Enhanced orientation of the water-assisted injection-molded ipp in the presence of nucleating agent

2012 ◽  
Vol 52 (4) ◽  
pp. 725-732 ◽  
Author(s):  
Guo-Qiang Zheng ◽  
Zhenhua Jia ◽  
Xianhu Liu ◽  
Baochen Liu ◽  
Xiaoli Zhang ◽  
...  
Keyword(s):  
Nucleating Agent ◽  
Injection Molded

Morphology design of isotactic polypropylene composites

2017 ◽  
Vol 31 (9) ◽  
pp. 1252-1262
Author(s):  
Shiwei Wang ◽  
Yuting Leng ◽  
Guangan Zhang ◽  
Ruonan Wang ◽  
Shuaijiang Ma ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
High Performance ◽  
Polarized Light ◽  
Nucleating Agent ◽  
Interfacial Region ◽  
Polypropylene Composites ◽  
Composites Materials ◽  
High Performance Polymer ◽  
Injection Molded ◽  
New Perspective

In this article, the high-performance polymer composites were prepared based on the morphology designing method. To begin with, the beta transcrystalline morphology in the interfacial region of isotactic polypropylene (iPP) composites supported by single carbon fiber was formed by the induction of beta nucleating agent (NA) and verified using the polarized light microscopy. Then, to further explore the application of the beta transcrystalline morphology, the way of induction by supported NA was introduced into the iPP injection-molded samples. The result showed that a certain number of interfacial beta transcrystallinity was formed in the adjacent region of carbon nanotubes–modified iPP injection-molded samples. Herein, the mechanical properties are closely related to the interfacial beta transcrystalline morphology, the convective evidence was the improvement of the sample’s impact strength by seven times. Therefore, this work gives a new perspective for the preparation of high-performance composites materials via morphology designing.

scholarly journals Comparison of the efficiency of the most effective heterogeneous nucleating agents for Poly(lactic acid)

2021 ◽  
Author(s):  
Tatyana Ageyeva ◽  
József Gábor Kovács ◽  
Tamás Tábi
Keyword(s):  
Lactic Acid ◽  
Tensile Modulus ◽  
Charpy Impact ◽  
Nucleating Agent ◽  
Poly Lactic Acid ◽  
Nucleating Agents ◽  
Scanning Calorimetry ◽  
Injection Molded ◽  
Heat Deflection Temperature ◽  
Charpy Impact Strength

AbstractWe selected the thirteen most effective nucleating agents for Poly(lactic acid) (PLA) from the literature, and synthesized and compounded them with two different PLA grades: 3001D (1.4% D-lactide content) and 3100HP (0.5% D-lactide content, considered PLLA). We determined the crystallinity and crystallization of PLA with different nucleating agents in identical conditions (same nucleating agent content, same cooling rate) with the help of differential scanning calorimetry. We compared the efficiency of each nucleating agent and found that for both PLA grades, Zinc PhenylPhosphonate was the most effective. However, even when nucleated PLA was injection molded into a cold mold (25 °C), it still could not fully crystallize during cooling and the heat deflection temperature did not increase significantly. The maximum achieved crystallinity, in this case, was between 32.4 and 35.7%. On the contrary, when a 90 °C “hot mold” and in-mold crystallization together were applied, the specimens achieved full crystallization during the injection molding cycle (crystallinity was between 44.5 and 50.0%), and the heat deflection temperature increased to an average of 88.8 °C. We also examined the mechanical properties of the nucleated PLA and found that the usage of nucleating agents together with a hot mold improved tensile strength, tensile modulus, and Charpy impact strength but decreased elongation at break.

scholarly journals From disposal to sustainable development: technological potential of poly(lactic acid) (PLA) blends with 3D filament waste

2020 ◽  
Vol 9 (12) ◽  
pp. e13291210767
Author(s):  
Wellerson Salomão Diniz Marinho ◽  
Carlos Bruno Barreto Luna ◽  
Edcleide Maria Araújo ◽  
Carlos Heitor de Andrade Lustosa ◽  
Celso Rosendo Bezerra Filho ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Softening Temperature ◽  
Nucleating Agent ◽  
Degree Of Crystallinity ◽  
Poly Lactic Acid ◽  
Continuous Growth ◽  
Technological Potential ◽  
Twin Screw ◽  
Injection Molded ◽  
The Degree Of Crystallinity

