Miscibility and crystallization behavior of solution‐blended PEEK/PI blends

Kong, Xiangjun; Tang, Hao; Lisong, Dong; Teng, Fengen; Feng, Zhaochi

doi:10.1002/(sici)1099-0488(19980930)36:13<2267::aid-polb3>3.3.co;2-7

Cited by 3 publications

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“…It is well‐known that the interaction between PP and EPR is considerably weak, and as a result, the variation of composition hardly affects the miscibility 27, 28. To explain these thermal behaviors of PP‐cats, it is necessary to take their compositions into account.…”

Section: Resultsmentioning

confidence: 99%

Effect of composition and component structure on thermal behavior and miscibility of polypropylene catalloys

Shangguan

Tao

Zheng

2007

J of Applied Polymer Sci

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ABSTRACT:The thermal behavior and the miscibility of an in-situ polypropylene blend named polypropylene catalloys (PP-cats) were investigated by using modulated differential scanning calorimeter (MDSC). It is found that all PP-cats samples present two glass transitions, one of which is ascribed to the ethylene-propylene random copolymer (EPR), and the other, to isotactic polypropylene (PP). However, no glass transition of ethylene-propylene block copolymer (E-b-P) responsible for a third component in PP-cats could be found. With the increase of EPR, the glass transition temperatures responding to PP and EPR components, T g , PP and T g , EPR , shift to low temperature, because of the enhancement of the interaction between PP and EPR component and the increase of ethylene content in EPR, respectively. Furthermore, the difference between T g , PP and T g , EPR remarkably decreases with the increase of the total ethylene content in PP-cats, which indicates that the miscibility of PP-cats is strongly dependent on the composition. Comparing the T g , PP and T g , EPR with T g of fractionated PP and EPR, we ascribe the T g change of PP fraction to the increase of EPR content; while that of EPR, to the increase of ethylene content in EPR. These experimental results suggest that the existence of E-b-P plays an important role in improving the miscibility between propylene homopolymer and EPR in PP-cats.

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Section: Resultsmentioning

confidence: 99%

Effect of composition and component structure on thermal behavior and miscibility of polypropylene catalloys

Shangguan

Tao

Zheng

2007

J of Applied Polymer Sci

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“…Polymer additives may not always form a blend with other polymer additives. The literature [1][2][3][4] and raw material companies give very low additive ratio (less than10%), but in recent years our research [5,6] shows that this ratio could be as high as 20-30%, giving rise to a composite that possesses better properties than the original material.…”

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confidence: 99%

Comparison of optical properties and mechanical/electrical degradation of some low density polyethylene-and polypropylene-based polymer blends

2007

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Boydağ, Fatma Şenel (Dogus Author)In this study, the optical properties as well as mechanical and electrical degradation of low-density polyethylene (LDPE)/polypropylene fiber (PP fiber) (10–50% PP fiber), polypropylene (PP)/PP fiber (10–50% PP fiber), and LDPE/diamond (0.1–3% diamond) blends, which are prepared by hot pressing method, with changing thicknesses ranging from 30 to 225 µm, are compared. The spectra, in the wavelength range 200–2500 nm, are examined. Based on optical absorption spectra obtained, Tauc graphs are plotted. Determined values of the direct optical energy gap (E d opt ), the indirect optical energy gap (E i opt ), the width of the band (ΔE), and ultraviolet transmittance (TUV) are listed. The direct E d opt and indirect E i opt values for organic blends are in the range of 3.10–3.17 eV and 1.52–2.99 eV; for inorganic blends they are 1.80–4.13 eV and 1.55–4.7 eV respectively. The electrical strength (ε) and the mechanical tension (σ) have been investigated, and graphs (the dependence of the electrical life time log τε on ε) are given. The experimental results are analyzed from the viewpoint of the validity of the thermofluctuation theory. LDPE and LDPE/0.5% diamond composite parameters consecutively changed: σ from 68 to 82 MPa, ε from 60·106 to 85·106 V/m, mechanical lifetime τσ from 10 to 1.5·105 sec, electrical lifetime τε from 2· 103 to 2·105 sec, and structure-sensitive parameters γ and χ — from 1.48 to 1.18 (J)MPa/mole and from 0.97 to 0.70 (J)Vm−1/mole respectively. The values of mechanical and electrical durability were observed to increase by 20 and 41%, respectively, for LDPE/0.5% diamond composite

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“…Any significant change in L with composition would indicate miscibility of the polymer blend constituents in the solid state, with segregation of the amorphous component between the crystalline lamellae. 17,18 Even though it appears, from DSC data, that macrocycle 1 does not copolymerise into the PEEK backbone during ED-ROP, both the crystallite thickness and the interlamellar spacing can be affected physically by the compatibility between the PEEK and the poly(thioether-ketone). If the component polymers were partially compatible, interdiffusion at their interphase would reduce the crystallinity of PEEK, causing a decrease in crystallite thickness and, at the same time, an increase in inter-lamellar distance, L. From Table 1 and Fig.…”

Section: Resultsmentioning

confidence: 99%

Ring-opening polymerization in molten PEEK: transient reduction of melt-viscosity by macrocyclic aromatic thioetherketones

Manolakis

Cross²,

Ward³

et al. 2012

J. Mater. Chem.

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Blends of PEEK with macrocyclic thioether-ketones show initial melt-viscosities reduced by more than an order of magnitude relative to the polymer itself, enabling more facile processing and fabrication. On raising the temperature of the melt, however, the macrocycle undergoes spontaneous, entropically driven ring-opening polymerization (ED-ROP), so that the properties of the final polymer should not, in principle, be compromised by the presence of low-MW macrocyclic material.

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Miscibility and crystallization behavior of solution‐blended PEEK/PI blends

Cited by 3 publications

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Effect of composition and component structure on thermal behavior and miscibility of polypropylene catalloys

Effect of composition and component structure on thermal behavior and miscibility of polypropylene catalloys

Comparison of optical properties and mechanical/electrical degradation of some low density polyethylene-and polypropylene-based polymer blends

Ring-opening polymerization in molten PEEK: transient reduction of melt-viscosity by macrocyclic aromatic thioetherketones

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