Crystallization behavior, structure, morphology, and thermal properties of crystalline and amorphous stereo diblock copolymers, poly(l-lactide)-b-poly(dl-lactide)

2020 ◽  
Vol 11 (36) ◽  
pp. 5711-5724 ◽  
Author(s):  
Hideto Tsuji ◽  
Kazumasa Iguchi ◽  
Kohji Tashiro ◽  
Yuki Arakawa
Keyword(s):  
Thermal Properties ◽  
Crystallization Behavior ◽  
Diblock Copolymers ◽  
Structure Morphology

Some fractions of poly(dl-lactide) chains were confined in the amorphous regions between the crystalline regions, but the remaining parts of the poly(dl-lactide) chains should have been located outside of the alternately layered crystalline and amorphous regions.

scholarly journals Comparative analysis of crystallization behavior induced by different mineral fillers in polypropylene nanocomposites

2020 ◽  
Vol 10 ◽  
pp. 184798042092275
Author(s):  
Luciana A. Castillo ◽  
Silvia E. Barbosa
Keyword(s):  
Thermal Properties ◽  
Comparative Analysis ◽  
Crystallization Behavior ◽  
Morphological Changes ◽  
Filler Concentration ◽  
Mineral Particle ◽  
Scanning Calorimetry ◽  
Crystalline Phases ◽  
Polypropylene Nanocomposites ◽  
Mineral Fillers

A comparative analysis of crystallization behavior induced by several mineral fillers in polypropylene nanocomposites was performed. Morphological changes and thermal properties of nanocomposites were evaluated, considering the influence of shape, crystalline morphology, and concentration of mineral particles. For this study, hydrated magnesium silicates with different particle morphologies, such as platelets (talc) and fibers (sepiolite), were used for nanocomposites. In addition, to analyze the effect of mineral crystallinity on nanocomposites, talc and sepiolite from different origin and genesis were selected. Nanocomposites were compounded and injection molded, using different filler concentration (0, 1, and 3% w/w) for each mineral particle. To evaluate the particle influence on nanocomposite crystallinity, X-ray diffraction was used to determine crystalline phases and crystal orientation, meanwhile differential scanning calorimetry was performed to obtain thermal properties. Main results revealed that talc has a higher nucleating effect on polypropylene matrix than sepiolite fibers, regardless of their origin and genesis. Meanwhile, a transcrystalline layer that surrounds the fiber surface is observed for nanocomposite containing sepiolite. Moreover, Argentinean talc induces different crystalline phases in nanocomposite with respect to Australian one, which partly influences on mechanical properties.

Solution Crystallization Behavior of Crystalline−Crystalline Diblock Copolymers of Poly(ethylene oxide)-block-poly(ε-caprolactone)

2010 ◽  
Vol 43 (14) ◽  
pp. 6113-6119 ◽  
Author(s):  
Ryan M. Van Horn ◽  
Joseph X. Zheng ◽  
Hao-Jan Sun ◽  
Ming-Siao Hsiao ◽  
Wen-Bin Zhang ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Crystallization Behavior ◽  
Diblock Copolymers ◽  
Solution Crystallization ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Diblock Copolymers Based on 1,4-Dioxan-2-one andɛ-Caprolactone: Characterization and Thermal Properties

2004 ◽  
Vol 205 (13) ◽  
pp. 1764-1773 ◽  
Author(s):  
Jean-Marie Raquez ◽  
Philippe Degée ◽  
Ramani Narayan ◽  
Philippe Dubois
Keyword(s):  
Thermal Properties ◽  
Diblock Copolymers

Thermal properties and crystallization behavior of thermoplastic starch/poly(ɛ-caprolactone) composites

2014 ◽  
Vol 102 ◽  
pp. 746-754 ◽  
Author(s):  
Jie Cai ◽  
Zhouyi Xiong ◽  
Man Zhou ◽  
Jun Tan ◽  
Fanbing Zeng ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Crystallization Behavior ◽  
Thermoplastic Starch

Crystallization behavior and mechanical properties of poly(lactic acid) complex fiber toughened by carbon nanotube nanocapsules

2017 ◽  
Vol 88 (14) ◽  
pp. 1616-1627 ◽  
Author(s):  
Shu-qiang Liu ◽  
Gai-hong Wu ◽  
Yun-chao Xiao ◽  
Hong-xia Guo ◽  
Fen-juan Shao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Lactic Acid ◽  
Thermal Properties ◽  
Carbon Nanotube ◽  
Crystallization Behavior ◽  
Poly Lactic Acid ◽  
Acid Complex ◽  
Main Obstacle ◽  
Industrial Areas

Poly(lactic acid) (PLA) fiber, owing to its biocompatibility and biodegradability, could be widely used in many related industrial areas. However, high brittleness has been the main obstacle to expanding its applications. So in this paper, carbon nanotube (CNT) nanocapsules were designed to toughen PLA and further reported their effect on the crystallization behavior and mechanical properties of PLA complex fiber. These designed CNT nanocapsules successfully solved the agglomeration of CNTs within the PLA matrix as well as the compatibility issue. In addition, the morphological, mechanical, optical and thermal properties of PLA complex fibers were also studied. The addition of CNT nanocapsules obviously improved the crystallization behavior of PLA fiber. Furthermore, compared with pure PLA, the tensile strength of PLA complex fiber was enhanced by 30.62% and the elongation by 32.2%, so the designed CNT nanocapsules could be used as a toughener for PLA fiber. This research benefits the extension of PLA applications where toughness is an important factor.

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