Plastic Composites Research Articles

P-347 In search of the most efficient device to freeze low numbers of spermatozoa: a comparative evaluation of various vitrification device

Abstract Study question Can different vitrification devices be used for cryopreservation of few spermatozoa for patients with varying sperm concentrations and which device is the most efficient? Summary answer The study demonstrates the efficacy of Cryotop, CBS, and Vitrifit devices in cryopreservation of low numbers of spermatozoa, with Cryotop Open showing superior performance. What is known already Sperm cryopreservation is crucial for managing male-factor infertility, yet conventional methods, reporting significant reduction in motility with only 30 to 40% viability post-thawing, fall short of optimal cryopreservation of small numbers of spermatozoa. Currently, ongoing efforts to enhance cryopreservation techniques seek to minimize cryodamage and optimize outcomes, particularly for spermatozoa from patients with conditions like oligozoospermia, cryptozoospermia, or azoospermia, where each spermatozoa is of substantial importance. Several devices have shown promising results regarding cryopreservation of small numbers of spermatozoa. However, to date, no comparison has been performed between multiple embryo-vitrification devices in terms of recovery and viability post thawing. Study design, size, duration Between January 2023 and May 2023, this study included 50 fresh ejaculated routine samples: 25 with spermatozoa concentrations >1 million/ml and 25 samples with concentrations <1 million/ml. For each sample, 10 motile spermatozoa were loaded on four different embryo-vitrification devices performed in triplicate: Cryotop Open (Kitazato), Cryotop Closed (Kitazato), CBS (Cryo BioSystem) and Vitrifit (Cooper Surgical). Recovery, motility, immotile vitality rates, user-friendliness as well as the duration of the freezing/thawing procedures were examined. Participants/materials, setting, methods Ten spermatozoa, selected in Hepes-HSA, were loaded into a 2 µl mixture of SpermFreeze and HEPES-HSA. Held 3 cm above LN2 for 2 minutes, straws were plunged into LN2. Thawing involved immersing straws in 2 µl Hepes-HSA under oil. Hypo-Osmotic-Swelling test was used for the vitality assessment of the immotile spermatozoa. Thawing protocols showed minor variations based on the carrier type. The study was approved by the local Ethics Committee. Main results and the role of chance This study conducted a detailed analysis of four vitrification devices for cryopreservation of low spermatozoa numbers. For concentrations >1 million/ml, Vitrifit, Cryotop Open, Cryotop Closed, and CBS displayed comparable recovery rates (mean % ± SD) (85±0.09, 89±0.06, 84±0.10, 86±0.07); motility rates (76±0.12, 79±0.08, 78±0.13, 80±0.08); immotile vitality rates (16±0.08, 13±0.07, 13±0.09, 12±0.07). In this group, Vitrifit and Cryotop Open exhibited similar freezing and recovery times (4’10’’/7’42’’ and 4’11’’/7’40’’ respectively). Cryotop Closed and CBS had slightly longer freezing times (4’33’’ and 5’31’’ respectively), with Cryotop Closed showing the fastest recovery (7’11’’). Similarly, for sperm concentrations <1 million/ml, devices demonstrated similar recovery (87±0.09, 91±0.06, 88±0.07, 83±0.12), motility (55±0.10, 61±0.09, 56±0.07, 50±0.09), and immotile vitality (26±0.07, 26±0.06, 27±0.07, 27±0.06). For concentrations <1 million/ml, all devices showed similar freezing and recovery times. Statistical analyses, including ANOVA and Levene’s test, revealed no significant inter-device differences, substantiated by minimal Cohen’s d effect sizes. Regarding the practical aspect, due to the ergonomic design and plastic composition that allows better microscopic visibility, Cryotop (both closed and open) demonstrated superior handling performance to CBS. Considering both statistical validation and manipulation, Cryotop Open distinguishes itself as the most efficient and user-friendly device for cryopreservation of low spermatozoa numbers. Limitations, reasons for caution The study’s main limitation is the limited sample size. Further research with larger cohorts and exploration of fertilization potential is necessary to validate these findings. Additionally, our study did not explore potential variations in cryopreservation outcomes related to additional sperm sample characteristics, which could impact the results. Wider implications of the findings Successful cryopreservation of low sperm numbers provides hope for cryptozoospermia and (non-)obstructive azoospermia patients. It allows the use of their own sperm, potentially avoiding donation. With superior frozen sperm survival, recovery rates, and a shorter search time, this method enhances fertility preservation accessibility, guiding patients in future IVF treatments effectively. Trial registration number EC-2022-272

Easy and Green Method to Fabricate Highly Thermally Conductive Poly(decamethylene terephthalamide)/Graphite Nanoplatelets Nanocomposite with Aligned Structure.

