Isothermal crystallization of poly(ether ether ketone) with different molecular weights over a wide temperature range

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Jiho Seo ◽  
Anne M. Gohn ◽  
Olivia Dubin ◽  
Hideaki Takahashi ◽  
Hirokazu Hasegawa ◽  
...  
Keyword(s):  
Wide Temperature Range ◽  
Isothermal Crystallization ◽  
Temperature Range ◽  
Molecular Weights ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone

Processable poly(ether ether ketone imide)s

2021 ◽  
pp. 095400832110550
Author(s):  
Aslam B Tamboli ◽  
Shivaji D Ghodke ◽  
Arati V Diwate ◽  
Makrand D Joshi ◽  
Vijay P Ubale ◽  
...  
Keyword(s):  
Weight Loss ◽  
Organic Solvents ◽  
Amic Acid ◽  
Good Thermal Stability ◽  
Molecular Weights ◽  
Good Solubility ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Tetracarboxylic Dianhydride

New aromatic poly(ether ether ketone imide)s, [PEEKimide]s, were synthesized successfully from 1,3-bis-4′-(4″-aminophenoxy benzoyl) benzene and various commercially available aromatic dianhydrides, such as pyromellitic dianhydride (PMDA), 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA), 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA), 4,4′-oxydiphthalic anhydride (OPDA) and 4,4′-(hexafluro isoproylidene) diphthalic anhydride (HFDA), by two step polycondensation method. These PEEKimides were characterized by FT-IR, solubility in organic solvents, inherent viscosity, DSC, TGA and WXRD. Inherent viscosities of the precursor poly(ether ether ketone amic acid)s were in the range of 0.23–0.40 dl/g in DMF, indicating formation of moderate to high molecular weights. These poly(ether ether ketone imide)s showed good solubility in polar aprotic solvents such as N,N-dimethylacetamide (DMAc), N-methyl 2-pyrrolidone (NMP), N,N-dimethylformamide (DMF) and dimethyl sulphoxide (DMSO) and had glass transition temperatures in the range 245–279°C. Poly(ether ether ketone imide)s showed no weight loss below 280°C; temperatures for 10% weight loss (T10) were in the range of 406–483°C and char yields at 800°C were 17–34%, indicating their good thermal stability. All these poly(ether ether ketone imide)s were amorphous in nature, as per patterns of WXRD which exhibited diffuse broad halos at (2θ = 10–30°) and amorphous nature was reflected in polymer’s good solubility in common organic solvents.

Effects and properties of poly(arylene ether benzonitrile)s of various molecular weights blended with sulfonated poly(ether ether ketone)

2007 ◽  
Vol 107 (5) ◽  
pp. 3236-3243
Author(s):  
Han-Lang Wu ◽  
Chen-Chi M. Ma ◽  
Chun-Chieh Lin ◽  
Yie-Chan Chiu ◽  
Chih-Yuan Chen ◽  
...  
Keyword(s):  
Molecular Weights ◽  
Arylene Ether ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Sulfonated Poly

scholarly journals Non-Isothermal Crystallization Kinetics of Short Glass Fiber Reinforced Poly (Ether Ether Ketone) Composites

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2094 ◽  
Author(s):  
Xujing Yang ◽  
Yazhuo Wu ◽  
Kai Wei ◽  
Wenjun Fang ◽  
Haofei Sun
Keyword(s):  
Glass Fiber ◽  
Crystallization Kinetics ◽  
Isothermal Crystallization ◽  
Isothermal Crystallization Kinetics ◽  
Short Glass Fiber ◽  
Glass Fiber Reinforced ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Short Glass

Due to its excellent chemical and temperature resistances, short glass fiber reinforced poly (ether ether ketone) composite (SGF/PEEK) is a promising material for application in automotive lightweight. Processing conditions, such as cooling rate, need to be well controlled to obtain the optimal crystallite morphology of PEEK composites. Thus, in this paper, the non-isothermal crystallization kinetics and melting behavior of SGF/PEEK were investigated by differential scanning calorimetry (DSC) at different cooling rates, and the crystallite sizes were evaluated by the X-ray diffraction technique (XRD). Crystallization kinetics models and effective activation energies were evaluated to determine the crystallization parameters of the composites. The results suggest that a lower cooling rate enlarges the size of crystallites and enhances the uniformity of size distribution. The addition of glass fibers improves the nucleation rate owing to heterogeneous nucleation while decreasing the growth rate due to retarded movement of the polymer chain. The combined Avrami-Ozawa equation was shown to describe accurately the non-isothermal crystallization. The absolute value of the crystallization activation energy for SGF/PEEK is lower than that of pure PEEK.

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