Miscibility and crystallization behavior of PBT/epoxy blends

Zhang, Huiliang; Ren, Ming‐Xun; Chen, Qingyong; Sun, Shulin; Sun, Xiaofeng; Zhang, Huixuan; Mo, Zhishen

doi:10.1002/polb.20785

Cited by 21 publications

(13 citation statements)

References 47 publications

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“…3, values of k and n are obtained from the slope and the intersection of the Avrami plots and the results are also presented in Table 2. It can be seen that the average value of the Avrami exponent n for pure PBT crystallization is about 2.7, which is in good agreement with previously reported data by the other authors [31][32][33][34][35][36] and also indicates the formation of the truncated spherical structure resulting from instantaneous nucleation with diffusion control [37]. The values of n for PBT/silica nanocomposites decrease slightly in comparison with these of pure PBT.…”

Section: Isothermal Crystallization Kinetics and Crystal Morphologysupporting

confidence: 90%

Preparation and characterization of poly(butylene terephthalate)/silica nanocomposites

Yao

Tian

Zhang

et al. 2009

Polymer Engineering & Sci

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In this study, we presented a convenient, in situ polymerization route for the preparation of Poly (butylene terephthalate) (PBT)/silica nanocomposites, in which silica was not premodified. The nanocomposites were synthesized by in situ polymerization of terephthalic acid (TPA), 1,4-butanediol (BD) and silica. The structure of these nanocomposites were investigated by Fourier transform infrared (FTIR) and thermogravimetric analyses (TGA). The results show that PBT chains were successfully grafted onto the surface of silica. Transmission electron microscope (TEM) micrographs revealed that silica were homogeneously dispersed in PBT matrix at a size level of 10-20 nm. The isothermal crystallization kinetics of pure PBT and PBT/silica nanocomposites were investigated by differential scanning calorimeter (DSC) and simulated by Avrami model. The existence of silica could lead to an acceleration of crystallization and enhance the thermal stability of PBT. According to dynamic mechanical analysis (DMA), the storage modulus of PBT/silica nanocomposites were markedly improved compared with pure PBT.

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Section: Isothermal Crystallization Kinetics and Crystal Morphologysupporting

confidence: 90%

Preparation and characterization of poly(butylene terephthalate)/silica nanocomposites

Yao

Tian

Zhang

et al. 2009

Polymer Engineering & Sci

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“…5 and the parameters obtained are listed in Table 3. It can be seen that pure PBT gives a average n value of about 2.7, which is in accordance with that reported in the literatures [30][31][32][33], indicating the formation of the truncated spherical structure resulting from instantaneous nucleation with diffusion control [34]. With addition of MWCNT, the value of n decreases evidently.…”

Section: Crystallization Kinetics Of Pctssupporting

confidence: 89%

Crystallization and thermal behavior of multiwalled carbon nanotube/poly(butylenes terephthalate) composites

et al. 2008

Polymer Engineering & Sci

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Multiwalled carbon nanotube/poly(butylene terephthalate) composites (PCTs) were prepared by melt mixing. The nonisothermal crystallization and thermal behavior of PCTs were respectively investigated by X-ray diffractometer, polarized optical microscope, differential scanning calorimeter, dynamic mechanical thermal analyzer, and thermogravimetric analyzer. The presence of nanotubes has two disparate effects on the crystallization of PBT: the nucleation effect promotes kinetics, while the impeding effect reduces the chain mobility and retards crystallization. The kinetics was then analyzed using Ozawa, Mo, Kissinger, Lauritzen-Hoffman, and Ziabicki model, and the results reveal that the nucleation effect is always the dominant role on the crystallization of PBT matrix. Thus the crystallizability increases with increase of nanotube loadings. In addition, the presence of nanotubes nearly has no remarkable contribution to thermal stability because nanotubes also play two disparate roles on the degradation of PBT matrix: the Lewis acid sites to facilitate decomposition and the physical hindrance to retard decomposition. Hence the nanotubes act merely as inert-like filler to thermal stability. FIG. 5. Avrami plots of log[Àln(1 À X(T))] vs. log t for the PCT1 sample at various cooling rates. FIG. 6. Ozawa plots of log[Àln(1 À X(T))] vs. ln / for (a) the PCT1 and (b) PCT5 samples.

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“…An addition of small amount of epoxy resin leads to an increase in the number of effective nuclei, thus resulting in an increase in crystallization rate. Zhang et al 33 have reported that the presence of a small amount of hyperbranched polyurethane acrylate (HUA) remarkably influences the crystallizability of polypropylene. An addition of HUA leads to an increase in the number of effective nuclei, thus resulting in an increase of crystallization rate and a clearer trend of instantaneous three-dimensional growth.…”

Section: Kinetic Analysismentioning

confidence: 99%

Kinetic Analysis on Effect of Poly(4-vinyl phenol) on Complex-Forming Blends of Poly(L-lactide) and Poly(D-lactide)

Woo

2009

Polym. J.

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Differential scanning calorimetry (DSC), Fourier transformed infrared spectroscopy (FT-IR) and polarized optical microscopy (POM) characterizations were performed to reveal interaction between amorphous poly(p-vinyl phenol) (PVPh) and crystalline stereocomplex of poly(L-lactic acid) (PLLA) and poly(D-lactic acid) (PDLA). The negative value of the interaction parameter 12 clearly confirms a thermodynamic miscibility in the ternary blend. At low contents, PVPh is well dispersed in the ternary blends, but PVPh may aggregate to nanodomains by self-associated hydrogen-bonding upon annealing. In addition, PVPh serves as an effective agent in reducing the spherulite sizes of the PLLA/PDLA crystals, which may be favorable in controlling the macroscopic properties. The Avrami and Tobin kinetic analysis methods were carried out to analyze the nonisothermal crystallization data, and the results showed that the ternary blends with an optimal range of 2-10 wt % PVPh were faster in the crystallization rate and smaller in the spherulite size than those with no PVPh or with PVPh contents greater than 10 wt %. Ternary blend containing higher PVPh contents may form large phase-separated domains and growth of the stereocomplex is hindered under the nonisothermal crystallization condition.

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Miscibility and crystallization behavior of PBT/epoxy blends

Cited by 21 publications

References 47 publications

Preparation and characterization of poly(butylene terephthalate)/silica nanocomposites

Preparation and characterization of poly(butylene terephthalate)/silica nanocomposites

Crystallization and thermal behavior of multiwalled carbon nanotube/poly(butylenes terephthalate) composites

Kinetic Analysis on Effect of Poly(4-vinyl phenol) on Complex-Forming Blends of Poly(L-lactide) and Poly(D-lactide)

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