With the development of miniaturization and integration of electrical and electronic equipment, the heat accumulation problems caused by the long-term operation of devices have become more and more serious. High thermal-conductivity and high-performance plastic composites have attracted significant interest from both academia and industry. Numerous studies have been recently conducted to enhance the thermal conductivity (TC) of nanofiller-filled polymeric composites. However, the homogeneous dispersion and directional arrangement of nanofillers in the resin matrix are the key factors limiting their effectiveness in enhancing thermal conductivity. Based on the feasibility considerations of mass production and industrial application, this paper reports on a novel preparation method of Poly(decamethylene terephthalamide)/graphite nanoparticle (GNP) nanocomposites with high thermal conductivity. Without borrowing solvents or other reagents, this method can effectively strip the inexpensive scaled graphite into nanoscale for its uniform dispersion and orientation arrangement by relying only on mechanical external forces. The whole technology is simple, green, and easy to industrialize. The fillers were well-dispersed and aligned in the PA10T, which played a role in significantly enhancing the thermal conductivity of the PA10T. In addition, we found that the thermal conductivity of the composites reached 1.20 W/(m·K) at 10 wt% filler content, which was 330% higher than that of the pure matrix. The mechanical properties of the composites were also significantly improved. This work provides guidance for the easy fabrication of thermally conductive composites with aligned structures.

Sustainable basalt fiber reinforced polyamide 6,6 composites: Effects of fiber length and fiber content on mechanical performance

The aim of this study is to explore the use of sustainable basalt fiber (BF) as compared to glass fiber and talc in injection molded engineering polyamide 6,6 (PA 6,6) plastic composite. Basalt fibers having lengths of 3 mm and 12 mm were added to PA 6,6 at 23 and 30 wt.% to fabricate the composites. The addition of basalt fiber restricts the mobility of the polymer chain in the composites, leading to its increased viscosity. Rheological results showed that the out-of-phase response to the applied stress indicated that the 3 mm basalt fiber composite could dissipate more energy, and the elastic behaviour of the composite under deformation increased with increasing basalt fiber wt.%. The fiber length had a larger effect on the mechanical properties of the composites as compared to the fiber load. The 12 mm basalt fiber composites at 23 wt.% and 30 wt.% produced higher tensile strength and modulus than the 3 mm basalt fiber composites while the 3 mm basalt fiber composite at 30 wt.% resulted in a 25 % increase in flexural strength. The experimental and the theoretical modulus predicted by the rule of mixtures showed an interaction between the matrix and the basalt fiber. Morphological analysis shows more agglomeration in composites with 3 mm fiber than the 12 mm. Glass fiber-reinforced PA 6,6 showed slightly higher performance than basalt fiber-reinforced PA 6,6. However, the basalt fiber-reinforced composites demonstrated better performance in tensile strength, flexural modulus, flexural strength, and heat deflection temperature than talc-reinforced composites.

Formation of dual quasi-continuous networked structure and its strengthening effect in Ti-6Al-4V alloy reinforced with graphene via powder bed fusion

A dual-networked distribution of the reinforcements holds promise for achieving a balance between high-strength and moderate plasticity in titanium matrix composites (TMCs). Unfortunately, achieving this improvement in TMCs via additive manufacturing (AM) methods, presents significant challenges. Those challenges arise from the inherent differences in chemical and physical properties, which often led to agglomeration of the reinforcement and cracks caused by the high thermal residual stresses. To overcome those issues, this study focuses on the development of Ti-6Al-4V (Ti64) alloys incorporated with 0.5 wt% graphene nanosheets (GNSs) constructing a dual quasi-continued TiC network structure via powder bed fusion. The results exhibited a super-high tensile yield strength (1307 MPa), accompanied by a moderated elongation of 2.6% with reduced residual stress. The microstructure, phase contents, and mechanical performance were thoroughly investigated. A thermo-metallurgical-mechanical coupling model was developed, considering factors such as laser absorption effects and laser scanning strategy. Finally, a reasonable dual-network model was built to elucidate the contribution of various strengthening factors. Overall, this study illustrates that the strength of GNS/Ti64 composites is affected by the factors of GNS distribution, quasi-continue network in-situ TiC particles, temperature and residual stress field, offering a reference for fabricating high-strength nanocarbon/Ti64 composites by AM methods.

