A novel montmorillonite with β-nucleating surface for enhancing β-crystallization of isotactic polypropylene

Dai, Xin; Zhang, Zishou; Wang, Chunguang; Ding, Qian; Jiang, Juan; Mai, Kancheng

doi:10.1016/j.compositesa.2013.01.016

Cited by 54 publications

(33 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the chemical functionalization process, the peak at 1403 cm -1 continues to appear in the FTIR spectra, and a new band at 1575 cm -1 emerged; according to the literature, this observation can be attributed to asymmetric (v asym ) and symmetric (v sym ) stretching vibrations of the carboxylate group (COO -), respectively. Other reports indicate that this band at 1575 cm -1 indicates a bond between pimelic acid molecules and metal ions [24,32]. The last observation and the fact that the IR spectrum of the TiO 2 -PA does not show any changes after being washed with acetone indicate that PA molecules were successfully attached to the TiO 2 surface [8,33,34].…”

Section: Resultsmentioning

confidence: 77%

“…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: 98%

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%

“…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%

See 4 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

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 98%

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

View full text Add to dashboard Cite

show abstract

Polypropylene Nanocomposite Employing Sodium Clay as Support for an Isospecific Metallocene Complex

Fátima

Rocha

Santos

2019

Macromolecular Symposia

View full text Add to dashboard Cite

Propylene polymerization was performed using homogeneous and supported rac‐SiMe2(2‐Me‐Ind)2ZrCl2 catalysts. The supports used were commercial sodic bentonites from different sources. The influence of polymerization time and nature of catalyst support on the nanocomposites syntheses and the consequent properties of obtained composites, were evaluated at two different reaction temperatures and with two cocatalyst systems (MAO and a mixture of MAO/TIBA). The highest catalytic activities were obtained at 60 °C with the cocatalyst mixture MAO/TIBA in the reaction medium. Polymerization rate profiles were obtained as well as melting and crystallization temperatures, crystallinity degree, isotactic index, and number‐average molecular weight. The polypropylene produced with the supported catalyst pretreated with TIBA instead of MAO showed higher crystallinity degree, melting and crystallization temperatures, however, it presented lower catalyst activity. Clay exfoliation was verified by the absence of diffraction peak in the range of 2θ from 2.5° to 7° of X‐ray diffractometry analyses and by transmission electron microscopy. The thermogravimetric analyses showed an increase of PP degradation temperature of above 70 °C when synthesized with clay supported catalysts in relation to the PP obtained by means of homogeneous system.

show abstract

Combined effect of chemically compound graphene oxide‐calcium pimelate on crystallization behavior, morphology and mechanical properties of isotactic polypropylene

Zhang

Lin

2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

The combined nucleation effect of graphene oxide (GO) and calcium pimelate (CaPi) which are chemically compound together (expressed in GO − CaPi) in isotactic polypropylene (iPP) was investigated. Fourier transform infrared (FTIR), X‐ray diffraction (XRD) and thermogravimetric analysis (TGA) verified that CaPi was chemically compound with GO by chelate bonds. The crystallization behavior and crystalline morphologies of iPP nucleated with different mass ratio of GO and CaPi were investigated. The crystallization peak temperature of iPP nucleated with 0.2 wt% GO − CaPi with the mass ratio of 1:5 (GO1 − C5) was increased by 8.3°C when compared with that of pure iPP, and the relative content of β‐crystal reached up to 0.7962. Whereas, the crystallization peak temperature of iPP nucleated with 0.2 wt% GO and CaPi which are blended together by mechanical force (expressed in GO + CaPi) with the mass ratio of 1:5 (GO1 + C5) was only increased by 5.0°C. It was attributed to that the aggregation of GO + CaPi caused the decrease of the crystallization peak temperature, while the GO1 − C5 uniformly dispersed in the iPP matrix. Unexpectedly, the relative content of β‐crystal of iPP nucleated with 0.02 wt% GO1 − C5 reached up to 0.8094, and the crystallization peak temperature was increased by 6.7°C compared with that of pure iPP. Meanwhile, the impact strength, tensile strength and heat deflection temperature of iPP nucleated with 0.02 wt% GO1 − C5 increased by almost 45.86%, 2.03% and 7.7°C, respectively. The iPP nucleated with GO1 − C5 obtained a balance between stiffness and toughness and the thermo‐mechanical property of nucleated iPP was improved.

show abstract

A novel montmorillonite with β-nucleating surface for enhancing β-crystallization of isotactic polypropylene

Cited by 54 publications

References 66 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

Polypropylene Nanocomposite Employing Sodium Clay as Support for an Isospecific Metallocene Complex

Combined effect of chemically compound graphene oxide‐calcium pimelate on crystallization behavior, morphology and mechanical properties of isotactic polypropylene

Contact Info

Product

Resources

About