Polytetrafluoroethylene Nanofiber Research Articles

A simple and efficient approach for pore structure optimization and hydrophilic modification of PTFE nanofiber membrane

Polytetrafluoroethylene (PTFE) membranes have great potential for treating wastewater in harsh environment due to their excellent stability. However, difficulties in the pore structure optimization and functional modification of biaxial stretched PTFE membrane have limited its further applications in liquid separation. Herein, we presented a simple and efficient approach for the preparation and hydrophilic modification of electrospun PTFE nanofiber membranes. This method involved optimizing the pore structure of PTFE nanofiber membranes through adjusting the mass ratio of the spinning carrier polyethylene oxide (PEO) and PTFE, followed by introducing the acetalized polyvinyl alcohol (PVA) on the membrane’s pore surface to improve the hydrophilicity. The average pore size changed from 288.5 to 161.3 nm, while the water contact angle reduced from 135.7° to 50.9°, which not only increased the water permeate flux from 68.56 to 1056.16 L·m−2·h−1, but also achieved high rejection rates of 99.3 % and 97.3 % for carbon (1 μm) and SiO2 (100 nm) particles respectively. Meanwhile, the obtained PTFE nanofiber membrane also exhibited excellent hydrophilic stability after long term exposure to harsh environments (pH=2 HCl, pH=12 NaOH, 1000 ppm NaClO) and 100 friction cycles (5 g weights on 1000 mesh sandpaper). This approach of preparing hydrophilic PTFE nanofiber membranes showed significant potential for practical applications in wastewater treatment.

High-strength, impact-resistant PP/PTFE composite foam with enhanced surface appearance achieved through mold-opening microcellular injection molding

Poor surface appearance and decreased mechanical performance are critical factors limiting the broad application of Microcellular injection molding (MIM) in foamed polymer products. Herein, in-situ polytetrafluoroethylene (PTFE) nanofibrils reinforced polypropylene (PP) foams with high strength, impact resistance, and enhanced surface quality were prepared by mold opening microcellular injection molding (MOMIM). PTFE nanofibers with different diameters were introduced into the PP matrix via twin screw extrusion and significantly enhanced the crystallinity and viscoelasticity of the PP matrix with the enhancement being more pronounced for the finer PTFE fibers. High-density oriented cellular structures were formed in the MOMIM PP/PTFE foams owing to the heterogeneous nucleation of PTFE and the stretching effect of the mold opening process. The optimum MOMIM PP/PTFE foam fabricated possesses a high cell orientation angle close to 90° and a large cell aspect ratio of 5.3, which reached a 34.37 % increase in tensile strength and a 73.08 % increase in impact strength owing to the synergetic effects of the PTFE network and the highly oriented fine cell structure, which effectively dissipated the tensile stress and impact stress by cell wall twisting and folding deformation. Furthermore, the MOMIM PP/PTFE foam showed a significantly enhanced surface quality compared to the MIM foam due to the reduced dragging flow in MOMIM, which greatly hindered cell rupture on the foam surface. Therefore, this work provides insights into the MOMIM of polymer composites containing fibrous fillers and the enhancement of tensile properties, impact resistance, and surface quality of foam products.

Mass-Producible Hybrid Polytetrafluoroethylene Nanofiber Mat with Radial Island-Chain Architecture as Anti-pathogen Cloth in Individual Protection

Mass-Producible Hybrid Polytetrafluoroethylene Nanofiber Mat with Radial Island-Chain Architecture as Anti-pathogen Cloth in Individual Protection

Piezoelectric PMS activation by ZnO embedded polytetrafluoroethylene membrane for efficient degradation of carbamazepine

The wide-spread micropollutants in water have posed severe risks to human health and eco-environment. However, the current treatment techniques generally suffer from low efficiency, high cost and unpractical application feasibility. In this study, a piezoelectric membrane was fabricated by embedding zinc oxide (ZnO) nanorods with several micrometer length into polytetrafluoroethylene nanofiber membrane and applied for the removal of carbamazepine (CBZ) from water. After the sintering, the prepared membrane showed a narrower pore size distribution with the average pore size of ∼1.7 µm. The addition of ZnO nanorods could significantly improve the piezoelectric property of the membrane. During the membrane filtration, the peroxymonosulfate could be effectively activated by the prepared piezoelectric membrane with 2 % ZnO dosage to generate free radicals, achieving about 83.1 % of CBZ from water. According to the radical quenching tests and electron spin-resonance analysis, the hydroxyl radical, sulfate radical, singlet oxygen and superoxide radical greatly participated in the CBZ removal. The CBZ removal efficiency in the US/PMS/PTFE@ZnO-2 system was decreased by 18.2 % after continuous 5-cycle operation, but the performance could be easily renewed by methanol rinsing, demonstrating its attractive reusability and application potential on the efficient removal of micropollutants from water.