Empowering Precision Oncology: Advancing Cancer Research by Augmenting Single-cell RNA and Bulk RNA Sequencing for Confronting the Heterogeneity in Ovarian Cancer

ABSTRACT Ovarian cancer presents significant challenges in clinical oncology due to its high prevalence, heterogeneity, and late-stage diagnosis. Our study explores the application of single-cell RNA sequencing (scRNA-Seq) and bulk RNA sequencing to enhance our understanding of ovarian cancer at the molecular level. We highlight the diagnostic strategies and emphasize the critical role of scRNA-Seq in unraveling the intricate cellular composition and phenotypic plasticity within ovarian tumors. We also discuss the identification of rare cell subtypes, characterization of distinct cell types, and elucidation of molecular features, signaling pathways, and dysregulated networks using scRNA-Seq. Furthermore, our study showcases how scRNA-Seq aids in the discovery of novel biomarkers for diagnosis, prognosis, and treatment response prediction, as well as identifying therapeutic targets and pathways associated with drug resistance.

Resistance of Wood Plastic Composites Having Silica Filler to Subterranean Termite

Resistance of Wood Plastic Composites Having Silica Filler to Subterranean Termite

Preliminary Investigations on the Performance and Characterization of Municipal Wastewater Sludge-Derived Biochar–Plastic Composites: A Resource-Oriented Solution to Sludge and Plastic Waste

Preliminary Investigations on the Performance and Characterization of Municipal Wastewater Sludge-Derived Biochar–Plastic Composites: A Resource-Oriented Solution to Sludge and Plastic Waste

Waste Study on Flexible Food and Non-Food Packaging: Detailed Analysis of the Plastic Composition of European Polyethylene-Containing Waste Streams.

Despite extensive sorting, packaging waste often contains a mixture of different materials that make high-quality recycling difficult, especially in the case of flexible packaging. This is partly due to the widespread use of multi-layer laminates and packaging consisting of different inseparably combined materials. To improve the post-consumer recyclate quality and develop optimised recycling processes, it is important to generate a comprehensive understanding of the composition of the sorted packaging waste streams. Therefore, in this study, polyolefin sorting fractions for flexible packaging waste from three European countries are analysed in detail. By selective extraction of the different plastics, their mass fractions in the waste streams are determined. This shows that the PE-rich sorting fractions for flexible packaging are made up of 85-90% of PE, but also contain a certain proportion of foreign materials. A detailed analysis of the layer structures of various types of packaging also provides information on the prevalence of multi-layer packaging and the polymer and non-polymer materials used therein. This shows that particularly in food packaging, with 63-84% of multi-layer and 50-70% of multi-material packaging, a high proportion of foreign materials is used and introduced into the sorting fractions. These insights provide a valuable contribution to the development of recyclable packaging, potential sorting streams and recycling processes, especially with regard to the challenges of the closed-loop recycling of food packaging.

Effect of TiC particle size on the microstructure and properties of CuCr-TiC composites manufactured by powder metallurgy

Poor thermal stability limits the application of CuCr alloys at high temperatures. In this work, non-stoichiometric TiC particles (7 vol%) reinforced CuCr matrix composites were fabricated. The effects of TiC powders with different particle size (1 μm, 2 μm, 4 μm) on the microstructure and properties were studied. The diffusion of supersaturated Ti atoms induced the formation of Cu (Ti) solid solution transition layer at the interface, which improved the interface bonding. Dislocations caused by thermal mismatch promoted heterogeneous nucleation, which led to the precipitation of coarse Cr clusters. The strength and plasticity of composites increased with the reduction of TiC particle size. Strengthening and fracture mechanisms were discussed, and the strength difference was mainly attributed to thermal mismatch strengthening. Meanwhile, TiC particles refined the matrix grains and improved the activation energy of grain growth. The strength and softening temperature of CuCr alloy were 520 MPa and 540 °C, while that of CuCr-1TiC composite were 530 MPa and 915 °C. CuCr-TiC composites displayed much superior thermal stability than the CuCr alloy. These findings provide practical approaches for developing particle-reinforced copper matrix composites with excellent interfacial bonding and thermal stability.

