透明结晶环烯烃聚合物球晶形态及结晶行为的光散射研究

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing Pub Date : 2025-05-08 DOI:10.1016/j.polymertesting.2025.108845

Hironari Sudeji , Kousuke Sugeno , Hiromu Saito

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引用次数: 0

摘要

采用450 nm短波激光光散射的方法研究了一种新型的辛二规氢化聚内二环戊二烯（SH-DCP）晶体环烯烃聚合物的球晶形态和结晶行为。在高透明晶化的SH-DCP中观察到四叶草交叉极化光散射模式，表明形成了由径向排列的晶体组成的球晶。等温熔体结晶过程中，圆形Hv散射模式转变为四叶草模式，散射曲线估计的球晶半径减小，表明结晶过程中球晶结构由随机排列转变为径向排列，小球晶数量增加。在结晶后期，由于晶体排列均匀化，各球晶的折射率差减小，平行极化光散射强度减小，接近弱Hv光散射强度，这可能有助于SH-DCP结晶的透明度。利用短波激光进行光散射测量是评价由小球粒组成的透明结晶聚合物的球粒形貌和结晶行为的有力手段。

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Light scattering studies on spherulite morphology and crystallization behavior of transparent crystalline cyclo olefin polymer

We investigated the spherulite morphology and crystallization behavior in a novel crystalline cyclo olefin polymer of syndiotactic hydrogenated poly (endo-dicyclopentadiene) (SH-DCP) by light scattering measurements using a short-wavelength laser at 450 nm. A four-leaf clover Hv (cross-polarized) light scattering pattern was observed in the highly transparent crystallized SH-DCP, indicating the formation of spherulite consisting of radially arranged crystals. During the isothermal melt crystallization, a circular Hv scattering pattern changed to yield the four-leaf clover pattern and the spherulite radius estimated from the scattering profiles decreased, suggesting that the structure in the spherulite changed from randomly arranged crystals to radially arranged crystals, and the number of smaller spherulites increased during the crystallization. At the late stage of crystallization, the Vv (parallel-polarized) light scattering intensity decreased and was close to the weak Hv one as the refractive index difference in each spherulite decreased due to the homogenization of the crystal arrangement, which may contribute to the transparency of the crystallized SH-DCP. Light scattering measurement using a short-wavelength laser is powerful for evaluating the spherulite morphology and crystallization behavior of transparent crystalline polymers composed of small spherulites.

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.