Crystallization Enthalpy Research Articles

Modification of Poplar Wood via Polyethylene Glycol Impregnation Coupled with Compression

Wood permeability and compressibility are affected by cell wall structure and chemical composition. These properties can be improved by appropriate wood pretreatments. Low-density poplar wood was converted to a more dense structure by the following steps: First, lignin and hemicellulose were removed using a mixture of NaOH and Na2SO3. Second they were impregnated with polyethylene glycol (PEG, mean molecular weight of 1200), nano-SiO2, and a silane coupling agent at atmospheric temperature and pressure. Finally, impregnated wood was compressed at 150 °C. Results showed that the tracheid lumens on the transverse section of the compressed wood almost vanished. Specifically, the lumens in the wood cells, especially those that were compressed, were almost completely filled with PEG. In FTIR, the asymmetric absorption peaks of Si–O–Si at 1078–1076 cm−1 were clearly observed, which confirms the existence of bonding between nano-SiO2 and wood. The highest melting enthalpy and crystallization enthalpy showed a heat storage capacity of modified wood, which were 20.7 and 9.8 J/g, respectively. Such phase change capabilities may have potential applications in regulating the rate of change of room temperature. In summary, the modified wood could be utilized as material for construction to conserve energy.

Physical properties of oleogels fabricated by the combination of diacylglycerols and monoacylglycerols

AbstractOleogelation is an efficient way to offer healthy substitutes for trans and saturated fatty acids in processed foods. Multicomponent gels are of particular interest due to the ability to tune gel properties by altering the component proportions. In this study, monoacylglycerol (MAG) and diacylglycerol (DAG) are used as gelator blends and the influence of the gelator ratio on the characteristics of oleogels was investigated. The crystallization and melting behavior, solid fat content (SFC), crystal morphology, polymorphism and mechanical properties of the oleogels were characterized. The oleogels with higher gelator level displayed increased oil binding ability and shorter crystal formation time. The oleogels with higher MAG ratio exhibited more fibrillar‐like crystals, and the mixed oleogels with MAG:DAG of 5:5 showed altered crystal morphology with finer crystal size, reduced crystallization enthalpies and solid state possibly due to the increased nucleation seeds promoted by MAG. The oleogels with high MAG level showed lower equilibrium SFC during isothermal crystallization but faster crystallization rate, higher hardness and elasticity. Therefore, by changing the ratio of DAG to MAG, the crystallization profile and rheological properties of oleogels can be tailored. The oleogels can be used as traditional solid fat substitutes to reduce saturated fatty acid content in lipid‐based products.

Molecular Structural Insight into the Cold Crystallization Process of Ionic Liquid Crystals

We have demonstrated a modified crystallization process of an ionic liquid crystal, 1-{[4′-(4″-nitrophenylazo)phenyloxy]}hexyl-3-methyl-1H-imidazol-3-ium tetrafluoroborate, by the addition of carbon nanotubes (CNTs), successfully suppressing the supercooled state, and hence the cold crystallization during reheating, to the complete conversion of melt crystallization upon cooling. The enthalpies of fusion of the crystals produced were similar among the samples (29.3–32.2 kJ mol–1); however, a crystallization-promoting pathway that increases the crystallization enthalpy by 20% was present. Through comprehensive thermal analysis, structural analysis, and infrared spectroscopy combined with quantum chemical calculations, we propose that this effect is caused by an increased crystal nucleation rate due to the π–π interactions between the molecule and the rigid CNT surface. These results not only give insights into the crystallization processes of ionic liquids in general but also provide guidelines to expand the range of applications of cold-crystallizing ionic crystalline materials for thermal energy storage applications.

Non-isothermal crystallization and thermo-mechanical properties of poly(butylene adipate-co-ethylene terephthalate) random copolyesters

Random aliphatic-aromatic copolyesters are synthesized through melt polycondensation of bis(2-hydroxybutyl) adipate (BHBA) with 0–15 mol% of bis(2-hydroxyethyl) terephthalate (BHET) oligomers. Regarding the random ester-interchange reactions, the sequence length distribution of butylene adipate (BA) units reduces with increasing BHET. Crystallization of copolyesters is investigated by differential scanning calorimetry. Crystallization peak temperatures (Tc) and melting peaks (Tm1, Tm2, and Tm3) of all samples decrease with increasing cooling rate. Moreover, increasing BHET results in the reduction of crystallinity. Regarding the results of Avrami, Tobin, Ozawa, and Mo's models for non-isothermal crystallization, the crystallization rate decreases as the BHET content increases. Using the isoconversional method of Friedman, it is revealed that copolymerization leads to a reduction of the absolute enthalpy of crystallization. According to the wide-angle X-ray diffraction (WAXD) results, the crystalline dimensions reduce with copolymerization, and flawed crystals are developed in copolyesters.

