Thermal properties and crystallization kinetics of a new polypropylene–polyamide 6 composite

Zhang, Kaizhou; Wu, Bin; Shao, Huiju; Yang, Jian; Qin, Shuhao

doi:10.1177/0892705715599433

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…The crystallization kinetics of both polymer and TPVs are particularly important for the analysis and design of processing operations, which would be able to crystallize not only when cooled from the melt but also when heated from the amorphous state. [22][23][24][25][26][27] The former is so-called "melt crystallization" and the latter one is "cold crystallization. "…”

Section: Introductionmentioning

confidence: 99%

Nonisothermal crystallization behaviors of ethylene–acrylic acid copolymer and ethylene–acrylic acid copolymer/chloroprene rubber thermoplastic vulcanizate

Liu

Shan

Wang

2020

Journal of Thermoplastic Composite Materials

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Nonisothermal crystallization kinetics of ethylene–acrylic acid copolymer (EAA) and thermoplastic vulcanizate (TPV) based on EAA/chloroprene rubber (CR) were extensively studied using differential scanning calorimetry. Several methods, including the Avrami, Ozawa, and Mo equations, were carried out to analyze the process of nonisothermal crystallization kinetics of EAA and EAA/CR TPV. The results showed that the Avrami analysis modified by Jeziorny and a method developed by Mo could describe the nonisothermal crystallizations of pure EAA and the EAA/CR TPV very well. However, the Ozawa analysis did not give an adequate description. The crystallization processes of pure EAA and the EAA/CR TPV were accelerated by increasing the cooling rates. Moreover, the initial crystallization temperature and the crystallization termination temperature of EAA/CR TPV were higher than those of pure EAA at the same cooling rate, thus showing the nucleating function of CR in the beginning. While the crystallization half time of EAA/CR TPV was apparently longer than that of pure EAA, meaning that the more CR could cause the steric effect and retard the crystallization process of the TPV during the late stages of crystallizing. Although the CR phase of EAA/CR TPV could provide more nucleation sites, the presence of more CR phase must impose a much more significant confinement effect on the crystal growth of EAA. It was believed that this confinement effect overweighed the nucleation effect, thereby slowing down the overall crystallization rate.

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Section: Introductionmentioning

confidence: 99%

Nonisothermal crystallization behaviors of ethylene–acrylic acid copolymer and ethylene–acrylic acid copolymer/chloroprene rubber thermoplastic vulcanizate

Liu

Shan

Wang

2020

Journal of Thermoplastic Composite Materials

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“…46 As listed in Table 2, the value of F(T) increased gradually with increasing X c , indicating that the cooling rate has to be increased to obtain an increased crystallinity for a fixed time period. 49 For the same relative crystallinity, the F(T) value of reactive blends is lower than that of PA6, and decreased with increasing ABS content. The ABS/PA6 reactive blends had a higher crystallization rate than that of PA6.…”

Section: Resultsmentioning

confidence: 92%

“…Increased value of F ( T ) indicated a decreased crystallization rate because F ( T ) is described as a cooling rate value . As listed in Table , the value of F ( T ) increased gradually with increasing X c , indicating that the cooling rate has to be increased to obtain an increased crystallinity for a fixed time period . For the same relative crystallinity, the F ( T ) value of reactive blends is lower than that of PA6, and decreased with increasing ABS content.…”

Section: Resultsmentioning

confidence: 97%

Rheological and Crystallization Properties of ABS/PA6-Compatibilized Blends via In Situ Reactive Extrusion

Zhao

Yan

et al. 2020

ACS Omega

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ABS/PA6-compatibilized blends were prepared by in situ reactive extrusion method. The main objective was to evaluate the influences of the morphology and blend composition on the rheological and nonisothermal crystallization properties. The morphology of submicron-sized ABS droplets evenly dispersed in PA6 led to dilatant fluid behavior and a transition from elastic to viscous behavior in the low-frequency region. The crystallization results indicated that reactive blends had elevated crystallization temperatures and crystallization rates, which were due to the heterogeneous nucleation of the submicron-sized ABS particles. In addition, it was observed that the theory by Mo suitably described the nonisothermal crystallization process. The activation energy slightly decreased for ABS contents of 5 and 15 wt % and then increased for a content of 25 wt %, indicating that the ABS promoted the crystallization of the blends at appropriate contents.

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“…The addition of inorganic halide salts to the polyamides was considered to be an effective way to reduce the melting point of polyamides . Lithium chloride (LiCl) was introduced to depress the melting temperature of polyamide 6/wheat straw composites; however, the granules of composites had to be heated at 250°C for 15–25 min, due to the processing limitations of the lab scale Ray Ran injection molding device.…”

Section: Introductionmentioning

confidence: 99%

Effects of LiCl on crystallization, thermal, and mechanical properties of polyamide 6/wood fiber composites

Sun

He³

et al. 2017

Polymer Composites

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In the presented study, lithium chloride (LiCl) was used as a modifier to reduce the melting point of polyamide 6 (PA6) and low melting point PA6/wood fiber composites (LPA6/WFC) were prepared with a hot‐press machine. Non‐isothermal crystallization analysis revealed that as little as 3 wt% LiCl decreased the crystallinity of LPA6/WFC from 21.43% to approximately 10% and reduced the melting point of composites from above 220°C to below 200°C, hence the composites can be produced industrially as well as severe degradation of wood fibers can be avoided. Both LiCl and wood fibers increased the glass transition temperature (Tg) of LPA6/WFC, and the Tg of the composites can reach up to 83.2°C, indicating that composites subjected to high temperature circumstances can still retain good dimensional stability and rigidity. In addition, the composites exhibited good mechanical properties, revealed by a flexural strength of the composites of up to 92 MPa. POLYM. COMPOS., 39:E1574–E1580, 2018. © 2017 Society of Plastics Engineers

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Thermal properties and crystallization kinetics of a new polypropylene–polyamide 6 composite

Cited by 7 publications

References 26 publications

Nonisothermal crystallization behaviors of ethylene–acrylic acid copolymer and ethylene–acrylic acid copolymer/chloroprene rubber thermoplastic vulcanizate

Nonisothermal crystallization behaviors of ethylene–acrylic acid copolymer and ethylene–acrylic acid copolymer/chloroprene rubber thermoplastic vulcanizate

Rheological and Crystallization Properties of ABS/PA6-Compatibilized Blends via In Situ Reactive Extrusion

Effects of LiCl on crystallization, thermal, and mechanical properties of polyamide 6/wood fiber composites

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