High strength fiber obtained from a high stereoregularity metallocene catalyst-synthesized polypropylene

Kunimitsu, Tatsuma; Toyoda, Kai; Ikaga, Toshifumi; Kim, KyoungHou; Ohkoshi, Yutaka; Koike, Katsuhiko

doi:10.1016/j.polymer.2020.122654

Cited by 8 publications

(3 citation statements)

References 31 publications

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“…The most commercial one is the isotactic Polypropylene (iPP), thanks to its good regularity and high tendency towards crystallization. Its usage has to expand in the automotive and mechanical fields [2]. It is a semicrystalline polymer, it has a relatively low density and a low price, excellent moisture, ease of processability, high toughness and chemical resistance [3].…”

Section: Introductionmentioning

confidence: 99%

Non-isothermal crystallization kinetics and its effect on the mechanical properties of homopolymer isotactic polypropylene

et al. 2021

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The non-isothermal crystallization of the isotactic Polypropylene (iPP) was studied using differential scanning calorimetry and polarizing optical microscopy. Jeziorny's model and Ozawa's theoretical approaches were applied to study the nonisothermal kinetics of the iPP. Jeziorny's approach proved to be the most relevant model to the present material. Simultaneously, the activation energy was calculated with Kissinger's method and Vyazovkin's iso-conversional approach. Indeed, the latter provides an activation energy varying between 100 and 176 kJ/mol. Furthermore, the WAXD scans indicated the presence of a single crystalline form in the used material. To study the effect of the microstructure on the mechanical properties of the iPP, multiscale tensile tests were carried out for different film microstructures. At macroscopic scale, the increase in the diameter of spherulites, inevitably accompanied by a rise in the crystallinity rate, induces the growth of rigidity, brittleness, and elastic limit. Moreover, the results of the in-situ micro-tensile tests present the evolution of spherulites during loading.

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Section: Introductionmentioning

confidence: 99%

Non-isothermal crystallization kinetics and its effect on the mechanical properties of homopolymer isotactic polypropylene

et al. 2021

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“…The modification through chemical polymerization refers to the introduction of the metallocene catalyst during the procedure of polymerization. Compared with the Z-N catalyst, the special PP fiber grade materials synthesized by the metallocene catalyst features a narrower distribution of molecular weight, a lower melting point, finer fibers, more uniform filament size and greater flexibility [6,7]. Due to the technological constraints of the metallocene catalyst and the limitations of the polymerization process in China, the method of modification through blending is often adopted to enhance the flexibility of special PP fiber grade materials.…”

Section: Introductionmentioning

confidence: 99%

Properties of Special Polypropylene Fiber Grade Materials/Propylene-ethylene Copolymer Blends

Chen

Liu

Meng

et al. 2023

J. Phys.: Conf. Ser.

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Special propylene-ethylene copolymer (PEC) and polypropylene (PP) fiber grade materials were blended through the melt-compounding method to prepare the PP/PEC blends in varying proportions. Subsequently, further analysis was carried out on the crystallinity, dispersibility, mechanical properties and flexibility of the PP/PEC blends. The results haven shown that PEC is uniformly dispersed in the PP matrix, whereas the size of the PEC particle is relatively smaller. Moreover, as the content of PEC increases, the crystallization temperature of the PP/PEC blends (T cp) would experience increases accordingly. In addition, the Young’s modulus and the tensile strength of the PP/PEC blends would experience decreases with evident increases in the impact strength. Last but not least, the softness of PP would experience increases to a certain extent with the addition of PEC.

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“…Conversely, metallocene catalysts having a single active site, can polymerize iPP with a narrower MWD [3]. The narrower MWD is very advantageous for the production of high-quality PP fiber [4]. In addition, due to the limitation of the Ziegler-Natta catalyst, the molecular weight of PP produced is relatively large.…”

Section: Introductionmentioning

confidence: 99%

Crystallization and mechanical properties of carbon nanotube/continuous carbon fiber/metallocene polypropylene composites

Tan

Guo²,

Tan

et al. 2022

Mater. Res. Express

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In this work, a high fluidity polypropylene prepared with the metallocene catalyst (mPP) was used as matrix, carbon nanotube (CNT) and continuous carbon fiber (CCF) were added to prepare composites, and their mechanical properties, melting and crystallization behavior were investigated. In the mechanical properties, the effects of tension force in the preparation process and compatibilizer maleic anhydride grafted polypropylene (MAPP) on the tensile strength of the composites were researched. The results show that the tensile strength of the composites increases first and then decreases with the increase of tractive force. In addition, the melting and crystallization behaviors and dynamic mechanical behaviors of mPP, CNT/mPP and CNT/CCF/mPP composites were characterized and studied by a differential scanning calorimetry (DSC) and dynamic mechanical analyzer (DMA). The results show that the melting point (Tm ), crystallization temperature (Tc ) and storage modulus (E') of CNT/mPP are all increased by adding 1wt% CNT, especially the Tc is increased by 8.8 ºC. It shows that after CNT was added to mPP as inorganic carbon material, it plays a prominent role in heterogeneous nucleation. After CCF was composited with CNT/mPP, the composites with CCF content of 30 and 42wt% were prepared, and their Tm , Tc , crystallinity (Xc ) and E' were all improved, especially E' was greatly improved, such as the initial E' was increased by 5.64 and 11.74 times. Even at the end of the curve, the E' of the composites with CF is still significantly higher than that of mPP and CNT/mPP. It indicates that adding CCF will greatly improved the deformation resistance and load deformation temperature of mPP.

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High strength fiber obtained from a high stereoregularity metallocene catalyst-synthesized polypropylene

Cited by 8 publications

References 31 publications

Non-isothermal crystallization kinetics and its effect on the mechanical properties of homopolymer isotactic polypropylene

Non-isothermal crystallization kinetics and its effect on the mechanical properties of homopolymer isotactic polypropylene

Properties of Special Polypropylene Fiber Grade Materials/Propylene-ethylene Copolymer Blends

Crystallization and mechanical properties of carbon nanotube/continuous carbon fiber/metallocene polypropylene composites

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