Polypropylene Single‐Polymer Composites

Jian, Wang

doi:10.1002/9781119283621.ch7

Cited by 5 publications

(7 citation statements)

References 40 publications

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“…SrCs are also called single-polymer composites. They possess many advantages, such as lightweight, excellent interfacial bonding, high strength, and easy recyclability [ 12 , 13 , 14 , 15 , 16 ]. The main manufacturing process for SrC parts is compression molding [ 13 , 14 , 15 , 17 , 18 , 19 , 20 , 21 ], including hot compaction of fibers/tapes/fabrics, film stacking, coextrusion and compaction.…”

Section: Introductionmentioning

confidence: 99%

Fabric Insert Injection Molding for the Preparation of Ultra-High Molecular Weight Polyethylene/High-Density Polyethylene Two-Component Self-Reinforced Composites

et al. 2022

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The fabric insert injection molding approach can be applied to produce easily recyclable self-reinforced polymer composites (SrCs) whose reinforcement and matrix are from the same polymer. However, the mechanical properties of the SrCs are usually limited due to the poor impregnation of the inserted fabric. In this work, the ultra-high molecular weight polyethylene (UHMWPE) fabrics were used as the insert, and the high-density polyethylene (HDPE) melt was injected to fill the mold cavity and impregnate the fabrics. The UHMWPE/HDPE two-component SrCs were prepared. The large difference of melting temperatures between UHMWPE and HDPE can establish a wide processing temperature window, and thus the impregnation of the fabric can be improved by increasing temperature. The tensile strength and modulus of the UHMWPE/HDPE SrCs were up to 148 and 1132 MPa, respectively. The peel strength could be up to 35.2 N/cm. The influences of four main injection molding parameters, including the injection temperature, injection pressure/packing pressure, injection velocity, and packing time, were investigated. The temperature, pressure, viscosity, and density of the matrix in the mold cavity were calculated by the numerical simulation to indicate the impregnation process during the fabric insert injection molding process.

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Section: Introductionmentioning

confidence: 99%

Fabric Insert Injection Molding for the Preparation of Ultra-High Molecular Weight Polyethylene/High-Density Polyethylene Two-Component Self-Reinforced Composites

et al. 2022

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“…SPC possesses the advantages of low density, good interfacial compatibility, high strength, and easy recyclability [ 1 , 2 , 3 ]. Currently, SPC is becoming of high interest in the field of composites as well as commercial and industrial applications [ 4 ]. The preparation methods of SPC products are mainly based on compression molding [ 1 , 2 , 3 , 4 ], such as the hot compaction of polymer fibers/tapes/fabrics, film stacking, co-extrusion combined with compression.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, SPC is becoming of high interest in the field of composites as well as commercial and industrial applications [ 4 ]. The preparation methods of SPC products are mainly based on compression molding [ 1 , 2 , 3 , 4 ], such as the hot compaction of polymer fibers/tapes/fabrics, film stacking, co-extrusion combined with compression. The compression molding method for SPC production has many disadvantages, such as a narrow temperature window, the difficult controlling of processing temperature, a long molding cycle, and low efficient production.…”

Section: Introductionmentioning

confidence: 99%

Effects of Injection Molding Parameters on Properties of Insert-Injection Molded Polypropylene Single-Polymer Composites

et al. 2021

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The reinforcement and matrix of a polymer material can be composited into a single polymer composite (SPC), which is light weight, high strength, and has easy recyclability. The insert injection molding process can be used to realize the multiple production of SPC products with a short cycle time and wide processing temperature window. However, injection molding is a very complicated process; the influence of several important parameters should be determined to help in the future tailoring of SPCs to specific applications. The effects of varying barrel temperature, injection pressure, injection speed, and holding time on the properties of the insert-injection molded polypropylene (PP) SPC parts were investigated. It was found that the sample weight and tensile properties of the PP SPCs varied in different rules with the variations of these four parameters. The barrel temperature has a significant effect, followed by the holding time and injection pressure. Suitable parameter values should be determined for enhanced mechanical properties. Based on the tensile strength, a barrel temperature of 260 °C, an injection pressure of 127.6 MPa, an injection speed of 0.18 m/s, and a holding time of 60 s were determined as the optimum processing conditions. The best tensile strength and peel strength were up to 120 MPa and 19.44 N/cm, respectively.

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“…[4][5][6] In most SPC instances, the matrix and reinforcement have basically the same chemical structure and hence melting temperature, the main challenge in producing SPC system, is to establish a processing temperature window. 7 The preparation methods or processes of SPCs were gradually developed, 8 including hot compaction, film stacking, coextrusion, and injection molding. Plenty of research work reported hot compaction.…”

Section: Introductionmentioning

confidence: 99%

“…41 Over the past 30 years, the SPCs concept has been extensively investigated with PP. 8 The unidirectional continuous fiber as the reinforcement would play a good role in the improvements of mechanical properties. The important parameter, die temperature, was specially discussed, and the influence of fiber content and the fiber distribution on the tensile properties of the PP SPCs were also investigated.…”

Section: Introductionmentioning

confidence: 99%

Unidirectional continuous fiber-reinforced polypropylene single-polymer composites prepared by extrusion–calendering process

Jian

Song

2019

Journal of Thermoplastic Composite Materials

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An extrusion–calendering process was developed to continuously manufacture unidirectional continuous fiber-reinforced polypropylene single-polymer composites (PP SPCs). The process combined “undercooling” property of the matrix and “overheating” property of the fiber, which can not only establish a wide processing temperature window but also enhance the mechanical properties of the final SPCs. The best tensile strength and modulus of the PP SPCs with only 5 wt% fiber content were up to 53.34 ± 3.56 MPa and 1.81 ± 0.14 GPa, 2 times and 1.59 times higher than those of pure PP, respectively, and they also exceeded the theoretical values due to the high performance of the uniaxial fibers and the optimized process. The influences of the die temperature, fiber contents, and fiber distribution were studied. Scanning electron microscopy was also used to observe the morphological properties of the PP SPCs.

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Polypropylene Single‐Polymer Composites

Cited by 5 publications

References 40 publications

Fabric Insert Injection Molding for the Preparation of Ultra-High Molecular Weight Polyethylene/High-Density Polyethylene Two-Component Self-Reinforced Composites

Fabric Insert Injection Molding for the Preparation of Ultra-High Molecular Weight Polyethylene/High-Density Polyethylene Two-Component Self-Reinforced Composites

Effects of Injection Molding Parameters on Properties of Insert-Injection Molded Polypropylene Single-Polymer Composites

Unidirectional continuous fiber-reinforced polypropylene single-polymer composites prepared by extrusion–calendering process

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