Cross-Aligned PTFE Nanofiber Reinforced Composite Membrane for PEM Fuel Cells

Polymer electrolyte membrane fuel cells (PEMFCs) have widely been considered environmental friendly alternative energy technologies due to their high energy conversion efficiency and zero emission. In the recent, the importance of performance and durability of electrolyte membrane, interfacial layer separating two electrodes, prohibiting fuel cross-over, while transporting only protons, has become much crucial for utilizing PEMFCs to the automobile applications such as fuel cell electric vehicles (FCEVs) and drones.Unfortunately, the current state membranes, mainly composed of perfluorosulfonic acid (PFSA) ionomers, have suffered from the high cost and low proton conductivity, and low dimensional stability during dynamic humidity changes during fuel cell operation. In order to deal with these issues, recently, a reinforced composite membranes (RCMs) have been developed in which a PFSA ionomer is impregnated into a porous support matrix consisted with nanofibrous polymer materials such as polytetrafluoroethylene (PTFE) due to their thermal/mechanical robustness. The PTFE based RCMs could provide enhanced mechanical stability and electrochemical performance with a reduced use of PFSA ionomer, but low impregnation of ionomers into nanosized hydrophobic PTFE networks, resulting in phase separation and irreversible creep deformation.Herein, we report a novel preparation of vertically alined PTFE aggregated fibers (PTFE AFs) as a reinforcement by using facile electrospinning hetero-polymer solutions containing PTFE nanoparticles and PEO (Polyethylene oxide) carrier polymer and subsequent thermal removal of PEO. Developed PTFE AF were effectively soaked by PFSA ionomers, and PTFE AF based RCMs delivered outstanding dimensional stability and proton conductivity compared to commercial RCMs. Furthermore, PTFE AF based RCMs used MEA exhibited exceptional single-cell performance and long-term stability. The enhanced performance was attributed to the facile proton conduction through the one dimensional channels between aligned fibers without fiber scattering, and effective suppression of volume expansion of hydrated PFSA ionomer by rectangular shaped PTFE fiber network. We believe the widespread use of novel PTFE fiber based membranes with an unique pattern in a variety of membrane applications where porous supports are used. Figure 1

Construction of a three-dimensional network in branched PETG to prepare PETG composite microcellular foam with outstanding mechanical properties at low temperatures

In response to the escalating demands in cold chain logistics, in this study, we developed a high-compression strength foam resistant to low temperatures using a proficient and accessible approach. The microcellular foam was prepared through chain modification and in situ-fibrillated technology of polytetrafluoroethylene (PTFE). An epoxy chain extender, ADR4468, was incorporated to enhance the foamability of poly(ethylene glycol-co-cyclohexane-1,4-dimethanol terephthalate) (PETG). In addition, chain-extended PETG (CEPETG)–PTFE nanocomposites were formulated by integrating a PTFE three-dimensional (3D) nanofiber network. The PTFE nanofiber serves as an effective nucleation agent owing to its large specific surface area and undergoes a crystal-shaped transformation to further augment its strength. By leveraging the synergistic influence of these two principles, we employed the scCO2 foaming technology to obtain CEPETG–PTFE nanocomposite microcellular foam, which exhibited high-compression strength at low temperatures. The introduction of the chain extender improved the foaming characteristics of PETG. Consequently, the expansion ratio of the PETG foam increased from 5.18 to 36.01. Moreover, the formation of the PTFE 3D nanofiber network decreased the cell size from 16.16 to 2.38 μm. Furthermore, the low-temperature compression of the foam increased by 266 %, with an improvement in its toughness.

