Crystallization behavior of poly(p-dioxanone) with cyclodextrin complex and nucleation mechanism discussion

RSC Advances ◽  
2016 ◽  
Vol 6 (90) ◽  
pp. 87169-87178 ◽  
Author(s):  
Xiao-bo Xu ◽  
Qing Li ◽  
Cheng-dong Xiong
Keyword(s):  
Inclusion Complex ◽  
Crystallization Behavior ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
Nucleation Mechanism ◽  
Solution Technique ◽  
Cyclodextrin Complex

In the interest of improving the crystallization rate of poly(p-dioxanone) (PPDO), an inclusion complex (IC) based on β-cyclodextrin (β-CD) and polyglycolide (PGA) serving as a green nucleating agent for PPDO was achieved by a solution technique.

Effect of the Nucleating Agent BN on Crystallization Properties of P(3HB-co-4HB)

2012 ◽  
Vol 627 ◽  
pp. 827-830
Author(s):  
Bing Xin Sun ◽  
Xu Qiao Feng ◽  
Cheng Zhi Chuai ◽  
Ying Guo ◽  
Si Luo
Keyword(s):  
Crystal Structure ◽  
Crystallization Behavior ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
Structure And Morphology ◽  
Crystallization Properties

The crystallization properties of P(3HB-co-4HB) modified with nucleating agent BN was studied. DSC is used to analyze the melting crystallization behavior and POM is used to characterize crystal structure and morphology. The results show the incorporation of BN decreased the spherulite size, increased the crystallization rate and improved the crystallization properties of P(3HB-co-4HB).

Crystallization Behavior of PLA/PEG/Nucleating Agent Blends

2013 ◽  
Vol 807-809 ◽  
pp. 578-581 ◽  
Author(s):  
Jin Xu Dai ◽  
Qiang Yang ◽  
Bao Jian Liu
Keyword(s):  
Crystal Structure ◽  
Polyethylene Glycol ◽  
Crystallization Behavior ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
Nucleating Agents ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crystallization Ability ◽  
Co Precipitation

A series of PLA blends were prepared by solution co-precipitation of polylactide (PLA), polyethylene glycol (PEG) and different crystallization nucleating agents. The crystallization behavior of blends was investigated by differential scanning calorimeter (DSC) and X-ray diffraction (XRD). The results showed that the crystallization ability of PLA blends was accelerated by plasticizer PEG, but the crystal structure of the obtained PLA blends was imperfect; the crystal structure and crystallization rate of the PLA blends were improved with the addition of nucleating agent, moreover, the crystallinity was 34.1% and 36.5%, respectively.

scholarly journals UIO-66 as Nucleating Agent on the Crystallization Behavior and Properties of Poly(Ethylene Terephthalate)

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2266
Author(s):  
Yue Yin ◽  
Yuan Wang ◽  
Linghui Meng
Keyword(s):  
Tensile Strength ◽  
Specific Surface ◽  
Crystallization Temperature ◽  
Crystallization Behavior ◽  
Ethylene Terephthalate ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
High Specific Surface Area ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

In this study, not only was the similar terephthalate structure between UIO-66 and PET utilized to improve compatibility, but the Zr4+ exposed by defects of UIO-66 was also utilized to improve the interaction between PET and UIO-66. Furthermore, PET nanocomposites with different contents of UIO-66 were also fabricated. Due to the high specific surface area and coordination of Zr4+, UIO-66 has high nucleation efficiency in the PET matrix. Compared with pure PET, the crystallization rate of PET/UIO-66 nanocomposite is significantly increased, and the crystallization temperature of PET-UIO66-1 is significantly increased from 194.3 °C to 211.6 °C. In addition, the tensile strength of nanocomposites has also been improved due to coordination.

scholarly journals Significantly Enhanced Crystallization of Poly(ethylene succinate-co-1,2-propylene succinate) by Cellulose Nanocrystals as an Efficient Nucleating Agent

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 224
Author(s):  
Siyu Pan ◽  
Zhiguo Jiang ◽  
Zhaobin Qiu
Keyword(s):  
Crystal Structure ◽  
Cellulose Nanocrystals ◽  
Crystallization Behavior ◽  
Crystallization Process ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
Melt Crystallization ◽  
Crystalline Morphology ◽  
Poly Ethylene

Poly(ethylene succinate-co-1,2-propylene succinate) (PEPS) is a novel aliphatic biodegradable polyester with good mechanical properties. Due to the presence of methyl as a side group, the crystallization rate of PEPS is remarkably slower than that of the poly(ethylene succinate) homopolymer. To promote the potential application of PEPS, the effect of cellulose nanocrystals (CNC) on the crystallization behavior, crystalline morphology, and crystal structure of PEPS was investigated in this research with the aim of increasing the crystallization rate. CNC enhanced both the melt crystallization behavior of PEPS during the cooling process and the overall crystallization rate during the isothermal crystallization process. The crystallization rate of PEPS became faster with an increase in CNC content. The crystalline morphology study directly confirmed the heterogeneous nucleating agent role of CNC. The crystal structure of PEPS remained unchanged in the composites. On the basis of the interfacial energy, the nucleation mechanism of PEPS in the composites was further discussed by taking into consideration the induction of CNC.

