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- 저자 : Guangzhu Ding (검색결과 3 건)
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Guangzhu Ding,Lei Chen,Jieping Liu 한국고분자학회 2015 폴리머 Vol.39 No.6
In our previous work, the miscibility and rheology behaviors of poly(3-hydroxybutyrate)/poly(p-vinylphenol) (PHB/PVPh) blends with homogeneous amorphous compositions had been studied. In this work, the rheological characteristics and physical gelation point have been investigated for the miscible PHB/PVPh blends with crystalline/amorphous compositions. The time sweep and frequency sweep of dynamic oscillatory experiment are discussed in details. The storage modulus G’ and loss modulus G’’ grow gradually along with the isothermal crystallization time, but the storage modulus G′ exceeds the loss modulus G″ in the end. The physical gelation phenomena can be observed according to the power law method. In the flat region of loss tangent vs. angular frequency curves, the physical gelation point (tg) of the PHB/PVPh 90/10 comes forth prior to the PHB/PVPh 80/20 during the liquid-solid transition process, which results mainly from the various isothermal crystallization rate of PHB component within PHB/PVPh blends.
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The Transition of Molecular Alignment of Poly(ethylene oxide) Film via Thermal Annealing
Hangyu Zhang,Guangzhu Ding,Kun Wu,Chenguang Cai,Jieping Liu 한국고분자학회 2022 Macromolecular Research Vol.30 No.4
The molecular alignment of polymer film has attracted a lot of attentions due to its complicated process affected by processing conditions and dominating polymer applications. Here we demonstrate that the annealing process can not only change the surface morphology of annealed poly(ethylene oxide) (PEO) film significantly but also induce the formation of highly oriented lamellar structure. It indicates that sheaf-like and cluster banding morphology can be both found obviously on the surface of pristine film. However, there is only sheaf-like morphology and sporadical cluster banding cannot be found obviously on the surface of annealed film. Then, there are both tilt and flat-on orientations of PEO crystalline for pristine film. But, single flat-on orientation of PEO crystalline is present and tilt orientation mode is absent for annealed films. Furthermore, the transition of molecular alignment of PEO film via thermal annealing cannot be affected by the thickness and temperature.
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Qing Chen,Guohui Zhang,Kaixuan Wang,Chao Wang,Guangzhu Ding,Jieping Liu 한국고분자학회 2017 Macromolecular Research Vol.25 No.4
The growth of spherulites is an intricate process and the final morphology is dependent on many process conditions. The spherulitic morphologies of poly(3-hydroxybutyrate) (PHB) crystallized from melt film are observed under various crystallization temperature gradient (the non-isothermal crystallization) in this work. Characterization reveals that the crystal morphologies (banded or nonbanded spherulites) of PHB film are determined significantly by nucleation temperature (not growth temperature). Interestingly, banded spherulites, nucleated between 60-135 oC, are able to grow completely above growth temperature 135 oC or below 60 oC yet and non-banded shperulites nucleated at above 135 oC can also develop steadily till below growth temperature 135 oC under temperature gradient condition. Therefore, the conclusion drawn from the temperature gradient or non-isothermal process is novel and different from the result of isothermal crystallization (morphology mainly depending on the growth temperature). In addition, the growth and evolution kinetics of banded and non-banded spherulites are both investigated for some polymer thin films under the temperature gradient in detail.
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