Preparation of perlite based‑zinc nitrate hexahydrate composite for electric radiant floor heating in model building and numerical analysis

Zinc nitrate hexahydrate, an inorganic phase change material, can store high latent heat during its phase change, but it has significant phase transition defects, including form instability, a high degree of supercooling, and phase separation issues. Zinc nitrate hexahydrate/expanded perlite (EP) composite was fabricated by impregnating zinc nitrate hexahydrate into expanded perlite and further 65 wt% PCM-EP composite was coated with paraffin to reduce phase transition imperfections. Scanning electron microscope (SEM) results confirmed that the zinc nitrate hexahydrate could be impregnated into expanded perlite, and paraffin successfully formed a coating layer on the expanded perlite surface. Fourier transform infrared spectroscopy (ATR-IR) confirmed no chemical interactions between zinc nitrate hexahydrate and expanded perlite. The melting and crystallization enthalpies of paraffin-coated PCM composites are 82.24 ± 2.93 kJ kg−1 and 73.32 ± 1.97 kJ kg−1 respectively. The supercooling was reduced from 7 °C to 1 °C owing to numerous nucleation sites on the surface of expanded perlite and coating effect of the paraffin. After the 500 thermal cycles, melting and crystallization enthalpy of coated composite PCM is 78.24 kJ kg−1 and 68.32 kJ kg−1 respectively. Electric radiant floor heating application studies of the coated composite phase change material were performed by varying heat transfer area of building model and amount of composite used. COMSOL Multiphysics 5.6 was used to simulate the thermal buffering performance of the composite in floor heating application. The temperature profile predicted by the simulation was found to be quite close to the experimental data.

Preparation and Analysis of Sheath-Core Intelligent Thermo-Regulating Fiber.

In this work, a skin–core composite intelligent temperature-adjusting fiber was prepared using the composite melt spinning method, with polypropylene as the skin layer and T28-type paraffin as the core layer, in order to obtain clothing fibers with a bidirectional temperature adjustment function. A differential scanning calorimeter was used to test the phase-change latent heat of fibers with different amounts of paraffin injections, and an infrared thermal imager was used to monitor the skin–core composite intelligent temperature-adjusting fiber bundles and ordinary polypropylene fiber bundles under the same heating and cooling conditions. The temperature of the fiber bundle was considered to be a function of time. The results showed that with the increase in the amount of the paraffin injections, the proportion of the paraffin component in the fiber and the latent heat of the fiber phase transition also increased. When the paraffin injection amount was 1.5 mL/min, the melting enthalpy and the crystallization enthalpy reached 65.93 J/g and 66.15 J/g, respectively. Under the same conditions, the heating speed of the intelligent temperature-adjusting fiber bundle was found to be slower than that of the ordinary polypropylene fibers, and the maximum temperature difference between the two reached 8.0 °C. Further, the cooling speed of the former was also observed to be slower than that of the latter, and the maximum temperature difference between the two reached 6.7 °C.

Multilayer Nonwoven Inserts with Aerogel/PCMs for the Improvement of Thermophysiological Comfort in Protective Clothing against the Cold

This study aimed to assess the developed nonwoven inserts with aerogel/PCM (phase change material) microcapsules for use in protective clothing against cold in terms of properties related to thermophysiological comfort. These inserts were obtained by the thermal bonding of a multilayer system consisting of needled-punched nonwovens and silica aerogel particles and/or PCM microcapsules evenly distributed between them. The influence of aerogel and PCM microcapsules on the basic physical properties of inserts, their microstructure, air permeability, and water vapor resistance was investigated and analyzed. The thermal insulation properties of inserts were assessed based on thermal conductivity results. The inserts with PCMs were also tested for their ability to regulate the temperature in the undergarment microclimate using the differential scanning calorimeter (DSC) and the “skin model” device. The research showed that the use of aerogel allowed for reducing the thermal conductivity of the insert by approximately 13% compared to the insert without additives. The high values obtained of the melting and crystallization enthalpy of inserts with PCMs confirmed their high efficiency in the heat absorption and release. Thus, the use of aerogel and PCMs in protective clothing against cold seems to be an effective solution for improving its protective properties and actively adapting its thermal insulation to the changing temperature conditions and the activity level of employees.