Additive manufacturing is growing rapidly in the automotive, medical, and aerospace industries as an option for the manufacturing of products. However, there is a continuous growth in the amount of waste generated by 3D filaments, thus, the reuse practice becomes important, since it brings environmental and economic gains. The present research evaluated the mechanical, thermal, thermomechanical and rheological properties of PLA/PLAr blends containing post-consumption 3D filament. The blends were prepared in a co-rotational twin screw extruder and, subsequently, the extruded granules were injection molded. As the PLAr content in the blends (PLA/PLAr) increased, there was a reduction in viscosity, indicating an improvement in manufacturability. The PLA/PLAr blend (75/25 % wt.) increased the degree of crystallinity compared to neat PLA, indicating that PLAr acted as a nucleating agent. As a consequence, the PLA/PLAr blend (75/25 % wt.) showed performance comparable to neat PLA in thermal stability, elastic modulus, tensile strength, Shore D hardness, impact strength, heat deflection temperature (HDT) and Vicat softening temperature. The reuse of post-consumption 3D filament PLA is feasible for the development of materials with good properties. In addition, value is added to the post-consumption material and there is a contribution to sustainable development.

scholarly journals Development of Sustainable and Cost-Competitive Injection-Molded Pieces of Partially Bio-Based Polyethylene Terephthalate through the Valorization of Cotton Textile Waste

2019 ◽  
Vol 20 (6) ◽  
pp. 1378 ◽  
Author(s):  
Sergi Montava-Jordà ◽  
Sergio Torres-Giner ◽  
Santiago Ferrandiz-Bou ◽  
Luis Quiles-Carrillo ◽  
Nestor Montanes
Keyword(s):  
Thermal Resistance ◽  
Polyethylene Terephthalate ◽  
Textile Industry ◽  
Food Packaging ◽  
Nucleating Agent ◽  
Short Fibers ◽  
Cotton Waste ◽  
Twin Screw ◽  
Injection Molded ◽  
Pet Crystallization

This study presents the valorization of cotton waste from the textile industry for the development of sustainable and cost-competitive biopolymer composites. The as-received linter of recycled cotton was first chopped to obtain short fibers, called recycled cotton fibers (RCFs), which were thereafter melt-compounded in a twin-screw extruder with partially bio-based polyethylene terephthalate (bio-PET) and shaped into pieces by injection molding. It was observed that the incorporation of RCF, in the 1–10 wt% range, successfully increased rigidity and hardness of bio-PET. However, particularly at the highest fiber contents, the ductility and toughness of the pieces were considerably impaired due to the poor interfacial adhesion of the fibers to the biopolyester matrix. Interestingly, RCF acted as an effective nucleating agent for the bio-PET crystallization and it also increased thermal resistance. In addition, the overall dimensional stability of the pieces was improved as a function of the fiber loading. Therefore, bio-PET pieces containing 3–5 wt% RCF presented very balanced properties in terms of mechanical strength, toughness, and thermal resistance. The resultant biopolymer composite pieces can be of interest in rigid food packaging and related applications, contributing positively to the optimization of the integrated biorefinery system design and also to the valorization of textile wastes.

scholarly journals Poly(Acrylonitrile–Butadiene–Styrene) as a Special β-Nucleating Agent on the Toughness of Isotactic Polypropylene

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1894
Author(s):  
Jingru Liu ◽  
Xinxu Zhu ◽  
Zheng Cao
Keyword(s):  
Isotactic Polypropylene ◽  
Acrylonitrile Butadiene Styrene ◽  
Nucleating Agent ◽  
Scanning Calorimetry ◽  
Molding Method ◽  
Stress Transmission ◽  
Injection Molded ◽  
The Impact ◽  
Poly Acrylonitrile ◽  
Butadiene Styrene

The influence of poly(acrylonitrile–butadiene–styrene) (ABS) as a special β-nucleating agent on the impact and tensile properties of isotactic polypropylene (iPP) were investigated by dynamic rheological measurements, wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and mechanical properties tests. It is found that the β nucleation efficiency of ABS is closely related to its concentration, dispersibility, and molding method for the iPP/ABS blends. The content of β-crystal (Kβ) rises with the incorporation of ABS and shows a maximum with the introduction of 1% ABS for compression-molded blends and 2% ABS for injection-molded blends, respectively, which is followed by a decrease in Kβ. The addition of a small amount of ABS has a significant reinforcing and toughening effect on iPP. Compared with the compression-molded samples, the ABS dispersed phase in injection-molded samples has a smaller particle size and a larger specific surface area, which are favorable for stress transmission and higher β nucleation efficiency, and therefore, better tensile and impact properties can be expected.

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