Electrospun PTFE nanofibrous composite membranes featuring a fiber network structure for organic solvent nanofiltration (OSN)

The practical implementation of organic solvent nanofiltration (OSN) was still hindered by the drawback of substrate swelling and dissolution in organic solvents. As the substrate of nanofiltration membranes, polytetrafluoroethylene (PTFE) had gained increasing attention due to its stable chemical characteristics. However, it was difficult to construct functional nanofiltration layers on the surface of PTFE due to its hydrophobicity induced by its intrinsic low surface energy, resulting into poor adhesion between substrate and functional layer. In this study, a polydopamine (PDA)-PA/PTFE composite nanofiltration membrane with a three-layer was fabricated by utilizing the poly (tetrafluoroethylene-hexafluoropropylene) (FEP) resins as the pore structure regulator of the PTFE substrate with fiber network structure, and PDA as the surface modifier of the PTFE substrate. The resultant composite nanofiltration membrane exhibited a notable rejection rate of 96.26 % for Rose Bengal (RB), and a long-term stable ethanol permeance of 2.28 (L·m−2·h−1·bar−1). After continuous filtration for 48 h, soaking in polar organic solvents (DMF) for 20 days, and circulating experiments exhibiting excellent solvent resistance and long-term stability. These results provided a useful strategy for the application of PTFE nanofiber substrates in the OSN field.

A simple and effective approach to regulate and control pore structure of electrospun PTFE nanofiber membrane

Owing to its outstanding hydrophobicity, thermal stability, and chemical resistance, polytetrafluoroethylene (PTFE) has always been the ideal material in the field of membrane contactors. However, the pore structure regulation of the PTFE membrane is challenging due to its poor processability. Herein, a novel and simple strategy to adjust the pore structure of the electrospun PTFE nanofiber membrane was proposed by introducing sodium alginate (SA) into the PTFE/PVA spinning solution. The pore structure of the PTFE nanofiber membrane gradually changed from the nanofiber network to the “sea-island” structure with the increase of SA addition from 0 to 2.5 %, which brought about a decrease in membrane pore size from 1.49 to 0.58 μm. Meanwhile, with the increase of SA addition, there was an obvious improvement in the mechanical properties of obtained PTFE nanofiber membrane because of the higher packing density of PTFE/PVA/SA precursor nanofiber. Finally, the obtained PTFE nanofiber membrane was utilized in the membrane emulsification (ME) process, which exhibited excellent emulsion performance in terms of 0.30 μm average droplet size of Water-in-oil (W/O) emulsion (remaining stable for 30 days).

Superhydrophobic electrospun FPI/PTFE nanofiber membranes for robust vacuum membrane distillation

In this study, we firstly proposed a fluorinated polyimide (FPI) /polytetrafluoroethylene (PTFE) nanofiber membrane for vacuum membrane distillation (VMD) by electrospinning FPI and double eletcrospraying PTFE particles. The resultant FPI /PTFE nanofiber membrane possessed desirable superhydrophobicity (water contact angle (WCA) of 155.3°), anti-wettability and durability due to the rough micro/nano structure of the membrane surface. The surface morphology and chemical composition of obtained FPI nanofiber membranes were characterized by SEM, FTIR, XRD and XPS, and the effects of PTFE content on the VMD performance were investigated. Results showed that the liquid entry pressure (LEP) of FPI/PTFE nanofiber membranes increased significantly after PTFE particles were introduced (LEP of 158 kPa). In the VMD process, the FPI/PTFE nanofiber membrane showed stable MD flux (33.49 L·m2·h−1) and excellent salt rejection (99.96%). Furthermore, the FPI/PTFE nanofiber membrane maintained its favorable performance, resulting in stable MD flux (30.21 L·m2·h−1) and salt rejection (99.96%) after the 120 h continuous long-term operation. It shows a promising future for VMD of FPI/PTFE nanofiber membranes.

Design of PTFE/PP multilayer composite membrane as mask filter layer with steady filtration efficiency and high dust holding capacity

Currently, commercially available mask filter materials, such as electrostatic electret polypropylene (PP) melt-blown cloth and polytetrafluoroethylene (PTFE) nanofiber membranes, always suffer a compromise between filtration efficiency and dust holding capacity, when used alone during air purification. In this study, a novel multilayer composite membrane was designed by thermally laminating a PP melt-blown filter layer (as the dust-holding layer) and a PTFE (Polytetrafluoroethylene) nanofiber layer (as the filtration layer), to improve filtration stability and capacity. The performance of the composite membrane was examined in relation to the effect of key laminating parameters (i.e., temperature, pressure and speed) on the dust holding capacity, filtration efficiency and resistance. NaCl aerosol was used as the model dust source. Results show that the composite membrane, prepared at a lamination temperature of 120 °C, a lamination pressure of 0.2 MPa and a lamination speed of 4 m/min, had a dust-holding capacity of 12.21 g/m2, which was over six times higher than that of the PTFE nanofiber membrane alone. During ten repeated cycles of NaCl aerosol filtration, water washing and alcohol disinfection, the composite membrane exhibited a steady filtration efficiency of above 99.9% over the NaCl aerosol. Meanwhile, the dust holding capacity was maintained above 8 g/m2 over the multiple cycles, while the resistance was smaller than 70 Pa.