Form-stable phase change materials based on hierarchically channel-like silica nanofibrous mats for thermal energy storage

Hierarchical channel-like SiO2 nanofibrous mats were prepared via microemulsion electrospinning in combination with calcination for thermal energy storage. The interior channel number of SiO2 nanofibers was flexibly regulated by tuning the proportion of continuous phase to dispersion phase. Microemulsion electrospinning, as a method of single-spinneret electrospinning, makes it versatile, simple and convenient for the preparation of hierarchical SiO2 nanofibers with multi-channel structure and high porosity. Quinary fatty acid eutectics were encapsulated in multi-channel SiO2 mats to obtain form-stable phase change materials (FSPCMs). The results indicated the crystallization enthalpy and melting enthalpy of as-fabricated FSPCMs could be up to 115.7 and 112.9 J·g−1, respectively. After 40 thermal cycles, there is no significant difference for the phase change temperature and enthalpy of FSPCMs, revealing outstanding thermal cycling stability. The study proves that microemulsion electrospinning is exactly a straightforward and universal method to fabricate the supporting substance of FSPCMs.

Shape-Stabilized Phase Change Materials with Superior Thermal Conductivity for Thermal Energy Harvesting

This work presents the preparation of highly thermally conductive and shape-stabilized phase change composites (SSPCMs) at low filler loading. Polyethylene glycol (PEG) served as the phase change component. The high thermal conductivity is realized by the construction of dual thermally conductive networks based on boron nitride (BN) and expanded graphite (EG). The shape stabilization is obtained by the combined effects of the physical absorption of EG and the chemical crosslinking of epoxy. The prepared composite has a thermal conductivity of 3.907 W m–1 K–1 at a low filler loading when filled with 6.00% EG and 16.00% BN. Correspondingly, the melting enthalpy and crystallization enthalpy can maintain 79.93 and 75.39 J g–1, respectively. The result indicates that the prepared composite has excellent thermal stability and PEG is firmly stabilized in the composites, it would not leak from the matrix when exposed to high temperature and long heating periods. The experiment also confirms that the prepared composite has superior solar-thermal energy conversion and thermal management ability.

Multiple Melting Temperatures in Glass-Forming Melts

All materials are vitrified by fast quenching even monoatomic substances. Second melting temperatures accompanied by weak exothermic or endothermic heat are often observed at Tn+ after remelting them above the equilibrium thermodynamic melting transition at Tm. These temperatures, Tn+, are due to the breaking of bonds (configurons formation) or antibonds depending on the thermal history, which is explained by using a nonclassical nucleation equation. Their multiple existence in monoatomic elements is now demonstrated by molecular dynamics simulations and still predicted. Proposed equations show that crystallization enthalpy is reduced at the temperature Tx due to new vitrification of noncrystallized parts and their melting at Tn+. These glassy parts, being equal above Tx to singular values or to their sum, are melted at various temperatures Tn+ and attain 100% in Cu46Zr46Al8 and 86.7% in bismuth. These first order transitions at Tn+ are either reversible or irreversible, depending on the formation of super atoms, either solid or liquid.

Thermodynamic study on the prevention of B30 biodiesel wax crystallization by γ-Al2O3 nanoparticles and sorbitan monooleate

This paper reports a thermodynamic investigation on the role of γ-Al2O3 nanoparticles and sorbitan monooleate (SMO) as cold-flow improver additives for B30 biodiesel blend. Here, the two additives were able to improve fuel’s cold-flow properties and responsible for reducing wax crystallization temperature as low as 6.42 °C. Based on DCS analysis, the addition of individual SMO or γ-Al2O3 nanoparticles gave rise to the increase in crystallization enthalpy and entropy. However, the opposite effect was observed when they were used in combination. This synergistic effect was found to be responsible for making them effective in the prohibiting the spontaneity of wax crystallization, which was proven by the increase in crystallization Gibbs free energy (ΔGxtal) value from −72.9 to −35.7 J/g. This is primarily due to that the ability of SMO to stabilize wax nuclei and the role of γ-Al2O3 nanoparticles as an additional nucleation site. Furthermore, DLVO analysis also revealed that γ-Al2O3 nanoparticles exhibited high colloidal stability, enabling them to facilitate stable Pickering emulsion formation. Finally, microscopic observations demonstrated that both additives could suppress the formation of insoluble paraffinic “house of cards” crystals.

Evaluation of Thermal Properties of Composites Prepared from Pistachio Shell Particles Treated Chemically and Polypropylene.

