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

González-Calderón, J. A.; Montesinos, Javier Vallejo; Mata-Padilla, José M.; Pérez, Elı́as; Almendárez-Camarillo, A.

doi:10.1007/s10853-015-9365-6

Cited by 26 publications

(34 citation statements)

References 43 publications

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“…The 1540 cm -1 band was assigned to the symmetric vibration of carbonyl group within the calcium pimelate structure [19,60]. During the investigation on titanium dioxide (TiO 2 ), the appearance of the double band was interpreted as the proof that an additional bond between PA and titanium ion was being formed and as the evidence of successful attachment of the PA molecule to the TiO 2 surface [61]. In other investigations too, the double band was interpreted as a confirmation of supporting calcium pimelate on the surface of montmorillonite [58,62].…”

Section: Ftir Of Graphene Oxide/pimelic Acid and Reduced Graphene Oximentioning

confidence: 99%

Nucleating agents based on graphene and graphene oxide for crystallization of the β-form of isotactic polypropylene

et al. 2019

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During the investigations, functionalization of graphene oxide synthesized using modified Hummers' method and its reduced form was performed. Mixtures of graphene oxide and reduced graphene oxide with pimelic acid and calcium hydroxide were prepared for functionalization. During the reaction, the molecules of pimelic acid were attached to the surface of graphene sheets. By forming links between the carboxylic groups of pimelic acid and graphene oxide, the durable connection was achieved. The functionalized graphene oxide and the reduced graphene oxide were used as additives in isotactic polypropylene crystallization. The influence of additives on crystallisation in non-isothermal conditions was examined using polarized optical microscopy and differential scanning calorimetry. The effect of the additives on the polypropylene structure was analysed using wide-angle X-ray scattering. For both functionalized compounds, the nucleating ability towards b-form of polypropylene was detected. Both additives showed the increase in the nucleation rate and promotion of growth of the b-form crystals. Nucleation efficiency similar to other nucleating agents used in the crystallization of the b-form of polypropylene was revealed.

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Section: Ftir Of Graphene Oxide/pimelic Acid and Reduced Graphene Oximentioning

confidence: 99%

Nucleating agents based on graphene and graphene oxide for crystallization of the β-form of isotactic polypropylene

et al. 2019

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“…3(b) refers to the oxide functionalized with pimelic acid; it is possible to see the characteristic bands of this dicarboxylic acid located at around 2950 and 2845 cm-1 that are related to -CH2 stretching ( − ); the band at 1580 cm -1 can be attributed to the carbonyl group stretching ( = ), and vibrations at 1465 and 1315 cm -1 are attributed to C-O-H in-plane bending ( − − ) and stretching vibrations ( − ), respectively; and finally the peak at 1415 cm -1 can be attributed to asymmetric ( ) stretching vibrations of the carboxylate group (COO-) [63]. It is important to mention that a new band appeared at 1540 cm -1 , unlike the spectrum of pure pimelic acid [36,64,65]; this can be attributed to the bond between the pimelic acid molecules and metal ions. With respect to the modification with APTES, in Fig.…”

Section: Non-isothermal Crystallization Kineticsmentioning

confidence: 99%

“…The main objetive of these inorganic fillers is mainly to reduce costs; however, the inclusion of these particles improves physical and mechanical performance by changing properties such as color, rigidity, dimensional stability, toughness and transparency [13,[24][25][26][27][28][29][30][31][32][33][34]. TiO2 is one of the most commonly used fillers [25,26,35,36] and is added to the polymer matrix in order to modify its electrical, optical and mechanical properties. The introduction of these fillers offers functionality without significantly increasing the cost of the material [37].…”

Section: Introductionmentioning

confidence: 99%

Use of Chemically Modified Titanium Dioxide Particles to Mediate the Non-isothermal Cold Crystallization of Poly(latic acid)

et al. 2020

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In this work, the effect of the chemical modification of titanium dioxide particles on the non-isothermal crystallization process of polylactic acid (PLA) was studied. Cold crystallization in some polymers occurs above the glass transition temperature (Tg) when the polymer chains gain sufficient mobility to organize themselves into the ordered structure (i.e. the crystal structure) by folding the chains. Cold crystallization in general is caused by the ordering of the molecular chains in the crystalline PLA due to the increased mobility during heating. Through an analysis of the cool crystallization process in DSC at different cooling rates, it was observed that the behavior of PLA and its composites made with titanium dioxide, neat and functionalized with dicarboxylic acids, can be described through the models used for crystallization of the polymer carrying out during cooling, such as Mo’s and Jeziorny’s model. In addition, it was determined that the chemical modification of TiO2 performed with silane increases the crystallization rate in the last step of the process; while the chemical modification with dicarboxylic acid has an accelerated effect on the crystal formation process attributed to the affinity between the aliphatic part of this group and the polymer chains. Also, it was shown that the inclusion of the silanized particles has no effect on the energy requirement compared to the pure PLA process; however, the addition of particles with the dicarboxylic acid decreases the energy value required to complete the crystalline state due to affinity at the surface to immobilize the polymer chains. Finally, it is emphasized that the activation energy required to perform the crystallization of PLA and its composites has positive values, which is an indicator that the crystallization was performed while heating, after reaching and passing the glass transition temperature and before melting.

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“…A. Gonzalez-Calderon, Vallejo-Montesinos, Mata-Padilla, Pérez, & Almendarez-Camarillo, 2015;J. X. Li & Cheung, 1999;.…”

Section: Introductionmentioning

confidence: 99%

The role of alkoxysilanes functional groups for surface modification of TiO2 nanoparticles on non-isothermal crystallization of isotactic polypropylene composites

et al. 2020

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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

Cited by 26 publications

References 43 publications

Nucleating agents based on graphene and graphene oxide for crystallization of the β-form of isotactic polypropylene

Nucleating agents based on graphene and graphene oxide for crystallization of the β-form of isotactic polypropylene

Use of Chemically Modified Titanium Dioxide Particles to Mediate the Non-isothermal Cold Crystallization of Poly(latic acid)

The role of alkoxysilanes functional groups for surface modification of TiO2 nanoparticles on non-isothermal crystallization of isotactic polypropylene composites

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