Enhanced filtration characteristics of a PTFE foam-coated filter using PTFE nanofibers

Polytetrafluoroethylene (PTFE) is a bag filter material with limited options for fiber production methods because of its high melt viscosity. In this study, a new method for fabricating a PTFE composite filter with high filtration performance was proposed. PTFE nanofibers produced by electrospinning, were coated on the surface of the PTFE foam-coated filter, and heat-treated, resulting in the fabrication of PTFE composite filter. The optimal conditions for preparing PTFE nanofibers with a uniform fiber distribution were determined using a systematic approach. A uniform fiber morphology of the electrospun fibers was prepared by controlling the PTFE-Polyvinyl alcohol (PVA) mixing ratio and the electric field strength, and pure PTFE fibers were obtained by heat-treatment at an optimal temperature based on TGA, DSC, and FT-IR analyses. The filter quality factor of the resultant PTFE composite filter, which represents the filtration performance, was approximately twice that of the PTFE foam-coated filter for all particle sizes. Furthermore, the cleaning cycle and cleaning efficiency of the PTFE composite filter improved by 9% and 3.9–5.4%, respectively, compared to those of the PTFE foam-coated filter, which was closely related to high contact angles of water and oil.

Scalable Fabrication of Nacre-Structured Graphene/Polytetrafluoroethylene Films for Outstanding EMI Shielding Under Extreme Environment.

In this work, inspired by the great advantage of the unique "brick-mortar" layered structure as electromagnetic interference (EMI) shielding materials, a multifunctional flexible graphene nanosheets (GNS)/polytetrafluoroethylene (PTFE) composite film with excellent EMI shielding effects, impressive Joule heating performance, and light-to-heat conversion efficiency is fabricated based on the self-emulsifying process of PTFE. Both PTFE microspheres and nanofibers are employed together for the first time as "sand and cement" to build unique nacre-structured EMI shielding materials. Such configuration can obviously enhance the adhesion of composites and improve their mechanical property for the application under extreme environment. Moreover, the simple and effective repetitive roll pressing method can be used for the scalable production in industrialization. The GNS/PTFE composite film shows a high EMI shielding effectiveness (SE) of 50.85dB. Furthermore, it has a high thermal conductivity of 16.54W (m K)-1 , good flexibility, and recyclable properties. The excellent fire-resistant and hydrophobic properties of GNS/PTFE film also ensure its reliability and safety in practical application. In conclusion, the GNS/PTFE film demonstrates the potential for industrial manufacturing, and outstanding EMI shielding performance with high stability and durability, which has a broad application prospect for electronic devices in practical extreme outdoor environments.

Nanofibrous polytetrafluoroethylene/poly(ε-caprolactone) membrane with hierarchical structures for vascular patch.

With the prevalence of cardiovascular diseases, developing cardiovascular supplements is becoming increasingly urgent. The ability of cells to rapidly adhere and proliferate to achieve endothelialization is extremely important for vascular grafts. In this work, we electrospun polytetrafluoroethylene (PTFE) nanofibrous membranes and used induced crystallization to manufacture poly(ε-caprolactone) (PCL) shish-kebab microstructures on PTFE nanofibers to overcome the inertness of PTFE, and promote cell adhesion and proliferation. PCL lamella periodically grew on the surface of PTFE nanofibers yielding a hierarchical structure, which improved the biocompatibility and mechanical properties of the PTFE nanofibrous membrane. The deposition of PCL lamella improved the hydrophilicity of electrospun PTFE nanofibers membrane, leading to good cell proliferation and adhesion. Also, due to the surface inertness of the substrate material PTFE, this PTFE/PCL composite film has good anti-platelet adhesion properties. Furthermore, cell proliferation could be regulated by controlling the integrity of the PCL crystal network. The vascular patch showed similar mechanical properties to natural blood vessels, providing a new strategy for vascular tissue engineering.

