evaluated in recent years as additives to polymers for imparting several properties such as mechanical reinforcement, electrical and thermal conductivity, as well as faster crystallization. For example, Probst et al found that carbon nanotubes can nucleate crystallization of poly(vinyl alcohol) at concentrations as low as 0.1 wt% [12]. The crystallization behaviour of polypropylene (PP) in the presence of single walled carbon nanotubes (SWNTs) has also been reported [13-151.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotubes induced crystallization of poly(ethylene terephthalate)

Anand

Agarwal

Joseph

2006

Polymer

136

View full text Add to dashboard Cite

We have investigated the crystallization characteristics of melt compounded nanocomposites of poly(ethylene terephthalate) (PET) and single walled carbon nanotubes (SWNTs). Differential scanning calorimetry studies showed that SWNTs at weight fractions as low as 0.03 wt% enhance the rate of crystallization in PET, as the cooling nanocomposite melt crystallizes at a temperature 10 °C higher as compared to neat PET. Isothermal crystallization studies also revealed that SWNTs significantly accelerate the crystallization process. WAXD showed oriented crystallization of PET induced by oriented SWNTs in a randomized PET melt, indicating the role of SWNTs as nucleating sites.

show abstract

“…Há relatos na literatura que, mesmo que o polímero utilize os nanotubos como núcleo de cristalização, a adesão na interface nanotubo/polímero é da mesma ordem dos cristais normais e/ou da região amorfa. Portanto, mesmo com a tendência de aumento da área interfacial, a adesão entre a matriz e os nanotubos rege a capacidade de reforço nos nanocompósito produzidos [20,21] .…”

Section: Resultados E Discussõesunclassified

Propriedades mecânicas, tribológicas e térmicas de nanocompósitos de PLLA com nanotubos de carbono de paredes múltiplas

et al. 2014

View full text Add to dashboard Cite

Resumo: Neste trabalho são estudados os efeitos da adição de nanotubos de carbono de parede múltipla (NCPM) em uma matriz de Poli(L-ácido láctico) (PLLA). Foras avaliadas duas rotas distintas de dispersão dos NCPM, uma utilizando agitação mecânica em solvente e a outra utilizando sonificação de alta energia em solvente. As propriedades mecânicas destes nanocompósitos foram avaliadas utilizando nanoindentação e microdureza vickers. Através da calorimetria exploratória diferencial foram determinadas as propriedades térmicas dos nanocompósitos (Tg, Tc, Tm e cristalinidade) obtidas. Por último, as propriedades tribológicas foram determinadas através de ensaios de deslizamento do tipo pino sobre disco, onde foram utilizadas diferentes cargas normais. As propriedades mecânicas e térmicas não foram significativamente afetadas pela adição do nanotubos, o que não se repetiu nas propriedades tribológicas, onde tanto o método de dispersão quanto a concentração de NCPM afetaram as propriedades. A micrografia das trilhas de desgaste sugere ainda que o mecanismo atuante foi modificado com a incorporação dos nanotubos, o mesmo pode ter acontecido nas amostras sonificadas. Palavras-chave: Nanotubos de carbono de paredes múltiplas, PLLA, propriedades mecânicas, propriedades tribológicas. Mechanical, Tribological and Thermal Properties of PLLA/MWCNT NanocompositesAbstract: This work studied the effects of the addition of Multiwalled Carbon Nanotubes (MWCNT) to a PLLA matrix. Two distinct methods of preparation were employed: a combination of a solvent/ mechanical stirring and a combination of a solvent/high energy sonication. The mechanical properties of the nanocomposites were determined by nanoindentation and by the Vickers hardness test. Thermal properties of the nanocomposites (T g , T c , T m and crystallinity degree) were determined by DSC. The tribological properties of the nanocomposites were determined by using a pin-on-disc apparatus. Mechanical and thermal properties did not present significant alterations, although tribological properties presented significant changes caused by the method of preparation and different loads. SEM images indicated that the wear mechanism was changed by the addition of MWCNT. Keywords: Multiwalled carbon nanotubes, PLLA, mechanical properties, tribological properties. IntroduçãoA partir do trabalho de Iijima [1] os nanotubos de carbono (NC) têm atraído a atenção da comunidade acadêmica devido as suas propriedades peculiares [2] . Após o primeiro nanocompósito de NC e epóxi [3] , os nanotubos já foram incorporado em mais de 30 matrizes diferentes [4] e o artigo de Iijima foi citado mais de 25 mil vezes [5] . Os NC podem ter uma única parede (NCPS) ou ter paredes múltiplas (NCPM) e essa diferença interfere diretamente nas suas propriedades e nas propriedades obtidas dos nanocompósitos [2] .Além do tipo de NC, outros fatores têm influência nas propriedades finais do nanocompósito. Entre esses fatores pode-se citar o diâmetro, o comprimento e a pureza dos nanotubos de carbono [6] . Além disso...

show abstract

Nucleation of polyvinyl alcohol crystallization by single-walled carbon nanotubes

Cited by 176 publications

References 34 publications

Polymer crystallization and precipitation‐induced wrapping of carbon nanofibers with PBT

Polymer crystallization and precipitation‐induced wrapping of carbon nanofibers with PBT

Carbon nanotubes induced crystallization of poly(ethylene terephthalate)

Propriedades mecânicas, tribológicas e térmicas de nanocompósitos de PLLA com nanotubos de carbono de paredes múltiplas

Contact Info

Product

Resources

About