The purpose of the present work was to prepare polypropylene (PP) matrix composited filled with chemically treated pistachio shell particles (PTx), and evaluate their effect on the composites’ thermal properties. PP-PTx composites were formulated in different PTx content (from 2 to 10 phr) in a mixing chamber, using the melt-mixing process. The PTx were chemically treated using a NaOH solution and infrared spectroscopy (FTIR). According to thermogravimetric analysis (TGA), the treatment of pistachio shell particles resulted in the remotion of lignin and hemicellulose. The thermal stability was evaluated by means of TGA, where the presence of PTx in composites showed a positive effect compared with PP pristine. Thermal properties such as crystallization temperature (Tc), crystallization enthalpy (∆Hc), melting temperature (Tm) and crystallinity were determinate by means differential scanning calorimetry (DSC); these results suggest that the PTx had a nucleation effect on the PP matrix, increasing their crystallinity. Dynamic mechanical analysis (DMA) showed that stiffness of the composites increase compared with that PP pristine, as well as the storage modulus, and the best results were found at a PTx concentration of 4 phr. At higher concentrations, the positive effect decreased; however, they were better than the reference PP.

Wire-sheet assembly construction of boron nitride/single-walled carbon nanotube shape-stabilized phase change composites for light-thermal energy conversion and storage

As one of the most abundant energy, solar energy has already drawn great attention both from academia and industry, but how to use it to the utmost extent is still a formidable challenge for the development of human. Phase change material (PCM) is proved to be one of the most promising technique for storing thermal energy. Herein, we designed and fabricated a three-dimensional (3D) phase change composite (PCC) with excellent light-to-thermal conversion by constructing one-dimensional (1D) linear single-walled carbon nanotubes (SWNTs), two-dimensional (2D) boron nitride nanosheets (BNNSs) and polyethylene glycol (PEG) into a 3D bulk structure. This structure supplies the prepared PCMs with high thermal conductivity, excellent solar-thermal conversion efficiency, and high energy storage density. Results showed that the PCCs displayed a well-defined 3D interconnected structure, and their melting and crystallization enthalpies were 156.36 J/g and 153.33 J/g, respectively, which changed only slightly after 110 thermal cycles. The thermal conductivity of the composites could reach 0.92 W∙m−1∙K−1, which effectively enhanced the thermal response rate. Beyond that, the PCCs exhibited good leakage-proof performance and excellent thermal regulation performance. And the light-to-thermal conversion efficiency of PCCs reached 97.15%. These results indicate that this strategy can be efficiently used to develop novel PCCs with improved comprehensive thermal performances and high light-to-thermal conversion.

Direct and indirect effects on molecular mobility in renewable polylactide-poly(propylene adipate) block copolymers as studied via dielectric spectroscopy and calorimetry.

In this work, we study a series of sustainable block copolymers based on polylactide, PLA, and poly(propylene adipate), PPAd, both polymers being prepared from renewable resources. Envisaging a wide range of future applications in the frame of a green and circular economy, e.g., packaging materials replacing conventional petrochemicals, the employment of PPAd aims at lowering the glass transition and melting temperatures of PLA and, finally, facilitation of the enzymatic degradation and compostability. The copolymers have been synthesized via ring opening polymerization of lactides in the presence of propylene adipate oligomers (5, 15 and 25%). The direct effects on the molecular mobility by the structure/composition are assessed in the amorphous state employing broadband dielectric spectroscopy (BDS) and calorimetry. BDS allowed the recording of local PLA and PPAd dynamics in all cases. The effects on local relaxations suggest favoring of interchain interactions, both PLA-PPAd and PPAd-PPAd. Regarding the more important segmental dynamics, the presence of PPAd leads to faster polymer chain diffusion, as monitored by the significant lowering of the dielectric and calorimetric glass transition temperature, Tg. This suggests the plasticizing role of PPAd on PLA (majority) in combination with the lowering of the average molar mass, Mn, in the copolymers from ∼75 to ∼30 kg mol-1, which is the actual scope for the synthesis of these materials. Interestingly, a strong suppression in fragility (chain cooperativity) is additionally recorded. In contrast to calorimetry and due to the high resolving power of BDS, for the higher PPAd fraction, the weak segmental relaxation of PPAd was additionally recorded. Overall, the recordings suggest a strong increase in free volume and two individual dynamic states, one for 0 and 5% PPAd and another for 15 and 25% PPAd. Within the latter, we gained indications for partial phase nano-separation of PPAd. Regarding indirect effects, these were followed via crystallization. Independent of the method of crystallization, namely, melt or cold, the presence of PPAd led to the systematic lowering of crystallization and melting temperatures and enthalpies. The effects reflect the decrease of crystalline nuclei, which is confirmed by optical microscopy as in the copolymers fewer although larger crystals are formed.