Phase Separation‐Induced Electrical Conductivity for Liquid Metal‐Embedded Plastic Hybrid Composites with Metallic Conductivity and Recyclability

AbstractConductive fillers‐embedded plastic polymer hybrid composites are crucial electronic materials in modern technologies owing to their tunable conductive properties, low density, and corrosion resistance. However, the application of traditional rigid inorganic conductive fillers‐embedded plastic composites is constrained by their subpar electrical conductivity and mechanical properties. Consequently, liquid metals (LMs) including gallium and gallium‐based alloys, have recently emerged as the preferred conductive flexible fillers over traditional rigid fillers. This work employs a solvent evaporation method and phase separation‐induced conductivity mechanism. The resulting flexible and electrically conductive LM‐polycarbonate (PC) film circuits demonstrate ultrahigh metallic conductivity, robust mechanical performance, excellent solvent recyclability, and notable processability. The fluidic nature of LMs and the superior mechanical properties of the PC polymer confer high electrical stability and durability to the LM‐PC film circuits under diverse mechanical forces and environmental conditions. The LM‐PC film circuits are exceedingly promising and apt for use as flexible conductors in contemporary electrical applications, including electricity transmission and underwater working.

Preparation and properties of bamboo fiber/polylactic acid composite modified with polycarbodiimide

Bamboo fiber (BF) is favored by people for its renewability, low cost, fast growth, low density, high hardness, pollution-free, and easy harvesting. However, when preparing composites by blending and extruding BF and degradable plastic PLA, the significant difference in polarity between the two leads to a significant decrease in mechanical properties, which limits the application of BF in bamboo plastic composites. In order to improve the compatibility between PLA and BF, this study used polymerized carbodiimide (PCD) as a compatibilizer to prepare modified BF/PLA composites and investigate the effect of BF content on the composites. The results showed that the addition of PCD increased the flexural strength, flexural modulus, impact strength, tensile modulus and tensile strength of PCD-BF/PLA compared to BF/PLA composites, with the impact strength increasing the most significantly by 20.91 %. Meanwhile, the tensile strength improved by 15.06 % from 55.1 MPa to 63.4 MPa, and the flexural strength improved by 14.82 % from 80.3 MPa to 92.2 MPa. The experimental investigation of BF content revealed that when the ratio of BF to PLA was 4:6, the impact and flexural strength of the BF composites did not significantly decrease, but the flexural modulus and tensile strength increased, with the flexural modulus increasing the most significantly by 90.53 % compared to PLA, while the cost has been reduced by 13.80 %. The porosity experiment also showed that as the BF content increased, when the ratio of BF to PLA was 4:6, the porosity of the composite material was only 3.98 %, which was not further significantly increased compared to 3.62 %. The prepared high proportion biomass can be used in tableware, and other fields.

Effect of synergistic microalloying on the microstructural optimization of Mo/NiAl alloy with excellent mechanical properties under rapid non-equilibrium solidification

Low room-temperature plasticity and poor high-temperature strength extremely restrain the extensive application of NiAl composites. Herein, our work synergistically optimized the NiAl microstructure via alloying of Mo to relieve imbalance of strength and ductility under rapid non-equilibrium solidification supplemented with the first principle calculation. Remarkably, the addition of Mo significantly refined the microstructure of NiAl–15Mo. Moreover, enhanced by the uniform precipitation Mo phase, the coordinately deformed Mo phase at the grain boundary and the partial Mo solid solution occupied Ni sites, the NiAl–15Mo showed superior strength-ductility. The mechanical properties (σ0.2, σUCS, UT) of NiAl–15Mo composites at room temperature were 944 MPa, 1841 MPa, and 27,068 MPa·%, which were increased by ∼55.3 %, ∼48.7 % and ∼41.0 % compared with the conventional NiAl composites, respectively. In particular, owing to solid-solution Mo atoms restrict the climb of dislocations and the stronger covalent bond orbital hybridization between Ni-3d and Mo-4d, the mechanical properties (σ0.2, σUCS, UT) of NiAl–15Mo at 1000 °C are 212 MPa, 265 MPa and 7922 MPa·%, which has an increase of ∼175.3 %, ∼120.8 % and ∼228.0 %, respectively. This work provides a new perspective to manipulate and coordinate Mo multiple reinforcing ways and achieve the high strength and plasticity of NiAl composites.