The synergistic effect of polytetrafluoroethylene in-situ fibrillation and dibenzoyl sebacate hydrazide on the crystallization and foaming behavior of poly (lactic acid)

The fully degradable poly (lactic acid) foam with green environmental protection characteristics can alleviate the shortage of petroleum resources caused by the application of plastics. However, due to the inherent low melt strength and slow crystallization rate of linear PLA. It is difficult to obtain PLA microcellular foam with good morphology. In order to obtain PLA microcellular foam with ultra-high expansion ratio and small cell size, PTFE (polytetrafluoroethylene) nanofibers with excellent CO2 adsorption rate were introduced. Self-assembled nucleator TMC-300(dibenzoyl sebacate hydrazide) was also introduced to blend with PLA to obtain small-sized cells. The results show that the PTFE entanglement network as a self-assembled template can effectively improve the early crystallization nucleation efficiency and increase the crystallinity of branched PLA (CBPLA)/TMC by 7 %. The microcellular foam with PTFE content of 0.5 wt% (CBPLA/TMC/PTFE 0.5) was successfully prepared by physical foaming agent, which had the lowest cell size (8.7 μm) And high expansion ratio (1200 %).

Construction of Polytetrafluoroethylene nanofiber membrane via continuous electrospinning/electrospraying strategy for oil-water separation and demulsification

Oily wastewater treatment is an arduous and urgent global problem. Electrospinning has wide applications in construction of high-efficiency oil-water separation membranes. Herein, electrospinning and electrospraying technology were combined to construct a Polytetrafluoroethylene (PTFE) nanofiber membrane (NFM) with multileveled structure for oily wastewater treatment. The separation performance (driven by gravity) of the NFM to oil-water mixture was studied. In addition, the demulsification performance of the NFM to water-in-oil surfactant-stabilized emulsions (W/O SSEs) under gravity and oil-in-water surfactant-stabilized emulsions (O/W SSEs) at 0.5 bar were studied subsequently. The results showed that the flux of the 9% D-H-PTFE to the oil-water mixture reached 4909 L m−2 h−1, with a separation rate of 99.99%; the flux to the CCl4 W/O SSE reached 1867.93 L m−2 h−1 with the separation rate of 98.46%. The flux to the CCl4 O/W SSE was 122 L m−2 h−1 and the separation rate was 98.40% in multiple cycles. Therefore, these NFMs are expected to be practically applied to a low-pressure driven membrane separation system for preliminary separation of different types of oily wastewater.

Peculiar micro and nano cell morphology of PBT/PTFE nanofibrillated composite foams of supercritical CO2 foaming induced by in-situ formed 3D PTFE nanofiber networks

This study investigates the role of polytetrafluoroethylene (PTFE) nanofibers on the peculiar micro and nano foaming behavior of polybutylene terephthalate (PBT) before and after crystallization. In-situ PBT/PTFE nanofibrillated composites were prepared by melt compounding in torque rheometer. A physical network of high aspect ratio PTFE nanofiber is formed as the result of the fibers splitting and entanglement demonstrated by scanning electron microscope (SEM). In molten PBT, the formation of the nanofiber networks significantly increases the melt viscoelastic properties and promotes cell nucleation. As a result, high expansion ratio foams with average cell size of 13 μm were achieved in the melting PBT, which has some guiding significance for the formation of microcellular foam in extrusion foaming process. In addition, the crystallization process and crystallization morphology were investigated by differential scanning calorimeter (DSC), polarizing microscope (POM) and SEM. The crystallization kinetics of PBT were promoted due to the more crystallization nucleation interface provided by the high specific surface area of PTFE nanofibers. In the crystallization process of PBT/PTFE nanofibrillated composites, the PBT molecular chain first crystallized along the surface of PTFE nanofiber to form shish-kebab crystalline structure, and then the PBT molecular chain away from PTFE nanofibers crystallized. Consequently, the shish-kebab crystalline structure and the two-step crystallization induced formation of the peculiar oriented micro and nano cells. The research could present a facile and flexible method to regulate the cell morphology and expand the application of PBT foam.

