Effect of inhomogeneous mold cavity surface temperature rapid self-cooling on β phase contents and mechanical properties of injection-molded polypropylene

Zou, Dejian; Tongmin, Yu; Duan, Chunzheng

doi:10.1016/j.tca.2022.179197

Cited by 1 publication

(2 citation statements)

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“…In addition, the χ c of PA6/CNT composites obtained from Cycle 3 (i.e., second heating cycle) was slightly higher than that of Cycle 1 (first heating cycle), suggesting that the thermomechanical history during melt processing had an influence on the crystallization of polymer chains. Moreover, the values of T c followed a trend of μIM > CIM > CM, which further suggested that higher shearing effect facilitated the crystallization of polymer melts 58,59 . As a result, the second heating cycle χ c for injection molded PA6/CNT composites was higher than that of CM counterparts.…”

Section: Resultsmentioning

confidence: 83%

“…Moreover, the values of T c followed a trend of μIM > CIM > CM, which further suggested that higher shearing effect facilitated the crystallization of polymer melts. 58,59 As a result, the second heating cycle χ c for injection molded PA6/CNT composites was higher than that of CM counterparts. The TGA and DTG curves of extruded and μIM PA6/CNT composites were given in Figure 7.…”

Section: Thermal Analysismentioning

confidence: 97%

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Properties of polyamide 6/multiwalled carbon nanotubes composites: The influence of processing methods

Xue

Liang

Zou

et al. 2022

J of Applied Polymer Sci

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The objective of this work was to elucidate the influence of shear rates on the properties of polyamide 6/multiwalled carbon nanotube (PA6/CNT) composites which was realized by adopting different types of processing methods that feature different orders of magnitude in shear rates, such as compression molding (CM, $0 s À1 ), conventional injection molding (CIM, $10 2 s À1 ) and microinjection molding (μIM, $10 5 s À1 ). Electrical conductivity (σ) results indicated that the prevailing high shearing conditions in injection molding was unfavorable for the formation of intact filler network, thereby resulting in a much lower σ than CM counterparts. Moreover, the σ of PA6/CNT microparts was higher than that of CIM macroparts when the filler content was less than 5 wt%, otherwise the σ of CIM macroparts prevailed over that of μIM counterparts. A better filler distribution was observed when PA6/CNT composites were processed under higher shearing conditions, as corroborated by SEM. In addition, CNTs were preferentially aligned along flow direction and a higher degree of CNT orientation was expected with increasing shear rates, as confirmed by Raman spectral analysis. The tensile strength of injection molded PA6/CNT samples increased with increasing filler concentrations, and the more preferential orientation and better distribution of CNT were considered to be the contributing factors. The comparative study of the properties of PA6/CNT composites that processed using different methods was important for their practical applications in industrial sectors.

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Section: Resultsmentioning

confidence: 83%

Section: Thermal Analysismentioning

confidence: 97%