Silica nanoparticle-reinforced polyurethane plastic immobilized with strontium aluminate nanofiller: Ultraviolet protection, superhydrophobicity and photoluminescence

A simple strategy was reported toward a possible industrial preparation of smart plastic materials with persistent afterglow, ultraviolet protection, superhydrophobic properties and photochromism. Nanoparticles of rare-earth doped aluminate (NREA) were embedded into a polyurethane plastic composite. A combination of polyurethane (bulk material), silica nanoparticles (nanofiller), and NREA (luminous agent) was prepared. Achieving a uniform distribution of NREA in a polyurethane fluid allows for the manufactured plastic to be colorless. NREA showed diameters between 12 nm and 26 nm. When excited at 365 nm, the produced photoluminescent polyurethane composite demonstrated an emission band at 519 nm. NREA contents more than 1 % were found to exhibit persistent photoluminescence, whereas pigment concentrations less than 1 % were found to exhibit fluorescence emission. The created plastic concrete exhibited photochromism, as shown by the coloration parameters and photoluminescence spectra, which proved a change in color between transparent during daylight, green under ultraviolet rays, and greenish-yellow in darkness. The static contact angle tests demonstrated effective superhydrophobic properties. Significant improvements were detected ultraviolet protection and photostability. The hardness properties, structural compositions, and morphology of the developed polyurethane plastics were also explored.

Modelling of size-dependent plasticity in polymer-based composites based on nano- and macroscale experimental results

A number of experimental evidences indicate that the local response of polymer matrices near fibres is inadequately represented by classical continuum models relying on the bulk polymer behaviour. This results from size-dependency associated to large plastic strain gradients, complex interphase behaviour and/or changes of polymer structure. Classical multiscale models require artificial tuning of the properties to provide realistic macroscale predictions. We demonstrate that an unprecedented modelling approach based on a micromorphic theory is able to capture such size effects in long-fibre composites. The model is identified via nano digital image correlation strain fields and validated by predicting the strengthening found in transverse compression of UD composites, not captured by classical models. Micro-shear bands are properly regularised by the model, thus correctly handling the size-dependent plasticity and softening effects. The improved prediction of the strain localisation pattern in the matrix opens avenues to more accurately model interfacial failure and damage processes.

Numerical simulation of mechanical properties of composite high-pressure vessel for space application

Abstract A composite high-pressure vessel reinforced with T1000 carbon fiber and featuring an ultra-thin titanium lining for space applications is examined. Using the laminated plate theory for composite materials and the elastic-plastic theory for isotropic materials, a three-dimensional finite element model is developed. The pressure test results confirm the correctness of the finite element model. Under various internal pressure circumstances, the displacement and strain distribution of the metal liner and the laminated composite are compared and analyzed. It is shown that the composite vessel primarily deforms along the axial direction when the internal pressure is greater than the working pressure of the vessel. Only elastic deformation is present in the composite layer, but both plastic and elastic deformation are present in the ultra-thin titanium liner.

Study on flexural property of glass fiber-reinforced polymer reinforced wood–plastic composite panels

ABSTRACT Fiber-reinforced polymers (FRPs) and wood–plastic composites (WPCs) have broad application prospects with the advantages of recyclability, lightweight, and corrosion resistance. However, WPCs cannot be used for bearing structures because of their poor mechanical properties. In order to improve the mechanical properties of WPCs, this study proposed a glass fiber-reinforced polymer (GFRP) to reinforce the tensile zone of WPCs. The failure mode, ultimate bearing capacity, and deformation of the panels were studied by four-point bending tests and finite-element simulations. The results showed that the failure modes of the panels were a mainly flexural failure, flexural shear failure, and interface debonding, and the optimal thickness of GFRP improved the ultimate bearing capacity of the WPC panel by 205% and the deflection by 55%. Finite-element simulations of WPC reinforced with GFRP were carried out, and the densities of WPC and the angles of glass fiber layup were considered. The results showed that the higher the density of WPC, the better the strengthening effect of the structure, and the fiber layup angles had less effect.

