Non‐isothermal crystallization kinetics of cork‐polymer composites for injection molding

Silva, Sara P. Magalhães da; Lima, Paulo S.; Oliveira, José M.

doi:10.1002/app.44124

Cited by 15 publications

(15 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They further explained that during the cooling stage of DSC, there was a lack of visible changes in the crystalline structure of PP J o u r n a l P r e -p r o o f composites with or without natural fillers. The results obtained and observation from this study were in agreement with other previous studies (Magalhães da Silva, Lima, & Oliveira, 2016;Fernandes, Correlo, Mano, & Reis, 2014). As observed in the above studies, having natural reinforcements in the polymeric matrix can alter the DSC characteristics of the composites.…”

Section: Figure 5 a Typical Plot To Identify Tg Tc And Tmsupporting

confidence: 94%

Recent advances in thermal properties of hybrid cellulosic fiber reinforced polymer composites

Krishnasamy

Thiagamani

Kumar

et al. 2019

International Journal of Biological Macromolecules

View full text Add to dashboard Cite

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

show abstract

Section: Figure 5 a Typical Plot To Identify Tg Tc And Tmsupporting

confidence: 94%

Recent advances in thermal properties of hybrid cellulosic fiber reinforced polymer composites

Krishnasamy

Thiagamani

Kumar

et al. 2019

International Journal of Biological Macromolecules

View full text Add to dashboard Cite

show abstract

“…In non-isothermal crystallization, the temperature can be replaced by time according to equation [33]:t=false(To−Tfalse)/Φ where To is the onset crystallization temperature, T is the crystallization temperature at time t, and Φ is the cooling rate.…”

Section: Resultsmentioning

confidence: 99%

Non-Isothermal Crystallization Kinetics of Short Glass Fiber Reinforced Poly (Ether Ether Ketone) Composites

Yang

Wei

et al. 2018

Materials

View full text Add to dashboard Cite

Due to its excellent chemical and temperature resistances, short glass fiber reinforced poly (ether ether ketone) composite (SGF/PEEK) is a promising material for application in automotive lightweight. Processing conditions, such as cooling rate, need to be well controlled to obtain the optimal crystallite morphology of PEEK composites. Thus, in this paper, the non-isothermal crystallization kinetics and melting behavior of SGF/PEEK were investigated by differential scanning calorimetry (DSC) at different cooling rates, and the crystallite sizes were evaluated by the X-ray diffraction technique (XRD). Crystallization kinetics models and effective activation energies were evaluated to determine the crystallization parameters of the composites. The results suggest that a lower cooling rate enlarges the size of crystallites and enhances the uniformity of size distribution. The addition of glass fibers improves the nucleation rate owing to heterogeneous nucleation while decreasing the growth rate due to retarded movement of the polymer chain. The combined Avrami-Ozawa equation was shown to describe accurately the non-isothermal crystallization. The absolute value of the crystallization activation energy for SGF/PEEK is lower than that of pure PEEK.

show abstract

“…of plastic products, fillers are added in the polymeric matrix. For instance, colorants, plasticizers, lubricants, antioxidants are commonly used in plastic packaging [4][5][6], and flame retardants are commonly used in plastic for electronics [7,8]. With the introduction of fillers during the process, the plastic part fulfills the requirements for the use in specific applications, but, at the same time, it reduces the sustainability of the plastic products [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Rapid Mold Heating on the Structure and Performance of Injection-Molded Polypropylene

et al. 2020

View full text Add to dashboard Cite

The tailoring by the process of the properties developed in the plastic objects is the more effective way to improve the sustainability of the plastic objects. The possibility to tailor to the final use the properties developed within the molded object requires further understanding of the relationship between the properties of the plastic objects and the process conduction. One of the main process parameters that allow adjusting the properties of molded objects is the mold temperature. In this work, a thin electrical heater was located below the cavity surface in order to obtain rapid and localized surface heating/cooling cycles during the injection molding process. An isotactic polypropylene was adopted for the molding tests, during which surface temperature was modulated in terms of values and heating times. The modulation of the cavity temperature was found able to control the distribution of relevant morphological characteristics, thus, properties along the sample thickness. In particular, lamellar thickness, crystallinity distribution, and orientation were analyzed by synchrotron X-ray experiments, and the morphology and elastic modulus were characterized by atomic force microscopy acquisitions carried out with a tool for the simultaneous nanomechanical characterization. The crystalline degree slightly increased with the cavity temperature, and this induced an increase in the elastic modulus when high temperatures were adopted for the cavity surface. The cavity temperature strongly influenced the orientation distribution that, on its turn, determined the highest values of the elastic modulus found in the shear layer. Furthermore, although the sample core, not experiencing a strong flow field, was not characterized by high levels of orientation, it might show high values of the elastic modulus if temperature and time during crystallization were sufficient. In particular, if the macromolecules spent adequate time at temperatures close to the crystallization temperature, they could achieve high levels of structuring and, thus, high values of elastic modulus.

show abstract

Non‐isothermal crystallization kinetics of cork‐polymer composites for injection molding

Cited by 15 publications

References 50 publications

Recent advances in thermal properties of hybrid cellulosic fiber reinforced polymer composites

Recent advances in thermal properties of hybrid cellulosic fiber reinforced polymer composites

Non-Isothermal Crystallization Kinetics of Short Glass Fiber Reinforced Poly (Ether Ether Ketone) Composites

Effect of Rapid Mold Heating on the Structure and Performance of Injection-Molded Polypropylene

Contact Info

Product

Resources

About