Preparation of exfoliated graphite nanoplates/thermoplastic polyurethane composites with enhanced dielectric properties

In this work, exfoliated graphite nanoplates (xGNPs)/thermoplastic polyurethane (TPU) composites with enhanced dielectric constant and relatively low dielectric loss factor were prepared by an effective method involving solution blending and water precipitating. The wide-angle X-ray diffraction results proved that the xGNPs had been added into the TPU. Furthermore, the microstructure of the resultant xGNPs (2 wt.%)/TPU composite was investigated by scanning electron microscopy (SEM). The SEM images showed that there were many xGNPs in the TPU elastomer matrix. According to differential scanning calorimetry the melting peak temperature and the crystallization peak temperature of the xGNPs/TPU composites were lower than those of the pure TPU but the melting enthalpy and the crystallization enthalpy of the xGNPs/TPU composites were higher than those of the pure TPU. More importantly, the dielectric constant at 1000 Hz and the thermal conductivity of the xGNPs/TPU composites obviously increased in comparison with those of the pure TPU, especially when the xGNPs content was 2 wt.%.

The Synthesis of Biodegradable Poly(L-Lactic Acid)-Polyethylene Glycols Copolymer/Montmorillonite Nanocomposites and Analysis of the Crystallization Properties

This study makes use of polycondensation to produce poly (L-lactic acid)-(polyethylene glycols), a biodegradable copolymer, then puts it with organically modified montmorillonite (o-MMT) going through an intercalation process to produce a series of nanocomposites of PLLA-PEG/o-MMT. The exfoliation and intercalation of the montmorillonite-layered structure could be found through X-ray diffraction and transmission electron microscopy. The lower the molecular weight of poly (ethylene glycol), the more obvious the exfoliation and dispersion. The nanocomposites were investigated under non-isothermal crystallization and isothermal crystallization separately via differential scanning calorimetry (DSC). After the adding of o-MMT to PLLA-PEG copolymers, it was found that the PLLA-PEG nanocomposites crystallized slowly and the crystallization peak tended to become broader during the non-isothermal crystallization process. Furthermore, the thermal curve of the non-isothermal melt crystallization process of PLLA-PEG copolymers with different proportions of o-MMT showed that the melting point decreased gradually with the increase of o-MMT content. In the measurement of isothermal crystallization, increasing the o-MMT of the PLLA-PEG copolymers would increase the t1/2 (crystallization half time) for crystallization and decrease the value of ΔHc. However, the present study results suggest that adding o-MMT could affect the crystallization rate of PLLA-PEG copolymers. The o-MMT silicate layer was uniformly dispersed in the PLLA-PEG copolymers, forming a nucleating agent. The crystallization rate and the regularity of the crystals changed with the increase of the o-MMT content, which further affected the crystallization enthalpies.

Silica-Based Core-Shell Nanocapsules: A Facile Route to Functional Textile

In this work, we present a surfactant-free miniemulsion approach to obtain silica-based core-shell nanocapsules with a phase change material (PCM) core via in-situ hydrolytic polycondensation of precursor hyperbranched polyethoxysiloxanes (PEOS) as silica shells. The obtained silica-based core-shell nanocapsules (PCM@SiO2), with diameters of ~400 nm and silica shells of ~14 nm, reached the maximum core content of 65%. The silica shell had basically no significant influence on the phase change behavior of PCM, and the PCM@SiO2 exhibited a high enthalpy of melt and crystallization of 123–126 J/g. The functional textile with PCM@SiO2 has been proposed with thermoregulation and acclimatization, ultraviolet (UV) resistance and improved mechanical properties. The thermal property tests have shown that the functional textile had good thermal stability. The functional textile, with a PCM@SiO2 concentration of 30%, was promising, with enthalpies of melting and crystallization of 27.7 J/g and 27.8 J/g, and UV resistance of 77.85. The thermoregulation and ultraviolet protection factor (UPF) value could be maintained after washing 10 times, which demonstrated that the functional textile had durability. With good thermoregulation and UV resistance, the multi-functional textile shows good prospects for applications in thermal comfort and as protective and energy-saving textile.