Evaluation of Cutting Parameters on Heat-Affected Zone in Wood Plastic Composites by Pulsed Fiber Laser

Biodegradable and environmentally friendly composite materials such as wood plastic composites (WPCs) have gained attention in industrial applications due to environmental concerns and global sustainability goals. However, owing to their unique structures and properties, cutting on WPCs can be challenging. Continuous wave (CW) mode laser may result in heat build-up and easily warp the WPCs during laser cutting. Therefore, minimizing these defects and determining the cutting parameters that influence the heat-affected zone (HAZ) by pulsed mode laser is essential. In this present work, 1 mm thickness of WPC 30 wt.% of wood fiber (WF) filled with recycled high-density polyethylene (rHDPE) has been experimentally cut by single-mode pulsed fiber laser to evaluate the minimum laser energy required to cut the WPC and the influence of cutting parameters on the HAZ. The HAZ was measured using a digital microscope, and the statistical significance of the cutting parameters to HAZ was determined by analysis of variance (ANOVA). The results confirmed that a minimum linear energy of more than 9 J/mm is required to cut the WPC. It has been found that the cutting speed is the major influence on the HAZ, followed by pulse width. Adequate interaction time by cutting speed and duration of the single-laser pulse also significantly affects the cutting process. The higher gas pressure could minimize the HAZ at the surrounding cutting region of the WPCs. Understanding the influence of these parameters could minimize the thermal effect of HAZ and improve the laser cut quality.

Combustion characteristics of refuse-derived fuel pellets having varying plastic compositions.

The plastic fraction of refuse-derived fuel (RDF) pellets influences fuel's physico-chemical, and mechanical properties, which in turn might affect the combustion behavior of RDF. In the present study, the combustion behavior of different plastic fraction-simulated RDF pellets is reported. The simulated pellets were prepared based on the Indian commercial RDF composition. Initially, the plastic content varied from the existing fraction in Indian commercial RDF, i.e., 35% (RDF-1), to a lower plastic content of 5% (RDF-2). Physico-chemical characterization showed that a higher plastic fraction in RDF-1 reduces its pellet density by 25% as compared to RDF-2. The changes in RDF physico-chemical properties due to plastic variation are reflected in the RDF conversion process. Single-particle and packed-bed studies concluded that the lower density for higher plastic RDF-1 leads to lower conversion times (36%), and higher flame front speed (11%), which are desirable conditions for faster conversion. However, packed-bed studies also showed limitations regarding the utilization of high plastic RDF as RDF-1 has a narrow range of operating air mass flux due to the early advent of convective cooling of the bed. Finally, considering the constraints associated with the utilization of high plastic fraction (~ 35%) RDF and to maximize the effective utilization of plastic in RDF, a workable plastic fraction of 15% in RDF was proposed and tested for its combustion properties. RDF with 15% plastic showed faster conversion, higher flame front speed, and a wider range of operating air mass flux before the advent of convective cooling of the bed.

Thermal-oxidative stability of PVC compositions modified with a bromine-containing plasticizer-flame retardant

The possibility of creating polymer compositions based on polyvinyl chloride plasticized with a bromine-containing flameretarding plasticizer has been investigated. Their thermostability at introduction of plasticizer with different bromine content was evaluated. The optimal concentrations of bromine in the flame-retarding plasticizer to increase the thermal stability of the polymer composition have been established. It is noted that increasing the concentration of bromine in the flame-retarding plasticizer increases the rate of elimination of hydrogen bromide and slows down the thermal destruction of the polymer matrix. It is shown that during thermo-oxidative degradation of plasticized PVC composite, hydrogen bromide is first eliminated from flame-retarding plasticizer, which accelerates the process of polyene formation and additional cross-linking of polymer macromolecules. An increase in the tensile strength of plasticized compositions at the introduction of optimal dosages of flame-retarding plasticizer was observed.

Chip morphology’s effect on properties of PLA-based bamboo–plastic composites produced using hot-pressing

This study explored the effect of raw material morphology on the properties of bamboo–plastic composites produced using hot-pressing. To provide a reference for reducing the production cost and improve the product properties of the composites, polylactic acid (PLA)-based bamboo–plastic composites were prepared using bamboo chips with a shaved morphology (BS) and fiber morphology (BF) and PLA as the matrix material, via hot-pressing. The properties of the bamboo–plastic composites formed with BS and BF chips were studied and compared with those of composites with conventional granular morphology (BM) and powder morphology (BP). The results showed that when the content of the bamboo chips was at 50% (the same below), the mechanical properties of the BF/PLA composites were remarkably better than those of the other PLA-based composites. However, the BF/PLA composites showed a high degree of hydrophilicity, with a water contact angle of 70.0° and a water absorption of 10.8% at 288 h. More holes could be seen in the BF/PLA composites using a scanning electron microscope. Among the four types of PLA-based composites, better melt fluidity was found only in the BF/PLA composites, and the melting index was 65.3 g/min.