Thermomechanical environment characterisation in injection moulding and its relation to the mechanical properties of talc-filled polypropylene

Barbosa, Carlos N.; Simões, Ricardo; Franzen, Markus; Viana, J. C.

doi:10.1007/s10853-012-7052-4

Cited by 9 publications

(5 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The statistical analysis of the response to any kind of experiment is a useful tool for probing the incidence [16,[43][44][45]. The numerical values of the response can be then compared to the experimental data.…”

Section: Statistical Analysis and Modelingmentioning

confidence: 99%

“…In the case of polymer matrices such as iPP having poor if any interaction with the nanofillers, surface treatment techniques of the nanoparticles were required as well as specific preparation methods involving the use of compatibilizing agents. Among mineral fillers, talc proved to have a good potential of development for iPP-based composites, noticeably in the automotive industry [13][14][15][16][17]. It appeared very soon that talc displayed a strong nucleating effect for iPP [14,[19][20][21][22][23] due to specific physico-chemical interactions between the filler and the polymer matrix that promote epitaxial crystallization [14,[24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…intermediate size between conventional and nanometric fillers [15][16][17]. Using such filler particles with sub-micronic size enables to increase the specific area of the filler with respect to the former kind of fillers and to overcome the quite common problem of exfoliation and dispersion of the second kind of fillers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimization of the crystallinity of polypropylene/submicronic-talc composites: The role of filler ratio and cooling rate

Makhlouf¹,

Satha²,

Frihi³

et al. 2016

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. Micronic and submicronic mineral fillers recently appeared as efficient reinforcing agents for polyolefins in addition to the benefit of bypassing the exfoliation/dispersion problem encountered in the case of incorporation of nanoscopic fillers such as clay. Submicronic-talc, designated as µ-talc, belongs to this kind of new fillers. This work was aimed at searching to optimize the crystallinity ratio of isotactic polypropylene in the presence of µ-talc in relation to the filler ratio of the composites and the cooling rate from the melt. In order to highlight the efficiency of the µ-talc on the crystallization of polypropylene comparison has been made with PP composites containing conventional talc particles. The study has been carried out on samples having µ-talc weight fractions covering the range 3-30%. In the context of optimizing the crystallinity ratio of the polypropylene matrix in the composites, calorimetric experiments have been planned using a full factorial design. The results were statistically processed by analysis of the variance via mathematical models for predicting the crystallinity ratio in relation to the cooling rate and the filler ratio. Contour graphs have been plotted to determine the effect of each parameter on crystallinity. The cooling rate proved to have a significantly stronger influence on crystallinity than the type and content of filler.

show abstract

Section: Statistical Analysis and Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of the crystallinity of polypropylene/submicronic-talc composites: The role of filler ratio and cooling rate

Makhlouf¹,

Satha²,

Frihi³

et al. 2016

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

“…explained that the poor nucleation ability of bivalent and trivalent salts results from lattice mismatching. Among mineral fillers, talc has been shown to have significant potential for use in PP composites, particularly in the automotive industry, owing to a good balance of rigidity and impact strength, thermal stability, and reduced abrasion during compounding and processing . Furthermore, talc exhibits strong nucleation ability in PP owing to lattice matching between the (001) plane of talc and the (010) plane of α‐form PP crystal, leading to epitaxial growth for PP crystallization …”

Section: Introductionmentioning

confidence: 99%

Enhancement of drawdown force in polypropylene containing nucleating agent

Phulkerd

Nakabayashi

Iwasaki

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

The effect of the nucleation efficiency of three commercial nucleating agents, such as 1,3:2,4‐bis(3,4‐dimethylbenzylidene)sorbitol (DMDBS), sodium 2,2′‐methylene‐bis‐(4,6‐di‐tert‐butylphenyl)phosphate (SMBP), and magnesium silicate (talc), on the melt‐stretching performance of isotactic polypropylene (PP) is studied. It is found that the addition of 0.5 wt % of a nucleating agent enhances the crystallization temperature and that effect is pronounced for DMDBS and SMBP. Furthermore, DMDBS is more efficient than the other tested nucleating agents in enhancing the drawdown force, defined as a force required for stretching a molten strand. Nanofibers of DMDBS, which show significant alignment in the flow direction, are responsible for the rapid crystallization of PP in the flow field leading to an increase of drawdown force. The stretched strand shows a highly oriented structure in which the α‐form crystals orient to the flow direction. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47295.

show abstract

“…For a given material (e.g., polypropylene, PP), the definition and combination of the molding parameters induce a specific morphology across the thickness and along the entire domain of the part [1][2][3][4][5][6]. Also, and as a result of the developed morphology, the molding parameters will determine the mechanical response of the material [7][8][9][10][11][12]. Under well-defined service conditions, namely temperature, load case and strain rate, the mechanical performance of an injection molded part is basically a result of the fundamental molecular nature plus the process induced morphology [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive study on the relationships between the processing, the microstructure, and mechanical properties of injection molded polypropylenes

Barbosa

Simões

Franzen

et al. 2017

Polymer Engineering & Sci

Self Cite

View full text Add to dashboard Cite

The relationship between the morphologies of different injection molded polypropylenes and their tensile properties measured at high strain rate were investigated. A threefold systematic analysis is proposed by establishing the following relationships: (i) processing‐morphology; (ii) processing‐mechanical properties; and (iii) morphology‐mechanical properties. Experimental techniques were used to assess the structural heterogeneity of the moldings, namely: polarized light microscopy (skin thickness), wide‐angle X‐ray scattering (crystallinity, molecular orientation, and polymorphism of the skin layer), and differential scanning calorimetry (bulk crystallinity). High velocity tensile tests (1 m/s) were recorded by a high speed camera that runs 20k frames per second. The influence of multiple processing variables on the morphology and properties was studied adopting a structured statistical approach by means of two statistical tools: analysis of variance and response surface methodology. The most important molding variables and their interactions were identified. Straightforward relationships between the morphology and the tensile properties were established by fitting the experimental data to polynomial equations, using a least‐square minimization procedure. The melt temperature was identified as the most significant variable for the development of the morphologies and the mechanical response of the moldings. The skin thickness, its crystallinity and molecular orientation (flow direction) influence, to a certain degree, the tensile properties of the materials. POLYM. ENG. SCI., 58:E215–E225, 2018. © 2017 Society of Plastics Engineers

show abstract

Thermomechanical environment characterisation in injection moulding and its relation to the mechanical properties of talc-filled polypropylene

Cited by 9 publications

References 19 publications

Optimization of the crystallinity of polypropylene/submicronic-talc composites: The role of filler ratio and cooling rate

Optimization of the crystallinity of polypropylene/submicronic-talc composites: The role of filler ratio and cooling rate

Enhancement of drawdown force in polypropylene containing nucleating agent

Comprehensive study on the relationships between the processing, the microstructure, and mechanical properties of injection molded polypropylenes

Contact Info

Product

Resources

About