Full Factorial Design Analysis and Characterization of Polyethylene, Starch and Aloe Vera Gel Thin Film Formulation

The polyethylene-thermoplastic (PE/TPS) based film was introduced many years ago, but the compatibility of PE/TPS still an issue because synthetic compatibilizer has a safety drawback. In this work, aloe vera (AV) was introduced as a compatibilizer to enhance stress and characteristics of PE/TPS film. This paper determines the optimum PE/TPS/AV film formulation using full factorial design (FFD) analysis. Melt blending and hot-press techniques were used to prepare the film. Four selected PE/TPS/AV samples were chosen to discuss mechanical properties, functional groups, thermal degradation, and thermal properties changes. Based on FFD, PE was the most significant material that caused substantial changes in the film's mechanical properties. Concurrently, the interaction between PE/TPS and TPS/AV significantly influenced the value of the secant modulus. The addition of AV into TPS improved the stress and reduced the strain. New peaks are present in TPS/AV that share the same functional group with PE. Thus, improving the stress of the film. The presence of AV caused peaks 2916 cm^-1and 2849 cm^-1 of TPS to strengthen at once; the thermal degradation increases tremendously from 282 °C to 354.70 °C. The melting temperature showed a reduction when TPS/AV was added into PE, but the crystallization temperature did not significantly change. However, significant changes occurred for crystallization enthalpy when TPS/AV was incorporated in PE at once, affecting the degree of crystallinity. In conclusion, AV was suggested to act as a compatibilizer/crosslinker or plasticizer to improve PE film packaging properties.

Effect of Dietary Fiber and Thermal Conditions on Rice Bran Wax-Based Structured Edible Oils.

In this work, extra-virgin olive oil (EVO)- and sunflower oil (SFO)-based oleogels were structured using rice bran wax (RBW) at 10% by weight (w/w). Bamboo fiber milled with 40 (BF40), 90 (BF90) and 150 (BF150) µm of average size was added as a structuring agent. The effect of fiber addition and cooling temperature (0, 4, and 25 °C) on thermal and structural parameters of achieved gels was assessed by rheological (both in rotational and oscillatory mode), texture, and differential scanning calorimetry tests. Oleogelation modified the rheological behavior of EVO and SFO, thus shifting from a Newtonian trend typical of oils to a pseudoplastic non-Newtonian behavior in gels. Moreover, oleogels behaved as solid-like systems with G′ > G″, regardless of the applied condition. All samples exhibit a thermal-reversible behavior, even though the presence of hysteresis suggests a partial reduction in structural properties under stress. Decreasing in cooling temperature negatively contributed to network formation, despite being partially recovered by low-granulometry fiber addition. The latter dramatically improved either textural, rheological, or stability parameters of gels, as compared with only edible oil-based systems. Finally, wax/gel compatibility affected the crystallization enthalpy and final product stability (gel strength) due to different gelator–gelator and gelator–solvent interactions.

Structural, physical and degradation characteristics of polyvinyl alcohol/esterified mung bean starch/gliadin ternary composite plastic

Biodegradable composite plastics with better performance can replace synthetic polymer materials in packaging fields such as food and industry. In this study, solvent casting produced different proportions of composite plastics based on polyvinyl alcohol (PVA), esterified starch, and gladin. Pure PVA plastics had high elongation at break value and light transmittance. The PVA/starch/ gliadin plastics had lower hydrophilicity, higher tensile properties, and higher biodegradability despite having a lower elongation at break than the pure PVA plastics. Scanning Electron Microscope, Atomic Force Microscopy, X-ray diffraction, Fourier Infrared Spectra, and light transmittance showed that the PVA/starch/gliadin plastic had good compatibility through the hydrogen bond formation. Various proportions of plastics exhibited different colors due to the different component ratios. Simultaneously, as the content of esterified starch increased, the melting enthalpy and crystallization enthalpy of composite plastics showed an increasing trend. When the PVA accounted for 25% and the starch/gladin was 75%/25%, the hydrophilicity of composite plastics was the lowest, and significantly lower than that of PVA plastics. When PVA accounted for 50% and starch/gladin was 75%/25%, the tensile properties of ternary composite plastics were the highest; when PVA accounted for 75%, and starch accounted for 25%, the elastic modulus of PVA/starch plastics was the highest. Moreover, composite plastics had a higher biodegradability than pure PVA plastics. The outstanding advantages of environment-friendly PVA/starch/gliadin plastics in different proportions can meet various aspects of actual production, such as water-sensitive goods packaging and heavy object bearing.