Crystal growth rates and master curves of poly(ethylene succinate) and its copolyesters using a nonisothermal method

Tsai, Chia‐Jung; Chen, Ming; Lu, Hsin-Ying; Chang, Wen-Liang; Chen, Chi He

doi:10.1002/polb.21980

Cited by 8 publications

(4 citation statements)

References 17 publications

(28 reference statements)

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“…This process allows molecular-scale growth by crystals attaching themselves to nucleating structures through a specific interaction that arises from the nature of the specific constituent molecules. Thus, each solid-state crystal has distinct growth properties following geometrical and chemical characteristics of their molecules6789. During the past few decades, DNA has stood out as a potential material for crystals because of its remarkable ability to construct complex architecture.…”

mentioning

confidence: 99%

Quantitative analysis of molecular-level DNA crystal growth on a 2D surface

Lee

Hamada

Hwang

et al. 2013

Sci Rep

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Crystallization is an essential process for understanding a molecule's aggregation behavior. It provides basic information on crystals, including their nucleation and growth processes. Deoxyribonucleic acid (DNA) has become an interesting building material because of its remarkable properties for constructing various shapes of submicron-scale DNA crystals by self-assembly. The recently developed substrate-assisted growth (SAG) method produces fully covered DNA crystals on various substrates using electrostatic interactions and provides an opportunity to observe the overall crystallization process. In this study, we investigated quantitative analysis of molecular-level DNA crystallization using the SAG method. Coverage and crystal size distribution were studied by controlling the external parameters such as monomer concentration, annealing temperature, and annealing time. Rearrangement during crystallization was also discussed. We expect that our study will provide overall picture of the fabrication process of DNA crystals on the charged substrate and promote practical applications of DNA crystals in science and technology.

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mentioning

confidence: 99%

Quantitative analysis of molecular-level DNA crystal growth on a 2D surface

Lee

Hamada

Hwang

et al. 2013

Sci Rep

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“…The non-isothermal crystallization experiment is an important method to study the crystallization kinetics of polymers. The advantages of this method are: (i) the non-isothermal crystallization process can be considered as the superposition of each individual isothermal crystallization, , enabling us to understand the crystallization kinetics of polymers by combining the non-isothermal and isothermal studies; (ii) the non-isothermal crystallization experiments can also extend the crystallization temperature to much lower values where isothermal studies are unavailable; and (iii) the non-isothermal crystallization experiments are close to practical crystallization conditions in polymer processing. In this work, the non-isothermal DSC exothermic curves of unimodal and bimodal PEs were measured at different cooling rates to understand the impact of MWD shape on their crystallization kinetics as shown in Figure S8.…”

Section: Resultsmentioning

confidence: 99%

Molecular Weight Distribution Shape Dependence of the Crystallization Kinetics of Semicrystalline Polymers Based on Linear Unimodal and Bimodal Polyethylenes

Long

Dong

et al. 2023

ACS Appl. Polym. Mater.

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The manipulation of the crystallization kinetics and crystallinity of polymers without altering their chemical composition, chain structure, or average molecular weight is challenging, while little attention is paid to the role of molecular weight distribution (MWD) shape. In this work, a series of well-defined linear unimodal and bimodal polyethylenes (PEs) with molecular weights ranging from 300 k to 1200 k g/mol were synthesized to serve as a model system to study the impact of bimodal MWD shape on the crystallization kinetics of semicrystalline polymers in comparison with unimodal MWD shape at the same weight-average molecular weight (M w). It is shown that PEs with a bimodal shape exhibit a faster nucleation rate and crystallization rate with a smaller lamellar width at low isothermal temperatures. A higher crystallization enthalpy of bimodal PEs is shown in non-isothermal experiments. The mechanism behind this is elucidated, which suggests that MWD shapes mainly affect the small-scale nucleation process without altering the large-scale growth process. This first systematic comparative study on the crystallization kinetics of linear unimodal and bimodal PEs gives insight into tailoring the crystallization behavior of semicrystalline polymers from an MWD shape perspective.

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“…The isothermal crystallization activation energy of polymers is usually calculated using the Avrami parameter. The crystallization rate constant (k) can be approximated using the Arrhenius equation as follows [49][50][51]:…”

Section: Isothermal Crystallization Activation Energymentioning

confidence: 99%

Effect of amino silane coupling agent on crystallization behavior of polyamide 612/glass fiber composites

Yeh,

Mao,

Chen

et al. 2024

Preprint

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Amino silane coupling agents (0, 0.5, 1.0, and 2.0wt %) were added to polyamide 612 (PA612)-based composites reinforced with short glass fibers (GFs) to investigate the effect of the additives on the crystallization kinetics, which were tested using injection molding. The isothermal crystallization activation energies and the kinetic parameters of the crystallization processes of the samples were determined using the Arrhenius, Avrami, and Lauritzen–Hoffman models. The kinetic calculations revealed that the addition of a silane coupling agent significantly benefitted the GFs in terms of slowing down the isothermal crystallization rate of PA612. Moreover, treating the surface of GF-reinforced PA612 composites with a silane coupling agent induced optimum performance of the injection-molded PA612 parts. This is because the GFs enhanced the mechanical properties while the coupling agent delayed crystallization and improved the GF-substrate adhesion. Moreover, compared with a coupling agent-free PA612/GF composite, the activation energy of crystallization was reduced by a factor of over 1.5 from ΔEa -92.84 to ΔEa -163.55 J/mole with the addition of a coupling agent. The experimental results demonstrated that the PA612/GF composite with 1.0wt % coupling agent displayed the highest absolute value of crystallization activation energy (|ΔEa|).

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Crystal growth rates and master curves of poly(ethylene succinate) and its copolyesters using a nonisothermal method

Cited by 8 publications

References 17 publications

Quantitative analysis of molecular-level DNA crystal growth on a 2D surface

Quantitative analysis of molecular-level DNA crystal growth on a 2D surface

Molecular Weight Distribution Shape Dependence of the Crystallization Kinetics of Semicrystalline Polymers Based on Linear Unimodal and Bimodal Polyethylenes

Effect of amino silane coupling agent on crystallization behavior of polyamide 612/glass fiber composites

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