Preparation and Characterization of PTFE/PI Nanofiber Composite Assembled Sponges

Due to the ultralow density and high specific area, nanofibrous sponges show great potential in the field of filtration and separation. To prepare nanofibrous sponges for high temperature smoke filtration, polytetrafluoroethylene (PTFE) was chosen due to its corrosion resistance and high temperature resistance. PTFE nanofiber prepared via electrospinning shows irregular concave-convex pores in the fiber body, which can improve the specific surface area and further enhance filtration performance. However, sponges made of PTFE nanofiber suffered from severe shrinkage, which limited the development in sponge products. In this study, polyimide (PI) nanofiber converted from polyamic acids (PAAs) nanofiber was introduced into the PTFE sponges to reinforce the dimensional stability. The parameters that influenced the morphology, porosity, shrinkage ratio, and thermodynamic properties of the composite sponges were also investigated. Moreover, the filtration performance of the composite sponges was tested. Results indicated that PTFE/PI composite nanofiber sponges possessed high porosity (94.34–98.12 %), excellent thermal stability (above 550 °C), and decent filtration efficiency (the maximum filtration efficiency reached 99.97 % to PM 2.0) were prepared, which demonstrated the potential in the field of high-temperature filtration.

Construction of Polytetrafluoroethylene Nanofiber Membrane Via Continuous Electrospinning/Electrospraying Strategy for Oil-Water Separation and Demulsification

Construction of Polytetrafluoroethylene Nanofiber Membrane Via Continuous Electrospinning/Electrospraying Strategy for Oil-Water Separation and Demulsification

Novel Composite Membranes Reinforced By Vertically Aligned Electrospun PTFE Nanofibers for Enhancing Proton Conduction and Dimensional Stability in PEM Fuel Cells

Polymer electrolyte membrane fuel cells (PEMFCs) have widely been considered environmental friendly alternative energy technologies due to their high energy conversion efficiency and zero emission. In the recent, the importance of performance and durability of electrolyte membrane, interfacial layer separating two electrodes, prohibiting fuel cross-over, while transporting only protons, has become much crucial for utilizing PEMFCs to the automobile applications such as fuel cell electric vehicles (FCEVs) and drones. Unfortunately, the current state membranes, mainly composed of perfluorosulfonic acid (PFSA) ionomers, have suffered from the high cost and low proton conductivity, and low dimensional stability during dynamic humidity changes during fuel cell operation. In order to deal with these issues, recently, a reinforced composite membranes (RCMs) have been developed in which a PFSA ionomer is impregnated into a porous support matrix consisted with nanofibrous polymer materials such as polytetrafluoroethylene (PTFE) due to their thermal/mechanical robustness. The PTFE based RCMs could provide enhanced mechanical stability and electrochemical performance with a reduced use of PFSA ionomer, but low impregnation of ionomers into nanosized hydrophobic PTFE networks, resulting in phase separation and irreversible creep deformation. Herein, we report a novel preparation of vertically alined PTFE aggregated fibers (PTFE AFs) as a reinforcement by using facile electrospinning hetero-polymer solutions containing PTFE nanoparticles and polyethylene oxide (PEO) as a carrier polymer and subsequent thermal removal of PEO. Developed PTFE AF were effectively soaked by PFSA ionomers, and PTFE AF based RCMs delivered outstanding dimensional stability and proton conductivity compared to commercial RCMs. Furthermore, PTFE AF based RCMs used MEA exhibited exceptional single-cell performance and long-term stability. The enhanced performance was attributed to the facile proton conduction through the one dimensional channels between aligned fibers without fiber scattering, and effective suppression of volume expansion of hydrated PFSA ionomer by rectangular shaped PTFE fiber network. We believe the widespread use of novel PTFE fiber based membranes with an unique pattern in a variety of membrane applications where porous supports are used. Figure 1

Non-isothermal crystallization kinetics of polypropylene/polytetrafluoroethylene fibrillated composites

Non-isothermal crystallization kinetics of polypropylene (PP)/polytetrafluoroethylene (PTFE) fibrillated composites is presented. In-situ fibrillated PP/PTFE-composites containing 1 and 3 wt% PTFE were prepared by melt compounding using a twin-screw extruder. The morphology and non-isothermal crystallization behavior of the composites were examined using scanning electron microscopy and differential scanning calorimetry, respectively. The Mo equation was used to analyze the kinetics of non-isothermal crystallization behavior. The PTFE created a three-dimensional (3-D) network. A low PTFE content promoted crystallization through fast nucleation, whereas a high PTFE content decreased the crystallization kinetics through hindering the crystal growth. These findings are all based on the Mo equation analysis. The activation energy and nucleation activity were also evaluated, and the way in which the PTFE nanofibers affected the crystallization was discussed in detail. Polarized optical microscopy images revealed that the size of PP spherulites decreased with the increase of PTFE content. Finally, the effect of PTFE on the crystalline phase of PP was investigated by wide angle X-ray diffraction.