Effect of Functionalization of Multiwalled Nanotubes on the Crystallization and Hydrolytic Degradation of Biodegradable Poly(<scp>l</scp>-lactide)

Zhao, Yuanyuan; Qiu, Zhaobin; Yang, Wantai

doi:10.1021/jp805230e

Cited by 142 publications

(103 citation statements)

References 40 publications

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“…Similar results were also found in the poly(L-lactide)/MWNTs nanocomposites. 26 From Figure 5, it can also be found that the corresponding diffraction peaks intensity values are almost the same for neat PHB and the 99.5/ 0.5 nanocomposite and slightly higher than those for the 99/1 nanocomposite. Thus, the values of degree of crystallinity are estimated to be around 72% for neat PHB and the 99.5/0.5 nanocomposite; however, the degree of crystallinity is reduced to be around 65% for the 99/1 nanocomposite.…”

Section: Isothermal Melt Crystallization Kinetics Of Neat Phb and Itsmentioning

confidence: 78%

Isothermal Melt Crystallization Kinetics Study of Biodegradable Poly(3-hydroxybutyrate)/Multiwalled Carbon Nanotubes Nanocomposites

Qiu

2009

Polym. J.

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Poly(3-hydroxybutyrate) (PHB) is a truly biodegradable and highly biocompatible polymer; [1][2][3][4][5][6] however, wider application range of PHB has been limited because of its stiffness and brittleness problems. Moreover, its melting temperature is so close to the thermal decomposition temperature that PHB becomes thermally unstable during processing. Therefore, many attempts have been made to improve its mechanical and thermal properties, among which polymer blending is an easy and convenient way of achieving desirable combination of properties. Ha et al. and Di Lorenzo et al. have recently reviewed miscibility, properties and biodegradability of polymer blends containing PHB. 7,8Addition of nano-particles such as carbon nanotubes (CNTs) to form nanocomposites has provided another means to improve materials performances.9,10 CNTs possess unique mechanical, electrical and thermal properties that make it ideal candidates to substitute conventional nano-fillers in the fabrication of polymer nanocomposites. [11][12][13][14][15][16] It is noted that the strong interfacial adhesion between polymer chains and nanotubes is critically important to effectively maximize load transfer from the matrix to CNTs. Recently, PHB/single walled carbon nanotubes (SWCNTs) nanocomposites have been prepared by solution casting method using chloroform as cosolvent. 17 The experimental results showed that the crystalline size substantially decreased for the PHB/SWCNTs nanocomposite with a 1% weight fraction of SWCNTs as compared to that of neat PHB; moreover, the polymer nanocomposite films showed an increase in hardness and Young's modulus with increasing SWCNTs contents. 17To the best of our knowledge, biodegradable PHB/multiwalled carbon nanotubes (MWNTs) nanocomposites have not been reported so far in the literature. We have recently prepared PHB/MWNTs nanocomposites at different MWNTs loadings by solution casting method and studied the effects of the presence of MWNTs and their loadings on the subsequent multiple melting behavior of PHB in the nanocomposites crystallized non-isothermally from the melt. 18 In this note, we further studied the isothermal melt crystallization kinetics of neat PHB and the PHB/MWNTs nanocomposites for a better understanding of the influence of the presence of MWNTs and the loadings on the crystallization behavior of PHB in the PHB/MWNTs nanocomposites.

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Section: Isothermal Melt Crystallization Kinetics Of Neat Phb and Itsmentioning

confidence: 78%

Isothermal Melt Crystallization Kinetics Study of Biodegradable Poly(3-hydroxybutyrate)/Multiwalled Carbon Nanotubes Nanocomposites

Qiu

2009

Polym. J.

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“…With addition of clay or CNTs, the T cc of PLA further decreases and the crystallinity degree (X c %) increases remarkably. Like those reported on the PLA composites, much work has reported that both the clay [72][73][74][75] and the CNTs [76][77][78][79] also have heterogeneous nucleation effect on the crystallization of PLA. The decrease in T cc , therefore, suggests that not only the PLA phase localized clay tactoids, but also the interface localized CNTs can promote the cold crystallization of PLA component.…”

Section: Crystallization Behavior Of the Ternary Systemsmentioning

confidence: 80%

Selective Localization of Nanofillers: Effect on Morphology and Crystallization of PLA/PCL Blends

Lin

Zhang

et al. 2011

Macro Chemistry & Physics

230

176

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Adding nanofillers to PLA/PCL blends to change their surface and interface properties can improve their phase morphology. Here the selective localization of CNTs and organoclays as the third component in the blend is studied. It is found that clay is selectively localized in the PLA phase and at the phase interface whereas CNTs are mainly found in the PCL phase and at the phase interface. With a reduced viscosity ratio of the blend matrices, the CNTs change their preferred localization from PCL to PLA. The effects of the different selective localization of clay and CNTs on the morphologies are studied. In addition, the crystallization behavior of ternary systems also shows a strong dependence on the selective localization of nanofillers. magnified image

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“…[7,8] It has been reported in several cases that the modification of the surface of the carbon nanotubes with functional groups can help to disperse them, and may lead to enhancement of mechanical properties and electrical conductivity in different matrices. [9][10][11][12][13][14][15][16][17][18][19][20][21] In the case of the preparation of polymer nanocomposites based on carbon nanotubes, various researchers have reported an improvement of the mechanical properties when covalently surfacemodified carbon nanotubes were used. Compared with non-covalently functionalized CNTs, covalently functionalized ones can interact directly with the matrix system as the polymer bound to the CNT can transfer stress directly from the matrix to the CNT structure.…”

Section: Introductionmentioning

confidence: 99%

New strategies for the chemical characterization of multi-walled carbon nanotubes and their derivatives

et al. 2012

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Effect of Functionalization of Multiwalled Nanotubes on the Crystallization and Hydrolytic Degradation of Biodegradable Poly(l-lactide)

Cited by 142 publications

References 40 publications

Isothermal Melt Crystallization Kinetics Study of Biodegradable Poly(3-hydroxybutyrate)/Multiwalled Carbon Nanotubes Nanocomposites

Isothermal Melt Crystallization Kinetics Study of Biodegradable Poly(3-hydroxybutyrate)/Multiwalled Carbon Nanotubes Nanocomposites

Selective Localization of Nanofillers: Effect on Morphology and Crystallization of PLA/PCL Blends

New strategies for the chemical characterization of multi-walled carbon nanotubes and their derivatives

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