Crystallization behavior and melting characteristics of wollastonite filled β-isotactic polypropylene composites

Ding, Qian; Zhang, Zishou; Wang, Chunguang; Jiang, Juan; Li, Gu; Mai, Kancheng

doi:10.1016/j.tca.2012.02.023

Cited by 37 publications

(28 citation statements)

References 42 publications

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“…Finally, the thermal degradation of the TiO 2 -PA sample occurs in two steps with maximum at 365 and 390°C; in this step, the evaporation of organic substances occurs as cyclohexanone is produced by the decomposition of bounded PA. These transitions are typically attributed to the evaporation of organic substances produced by the decomposition of pimelic acid [2,5,35]. An interesting observation is that the thermal stability of pimelic acid occurred at a greater temperature (at 180°C in comparison with that of raw pimelic acid molecules).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…iPP can crystallize into different crystalline phases depending on its stereochemical structure, molecular weight, temperature of crystallization, pressure applied during the crystallization process, and also by adding additives [1][2][3][4][5][6][7][8][9][10]. The main crystalline phases are known as a-, b-, c-, and mesomorphic or smectic form [2][3][4][5][6][7][8][9][10]. The a form is the primary form of polypropylene obtained under normal processing conditions [2][3][4][5][6]; however, the b-crystal is perhaps the most interesting crystalline phase for certain applications because of its hardness and impact resistance [2][3][4][5][6][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The main crystalline phases are known as a-, b-, c-, and mesomorphic or smectic form [2][3][4][5][6][7][8][9][10]. The a form is the primary form of polypropylene obtained under normal processing conditions [2][3][4][5][6]; however, the b-crystal is perhaps the most interesting crystalline phase for certain applications because of its hardness and impact resistance [2][3][4][5][6][8][9][10][11][12][13][14][15]. Therefore, different nucleating agents have been used to promote this type of crystal in iPP composites.…”

Section: Introductionmentioning

confidence: 99%

“…These authors found that PA and magnesium pimelate were weak b nucleators. Different substrates have been explored as supports for depositing calcium pimelate, e.g., carbonates [3,11,20], silicates [5,21], zeolites [4], oxides [3], metallic salts [8,9,14,22,23], clays [24], and carbon nanotubes [6], which are responsible for more than 90 % of the b-crystals. b nucleating agents continue as the main route to obtain b-phase in isotactic polypropylene.…”

Section: Introductionmentioning

confidence: 99%

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Effective method for the synthesis of pimelic acid/TiO2 nanoparticles with a high capacity to nucleate β-crystals in isotactic polypropylene nanocomposites

et al. 2015

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Functionalized titanium dioxide (TiO 2 ) nanospheres with pimelic acid (TiO 2 -PA) were synthesized through a novel and effective route, where the goal was to promote a high percentage of b-crystal into a matrix of isotactic polypropylene (iPP) by the use of low amount of nucleating agent. The successful chemical attachment of pimelic acid onto the TiO 2 surface was indicated by the presence of a new band at 1575 cm -1 and an increase in the thermal stability of the PA of approximately 200°C, which were observed through infrared spectra and thermogravimetric techniques, respectively. The iPP nanocomposite was analyzed by differential scanning calorimetry and wide-angle X-ray diffraction in order to identify b-crystals. An exothermic peak at 152°C and a diffraction peak at 2h = 16.2°confirmed the ability of the TiO 2 -PA nanoparticles to promote the b-crystal phase in the iPP nanocomposite even at low percentages (0.1 % w/w).About 85 % of b-crystal content was promoted with the TiO 2 -PA particles, that was significantly higher than the 25 % obtained by unmodified TiO 2 particles. Moreover, from visco-elastic analysis, it is evident that TiO 2 -PA particles help to improve the dissipation energy by effect of the promoted b-crystal phase in the polymer composites. Likewise, the AFM images provide evidence of the incompatibility of TiO 2 particles with the iPP matrix showing protruding reliefs in comparison with the homogeneous topography of the iPP/TiO 2 -PA composite. This results were confirmed by SEM, where the exclusion of TiO 2 particles was evident.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effective method for the synthesis of pimelic acid/TiO2 nanoparticles with a high capacity to nucleate β-crystals in isotactic polypropylene nanocomposites

et al. 2015

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A highly efficient β‐nucleating agent for impact‐resistant polypropylene copolymer

Liu

Tong

et al. 2014

J of Applied Polymer Sci

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In this work, we reported calcium tetrahydrophthalate as a high efficient b-nucleating agent (b-NA) for impact-resistant polypropylene copolymer (IPC). The relative fraction of the b-crystal can reach as high as 93.5% when only 0.03% b-NA is added. The non-isothermal and isothermal crystallization behaviors, morphology, lamellar structure and mechanical properties of IPCs with various b-NA contents were studied. During non-isothermal crystallization, the cooling rate has an important influence on the relative fraction of the b-crystal, which decreases remarkably as the cooling rate increases. The b-NA also greatly accelerates crystallization rate of IPC, resulting from both more crystal nuclei and larger Avrami exponent. The small angle X-ray scattering characterization shows that more amorphous components are included into the inter-lamellae after addition of b-NA. Dynamical mechanical analysis (DMA) reveals that the storage modulus at low temperature and the loss factor above 0 C from the PP component can be enhanced upon addition of b-NA and reach a maximum at the b-NA content of 0.05 wt %. Impact test shows that the impact strength of the IPC at 0 C can be improved as much as 40% when the content of calcium tetrahydrophthalate is 0.10 wt %. V C 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40753.

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Optimization of scratch resistance and mechanical properties in wollastonite-reinforced polypropylene copolymers

Sobhani

Khorasani²

2015

Polym. Adv. Technol.

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The aim of this research was to establish a balance between scratch resistance and scratch damage visibility in the wollastonite-filled heterophasic polypropylene copolymers.The influences of various factors including the surface hardness, elasticity, friction coefficient, and combinations thereof on the scratch behavior (scratch resistance and scratch visibility) were elucidated. Using micro-scale and nano-scale scratch tests and image analysis techniques, the scratch hardness, scratch depth, and scratch visibility of the composites were characterized.It was found that the introduction of wollastonite in the polypropylene copolymer matrix contributes to ductile fracture behavior because of an induced crystallization alteration. Accordingly, the scratch resistance of reinforced composites revealed an increase as a result of higher stiffness of the wollastonite as well as contribution of new crystalline structure. The addition of siloxane to the composites improved the resistance to surface damage by lowering the surface friction coefficient originated from enhanced chain mobility. Simultaneous addition of high density polyethylene and siloxane induced a significant influence on the resistance to the scratch damage.

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Crystallization behavior and melting characteristics of wollastonite filled β-isotactic polypropylene composites

Cited by 37 publications

References 42 publications

Effective method for the synthesis of pimelic acid/TiO2 nanoparticles with a high capacity to nucleate β-crystals in isotactic polypropylene nanocomposites

Effective method for the synthesis of pimelic acid/TiO2 nanoparticles with a high capacity to nucleate β-crystals in isotactic polypropylene nanocomposites

A highly efficient β‐nucleating agent for impact‐resistant polypropylene copolymer

Optimization of scratch resistance and mechanical properties in wollastonite-reinforced polypropylene copolymers

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