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Open research questions in Polymer crystallization and properties

136 gap statements mined from Polymer crystallization and properties papers in our 4.5M-paper local library, which holds 1,610 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • There is a need to understand the degradation mechanisms of antioxidants in engineered polymers. The paper identifies a gap in the evaluation of antioxidant degradation mechanisms. The review aims to fill this gap by exploring the role of radical sources, polymer types, antioxidant types, and measurement methods.

    Mechanistic Evaluation of Antioxidant Degradation in Engineered Polymers: From Oxidative Induction Time-Based Analysis to Molecular Characterization · 2026 · DOI

  • The need for improving the mechanical properties of recycled PET. The lack of understanding of the effect of chain extender content on the intrinsic viscosity of the polymer. The need for determining the degree of crystallinity and thermal behavior of the modified polymer.

    Evaluation of the efficiency of a trifunctional chain extender in the mechanical recycling of polyethylene terephthalate using intrinsic viscosity conversion · 2026 · DOI

  • It highlights the need to distinguish biodegradability from recycling-system compatibility to protect the quality and value of HDPE recyclates. The paper also identifies a gap in the development of effective mitigation routes to address PLA contamination.

    The Drop-In Delusion: Technical and Systemic Impacts of PLA Contamination on the HDPE Circular Economy · 2026 · DOI

  • Mastication, a crucial processing step, reduces raw NR molecular weight via chain scission, yet its effects on SIC and mechanical performance remain incompletely understood.

    The impact of mastication-induced molecular weight reduction on the strain-induced crystallization and mechanical properties of natural rubber · 2026 · DOI

  • However, such effect is not fully investigated within systems with lower chain structural regularity and inferior crystallization ability.

    Effect of molecular weight on the molecular chain orientation and strain-induced crystallization behaviors of HNBR under uniaxial stretching · 2026 · DOI

  • Although oriented PVC (OPVC) pipes achieve high-pressure performance through hoop expansion, the quantitative relationships between three-dimensional architecture and mechanical anisotropy in real pipe walls has not been fully quantified.

    3D architecture and anisotropic mechanical performance of commercial oriented PVC pressure pipes · 2026 · DOI

  • Modulating the β -crystalline phase and adding elastomers have traditionally been used to overcome the brittleness of polypropylene (PP); however, the synergistic mechanisms of these components in enhancing low temperatures toughness remain insufficiently explored.

    β-crystals aied greater energy absorbing ethylene–propylene rubber in polypropylene blends for outstanding low-temperature toughness · 2024 · DOI

  • In particular, the characterization of crystallization and melting of P4HB by fast scanning calorimetry (FSC) has not been reported previously.

    Crystallization and melting of Poly(4-hydroxybutyrate) characterized by fast scanning calorimetry · 2024 · DOI

  • Unfortunately, the crystallization and melting behavior of P4HB has not been systematically studied, due to the rapid crystallization near room temperature.

    Crystallization and melting of Poly(4-hydroxybutyrate) characterized by fast scanning calorimetry · 2024 · DOI

  • There is a need to optimize crystallization kinetics to overcome the bottlenecks in the industrialization of nylon 6.

    Crystallization behavior and mechanical properties of nylon 6 modified with different nucleating agents · 2026 · DOI

  • There is a need to evaluate the safety and reliability of these materials under simulated pipeline conditions. The study aims to address this gap by investigating the swelling behavior of different rubber materials.

    Swelling Mechanism of Rubber Sealing Materials in Methanol Transportation Pipelines · 2026 · DOI

  • The lack of efficient methods for polypropylene recycling. The need for harsh conditions or costly hydrogen in existing methods. The limited understanding of the role of W–O–Zr ensembles in catalysts.

    Interfacial W–O–Zr ensembles in tungstated zirconia catalysts enable efficient hydrogen-free recycling of polypropylene waste · 2026 · DOI

  • Future research will focus on overcoming the observed crystal growth limitation to enable the formation of larger crystals with narrower particle size distributions, which should result in lower filter cake resistance and more reproducible filtration results.

    Understanding the Impact of Different Nucleation Strategies on Bis(2-hydroxyethyl) Terephthalate Crystallization from a Glycolysis Reaction Mixture · 2026 · DOI

  • However, the effect of PEEK melt fluidity on the crystallization kinetics and crystal morphology of CF/PEEK composites under varying cooling rates remains to be elucidated.

    Effect of Polyether Ether Ketone Melt Fluidity on Crystallization Behavior of Carbon Fiber Reinforced Polyether Ether Ketone Composites · 2026 · DOI

  • Efficient glycolytic depolymerization of waste polyethylene terephthalate (PET) is critical for sustainable resource recycling, yet the effect of specific surface area—a key structural parameter of PET fibers—on reaction kinetics and depolymerization mechanisms remains unclear.