Crystallization Behavior of Vetiver Grass Fiber-Polylactic Acid Composite

2011 ◽  
Vol 410 ◽  
pp. 55-58 ◽  
Author(s):  
Somruetai Boonying ◽  
Wimonlak Sutapun ◽  
Nitinat Suppakarn ◽  
Yupaporn Ruksakulpiwat
Keyword(s):  
Crystallization Behavior ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
Fiber Content ◽  
Degree Of Crystallinity ◽  
Poly Lactic Acid ◽  
Vetiver Grass ◽  
Equilibrium Melting Temperature ◽  
Crystallization Degree ◽  
Nucleating Effect

this work, vetiver fiber was used as a filler for poly (lactic acid) (PLA). The thermal properties of neat PLA and vetiver fiber-PLA composites were investigated. Talc as a nucleating agent was used to compare the nucleating effect on crystallization of the composites from vetiver fiber. It was found that crystallization rate was highest in the case of talc-PLA composites. Beside, the crystallization rate of PLA with 20%vetiver fiber content was higher than that of neat PLA and 1-10% (w/w) vetiver fiber-PLA composites. The equilibrium melting temperature (T0m) of neat PLA and PLA composites was obtained from Hoffman-Weeks plot. It was found that the presence of vetiver fiber and talc caused T0m values of PLA decreased compared to that of neat PLA. In addition, T0m values of PLA decreased with increasing vetiver fiber content. For non-isothermal crystallization, degree of crystallinity ( %XC )increased with the presence of vetiver fiber compared to that of neat PLA. As vetiver fiber content increased, %XC increased. Similarly, the incorporation of talc led to an increase in %XC compared to that of neat PLA. PLA with 1%talc content showed the highest %XCcompared to neat PLA and other PLA composites. Moreover, %XC decreased with increasing talc content.

scholarly journals Crystallization Behavior of Polyvinyl Alcohol With Inorganic Nucleating Agent Talc and Regulation Mechanism Analysis

2021 ◽  
Author(s):  
Ruru Huang ◽  
Yane Zhang ◽  
Aimin Xiang ◽  
Songbai Ma ◽  
huafeng tian ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Crystallization Behavior ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
Melt Processing ◽  
Avrami Equation ◽  
Hydroxyl Groups ◽  
Regulation Mechanism ◽  
Mechanism Analysis ◽  
Scanning Calorimetry

Abstract Polyvinyl alcohol (PVA) decompose before melting, making it difficult for melt processing. This phenomenon limits the applications of PVA. Therefore, to widen the application of PVA, in the present work, the PVA films have been prepared by the flow casting method. And talc added as an inorganic nucleating agent to improve the crystallinity of PVA. The effects of talc on the crystallization behavior of PVA are tested by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and successive self-nucleation annealing (SSA). The crystallization kinetics behavior of talc was is further studied by Mo Zhishen equation and Avrami equation. The results show that the addition of talc to the PVA film promotes its crystallization, and as the content of the nucleating agent increases, the crystallinity tends to increase, and the thickness of the wafer becomes uniform due to the increase of nucleation points. These results show that talc regulates the crystallization of PVA, improves the crystallinity and crystallization rate of PVA, and has a heterogeneous nucleation effect. PVA itself exhibits hydrophilicity because it contains large number of hydroxyl groups, and has good physical and chemical properties. In addition, the mechanical properties and water resistance have been further improved by improving the crystallinity of PVA, and the practicability of PVA film in actual production was improved.

