Isothermal and nonisothermal melt‐crystallization kinetics of syndiotactic polystyrene

Chen, Qingyong; Yu, Yingning; Na, Tianhai; Zhang, Hongfang; Mo, Zhishen

doi:10.1002/app.10192

Cited by 28 publications

(32 citation statements)

References 28 publications

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“…It can be seen that the activation energy for the sPS/SWNT-PS nanocomposites is dependent on the nanotubes content. For example, the activation energy of neat sPS is 379 kJ/mol, which is approximately consistent with the value obtained by Wu et al [64] (466 kJ/mol) and Chen et al [65] (315 kJ/mol) for melt crystallization, decreases with the presence of 0.10 wt% nanotube in the nanocomposites (347 kJ/mol) and then increases with increasing nanotube content (407 kJ/mol for 0.30 wt% SWNT-containing nanocomposite and 437 kJ/mol for 1.0 wt% SWNT-con- The results indicate that the nanotubes seem to perform two functions in the sPS matrix. One is that the tubes act as nucleating agents and may accelerate the non-isothermal crystallization of sPS.…”

Section: The Activation Energy For Non-isothermal Crystallizationsupporting

confidence: 90%

Non-isothermal crystallization kinetics of syndiotactic polystyrene polystyrene functionalized SWNTs nanocomposites

Xiong

Gao²,

Li³

2007

Express Polym. Lett.

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Carbon nanotubes (CNTs) are unique nanostructured materials with remarkable physical, mechanical and electronic properties [1][2][3][4]. These properties make them attractive for applications in many scientific and technological fields such as electronic structures [5], polymer composites [6], and biological systems [7]. Among these potential applications, the prospect of obtaining high-performance CNT based polymeric nanocomposites has attracted the efforts of researchers in both academia and industry [8]. The combination of organic polymer components with CNT fillers in a single material has extraordinary significance for the development of advanced materials with remarkable mechanical, electrical, thermal and multifunctional properties [9][10][11][12]. Moreover, polymer/CNT nanocomposites challenge traditional filled polymers (loadings of 20 wt% or more) in many of these areas by providing similar physical enhancements but with as little as about 1 wt% addition of dispersed nanotubes [13]. Previous CNT based polymeric nanocomposites reports include increased modulus, impact strength, heat distortion temperature, and barrier properties with decreased thermal expansivity [14][15][16]. In addition, these nanocomposites are finding potential applications such as electrostatically dissipative materials and aerospace materials [17]. Currently, several processing methods, including melt mixing, solution process and in-situ polymerization [18][19][20] Abstract. Non-isothermal crystallization kinetics were characterized by using differential scanning calorimetry (DSC) analysis on neat semicrystalline syndiotactic polystyrene (sPS) and its nanocomposites with polystyrene (PS) functionalized full-length single walled carbon nanotubes (SWNT-PS), which was prepared by copper (I) catalyzed click coupling of alkyne-decorated SWNTs with well-defined, azide-terminated PS. The crystallization behavior of neat sPS polymer was compared to its SWNT based nanocomposites. The results suggested that the non-isothermal crystallization behavior of sPS/SWNT-PS nanocomposites depended significantly on the SWNT-PS contents and cooling rate. The incorporation of SWNT-PS caused a change in the mechanism of nucleation and the crystal growth of sPS crystallites, this effect being more significant at lower SWNT-PS content. Combined Avrami and Ozawa analysis was found to be effective in describing the non-isothermal crystallization of the neat sPS and its nanocomposites. The activation energy of sPS determined from nonisothermal data decreased with the presence of small quantity of SWNT-PS in the nanocomposites and then increased with increasing SWNT-PS contents.

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Section: The Activation Energy For Non-isothermal Crystallizationsupporting

confidence: 90%

Non-isothermal crystallization kinetics of syndiotactic polystyrene polystyrene functionalized SWNTs nanocomposites

Xiong

Gao²,

Li³

2007

Express Polym. Lett.

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“…sPS is also known to crystallize much faster than iPS. [ 36 ] For comparison, particles of aPS were also prepared.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Anisotropic Submicron Particles From Semicrystalline Polymers

Staff

Lieberwirth

Landfester

et al. 2012

Macro Chemistry & Physics

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The synthesis of colloidally stable submicron particles of syndiotactic polystyrene (sPS) and isotactic polystyrene (iPS) is reported. Model particles based on poly‐L‐lactic acid (PLLA), atactic polystyrene (aPS), sPS, and iPS are prepared by the evaporation of a solvent present in miniemulsion droplets. The degree of crystallinity of the particles is found to decrease with their size, as shown by DSC and WAXS measurements. Remarkably, nonspherical particles can be formed in the dispersed state with sPS and iPS, whereas PLLA and aPS particles always display spherical morphologies.

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“…To find a method to describe properly the nonisothermal crystallization process, Liu and coworkers [33] proposed a novel method for nonisothermal crystallization process and successfully dealt with the nonisothermal crystallization behaviour of nylon-11 [34], PEDEKK [35], nylon-66 [36], nylon-46 [37], nylon-1212 [38], syndiotactic polystyrene [39], PP-PP-g-MAH-Org-MMT [40], and PETIS [41]. They obtained the following equation:…”

Section: Combined Avrami and Ozawa Equationsmentioning

confidence: 99%

Thermomechanical behavior and nonisothermal crystallization kinetics of poly(ε-caprolactone) and poly(ε- caprolactone)/poly(N-vinylpyrrolidone) blends

2010

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Poly(ε-caprolactone) (PCL) and PCL/Poly(N-vinylpyrrolidone) (PVP) blends are shown to have the potential to be used in a range of biomedical applications and can be processed with successive in-situ polymerization procedures. In this paper, the thermomechanical analysis of PCL and PCL/PVP blends was performed using dynamic mechanical analysis (DMA). The storage and loss moduli as a function of temperature and frequency were recorded. The nonisothermal crystallization kinetics of PCL and PCL/PVP blends were analyzed using Ozawa model and Mo-Liu equation, a combination equation of Avrami and Ozawa formulas. The Ozawa analysis failed to describe the nonisothermal crystallization behavior of blends, whereas the Mo-Liu equation successfully described the nonisothermal crystallization kinetics of PCL and PCL/PVP blends. In addition, the value of crystallization rate coefficient under nonisothermal crystallization conditions was calculated. The PCL/PVP blends compared with the pure PCL and PVP had a restrain effect on the crystallization kinetics of PCL in the blends. Combining the results of DMA and DSC, PVP effectively decreased the crystallinity of PCL and enhanced its damping properties, which indicated that PCL/PVP blends could be more suitable than PCL in some biomedical applications, as it might help in the dissipation of the mechanical energy generated by the patient movements.

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Isothermal and nonisothermal melt‐crystallization kinetics of syndiotactic polystyrene

Cited by 28 publications

References 28 publications

Non-isothermal crystallization kinetics of syndiotactic polystyrene polystyrene functionalized SWNTs nanocomposites

Non-isothermal crystallization kinetics of syndiotactic polystyrene polystyrene functionalized SWNTs nanocomposites

Preparation and Characterization of Anisotropic Submicron Particles From Semicrystalline Polymers

Thermomechanical behavior and nonisothermal crystallization kinetics of poly(ε-caprolactone) and poly(ε- caprolactone)/poly(N-vinylpyrrolidone) blends

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