    The Influence of Specific Surface Area on the Glycolysis Mechanism of PET Fibers · 2026 · DOI

  • Further studies can investigate the effect of other factors on the SSP process, such as PET particle size and reaction medium. The development of more accurate mathematical models can help improve the prediction of IV and MFI values.

    Influence of solid-state polycondensation conditions on the intrinsic viscosity of recycled poly(ethylene terephthalate) · 2026 · DOI

  • However, their processability is challenging and the relationship between thermal behavior, microstructure, and mechanical performance is poorly understood.

    Impact of thermal treatment on the crystallization behavior and mechanical properties of semicrystalline PLGA · 2026 · DOI

  • Further research in this field is critical because newly synthesized antioxidants continue to be developed, - Drawing a clear conclusion from a single measurement method is difficult, so comprehensive analyses must be conducted to support each result, - It is difficult to distinguish whether antioxidant loss is induced by diffusion phenomenon and/or by chemical degradation, - Future studies should integrate…

    Mechanistic Evaluation of Antioxidant Degradation in Engineered Polymers: From Oxidative Induction Time-Based Analysis to Molecular Characterization · 2026 · DOI

  • Investigating the effect of other factors on the chain extension reaction, - Examining the architectural changes in the rPET, - Studying the mechanical thermal properties of the modified…

    Evaluation of the efficiency of a trifunctional chain extender in the mechanical recycling of polyethylene terephthalate using intrinsic viscosity conversion · 2026 · DOI

  • The VoF method becomes computationally prohibitive when resolving nanoscale features over a macroscopic domain, - The global mesh refinement is not feasible due to the large domain size, - The simulation is limited to a two-dimensional computational domain, - The assumptions of axisymmetry are made, - The rheological properties of the mixture are used instead of the individual…

    Simplified dual-scale simulation framework for computational modeling of nanofibrillation phenomena via fiber in fiber technology with experimental data · 2026 · DOI

  • Further study on the effects of PLA contamination on HDPE recyclates - Research on effective upstream sorting and compatibilization…

    The Drop-In Delusion: Technical and Systemic Impacts of PLA Contamination on the HDPE Circular Economy · 2026 · DOI

  • Quantitative statistical image analysis on fracture surfaces was not carried out, - Analysis such as surface mapping to obtain the PP bonding area fraction would be interesting for future work, - Only ESR spectra, instead of spin densities…

    Electron Beam Irradiation for Impact Strength Enhancement of Kevlar Fiber-Reinforced Polypropylene · 2026 · DOI

  • Analysis such as surface mapping to obtain the PP bonding area fraction, - Investigating the effect of HLEBI on other types of fiber-reinforced…

    Electron Beam Irradiation for Impact Strength Enhancement of Kevlar Fiber-Reinforced Polypropylene · 2026 · DOI

  • Further optimization of the catalyst composition and synthesis method. Investigation of the scalability and industrial applicability of the method. Exploration of the use of tungstated zirconia catalysts for other polyolefin recycling applications.

    Interfacial W–O–Zr ensembles in tungstated zirconia catalysts enable efficient hydrogen-free recycling of polypropylene waste · 2026 · DOI

  • The lack of understanding of the formation mechanism of the crystal morphology of Guanidinoacetic acid - The need for mechanistic insights into the effect of polymeric additives on crystal growth and powder properties - The requirement for theoretical guidance for the regulation of crystallization processes via additive…

    The Formation Mechanism of the Crystal Morphology of Guanidinoacetic Acid: Selective Adsorption of Additives and Solute Diffusion · 2026 · DOI

Most-cited papers in Polymer crystallization and properties

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Open questions raised by papers listed on this page include: (1) There is a need to understand the degradation mechanisms of antioxidants in engineered polymers (“Mechanistic Evaluation of Antioxidant Degradation in Engineered Polymers: From…”, 2026); (2) The lack of understanding of the effect of chain extender content on the intrinsic viscosity of the polymer (“Evaluation of the efficiency of a trifunctional chain extender in the…”, 2026); (3) Mastication, a crucial processing step, reduces raw NR molecular weight via chain scission, yet its effects on SIC and mechanical performance remain incompletely understood (“The impact of mastication-induced molecular weight reduction on the…”, 2026); (4) Such effect is not fully investigated within systems with lower chain structural regularity and inferior crystallization ability (“Effect of molecular weight on the molecular chain orientation and…”, 2026); (5) There is a need to optimize crystallization kinetics to overcome the bottlenecks in the industrialization of nylon 6 (“Crystallization behavior and mechanical properties of nylon 6 modified with…”, 2026). 136 gap statements have been mined from Polymer crystallization and properties papers in our 4.5M-paper local library, which holds 1,610 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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