Enhanced crystallization rate of biodegradable poly(butylene succinate-co-ethylene succinate) by poly(butylene fumarate) as an efficient polymeric nucleating agent

RSC Advances ◽  
2015 ◽  
Vol 5 (117) ◽  
pp. 96290-96296 ◽  
Author(s):  
Fan Meng ◽  
Zhaobin Qiu
Keyword(s):  
Crystallization Behavior ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
Melt Crystallization ◽  
Butylene Succinate ◽  
Biodegradable Poly

PBF may significantly enhance the nonisothermal melt crystallization behavior of biodegradable PBES by acting as an efficient polymeric nucleating agent.

scholarly journals The Influence of DMDBS on Crystallization Behavior and Crystalline Morphology of Weakly-Phase-Separated Olefin Block Copolymer

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 552
Author(s):  
Yongsheng Zhao ◽  
Cheng Yao ◽  
Tao Chang ◽  
Yanling Zhu
Keyword(s):  
Block Copolymer ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Crystal Size ◽  
Composition Dependence ◽  
Crystallization Process ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
Crystalline Morphology ◽  
Hard Segments

Olefin block copolymer (OBC), with its low hard segments, can form unique space-filling spherulites other than confined-crystallization morphologies, mainly due to its weak phase-separation. In this work, 1,3;2,4-Bis(3,4-dimethylbenzylidene) sorbitol (DMDBS), a well-known nucleating agent, was used to tailor the crystallization behavior and crystalline morphology of OBC. It was found that DMDBS can precipitate within an OBC matrix and self-assemble into crystalline fibrils when cooling from the melt. A non-isothermal crystallization process exhibited an increased crystallization rate and strong composition dependence. During the isothermal crystallization process, DMDBS showed a more obvious nucleating efficiency at a higher crystallization temperature. OBC showed typical spherulites when DMDBS was added. Moreover, a low addition of DMDBS significantly decreased the crystal size, while a large addition of DMDBS induced aggregates, due to the limited miscibility of DMDBS with OBC. The efficient nucleating effect of DMDBS on OBC led to an increased optical transparency for OBC/DMDBS composites.

Effects of Nanoparticles TiN on the Crystallization Behavior of PET Nanocomposites

2011 ◽  
Vol 284-286 ◽  
pp. 353-359 ◽  
Author(s):  
Xiao Hua Gu ◽  
Jia Liang Zhou ◽  
Jian Hong Liu
Keyword(s):  
Crystallization Kinetics ◽  
Crystallization Behavior ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
High Heat ◽  
Avrami Equation ◽  
Kinetic Rate Constant ◽  
Kinetic Rate ◽  
Isothermal Crystallization Kinetics ◽  
Important Significance

In this paper, crystallization kinetics behavior of a high heat-absorbing PET / TiN nanocomposite ,the effect of the crystallization behavior of adding nanoendothermic agent,and their crystallization rate and crystallization were studied by differential scanning calorimeter (DSC) ,researching the effect of crystallization behavior of PET with modified TiN and using Avrami equation to study non-isothermal crystallization kinetics. The results show that the kinetic rate constant Zc increasing with the increase of cooling rate, the crystallization half time t1 / 2 subsequently reduced, the crystal growth become fast; TiN is a good nucleating agent in PET, improve PET’s crystallization rate, adding TiN reduce the crystallization activation energy. This has important significance to guide nanocomposite processing.

Properties and Nonisothermal Crystallization Behavior of Nucleated Polylactide Biodegradable Composite Films

2012 ◽  
Vol 488-489 ◽  
pp. 671-675 ◽  
Author(s):  
Worasak Phetwarotai ◽  
Duangdao Aht-Ong
Keyword(s):  
Tensile Properties ◽  
Cooling Rate ◽  
Crystallization Behavior ◽  
Composite Films ◽  
Crystallization Rate ◽  
Nucleating Agent ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Precipitated Calcium Carbonate ◽  
Biodegradable Composite

Polylactide biodegradable composite films were prepared via melt extrusion using a twin screw extruder. The effects of type and content of nucleating agent and cooling rate on the thermal and tensile properties of these films were investigated. Two types of nucleating agent, talc and nano precipitated calcium carbonate (NPCC), were studied at various contents from 0 to 2.0 phr. Nonisothermal crystallization behavior of composites was characterized by a differential scanning calorimetry (DSC). The cooling rate was varied from 1 to 10°C/min. The results indicated that the presence of nucleating agent significantly influenced on thermal and tensile properties of the PLA composite films. DSC thermograms revealed that the addition of nucleating agent on the PLA films led to an increase of crystallization temperature (Tc), crystallization rate, and degree of crystallization (χc) compared to the neat PLA. These behaviors could be noticed in both the nucleated PLA films with NPCC and talc. In contrast, the Tc and crystallization half-time (t1/2) of these films significantly decreased when the cooling rate increased from 1 to 10°C/min. However, thermal stability of the films decreased when the nucleating agent content increased, especially that of the composites with NPCC.

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