Tensile behaviour of isotactic polypropylene modified by specific nucleation and active fillers

Kotek, Jiřı́; Kelnar, Ivan; Baldrián, Josef; Raab, M.

doi:10.1016/j.eurpolymj.2003.12.004

Cited by 110 publications

(77 citation statements)

References 10 publications

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“…After the quantitative analysis of these correlations an attempt is made to relate the determined parameters to the molecular structure of the polymer. Nucleation is very often used in polypropylene to increase stiffness and strength [23][24][25][26][27][28][29] , to improve productivity by increasing the temperature of crystallization [27][28][29][30] and to modify optical properties [17][18]31 . The efficiency of nucleation is usually estimated by DSC measurements, by changes in the peak temperature of crystallization (T cp ) 32 , which can be related to the thickness of the lamellae formed 33 .…”

Section: Resultsmentioning

confidence: 99%

Effect of the Molecular Structure of the Polymer and Nucleation on the Optical Properties of Polypropylene Homo- and Copolymers

Horváth

Menyhárd

Doshev

et al. 2014

ACS Appl. Mater. Interfaces

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Two soluble nucleating agents were used to modify the optical properties of nine PP homo-and random copolymers. The ethylene content of the polymers changed between 0 and 5.3 wt%.Chain regularity was characterized by the stepwise isothermal segregation technique (SIST), while optical properties by the measurement of the haze of injection molded samples.Crystallization and melting characteristics were determined by differential scanning calorimetry (DSC). The analysis of the results proved that lamella thickness and change in crystallinity influence haze only slightly. A model was introduced which describes quantitatively the dependence of nucleation efficiency and haze on the concentration of the nucleating agent. The model assumes that the same factors influence the peak temperature of crystallization and optical properties. The analysis of the results proved that the assumption is valid under the same crystallization conditions. The parameters of the model depend on the molecular architecture of the polymer. Chain regularity determines supermolecular structure and thus the dependence of optical properties on nucleation.

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Section: Resultsmentioning

confidence: 99%

Effect of the Molecular Structure of the Polymer and Nucleation on the Optical Properties of Polypropylene Homo- and Copolymers

Horváth

Menyhárd

Doshev

et al. 2014

ACS Appl. Mater. Interfaces

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“…That means that the properties of the ester of montanic acid compounds improve the nucleation properties of TiO 2 while amidic wax improves the antinucleation properties. The TiO 2 fillers may act as nucleating or antinucleating agent affecting the crystallization behaviour [19,20,21]. TiO 2 nanoparticles have been described as nucleating agents in the PET crystallization.…”

Section: Avrami Methodsmentioning

confidence: 99%

Effect of different dispersing agents in the non-isothermal kinetics and thermomechanical behavior of PET/TiO₂ composites

Cayuela

Cot

Algaba

et al. 2016

Journal of Macromolecular Science, Part A

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This work is based on the analysis of the influence of dispersing agents on the non-isothermal kinetics, thermomechanical behaviour and dispersing action of PET/TiO 2 nanocomposites. The influence of two montanic waxes and an amide wax used as dispersing agents in the nucleating effect of the nanoparticles is studied. The dispersing agents are the following: a) a partly saponified ester of montanic acids (PSEMA), b) an ester of montanic acids with multifunctional alcohols (MAWMA) and c) an amide wax based on N,N'-Bisstearoyl ethylenediamine (AW). The non-isothermal kinetics based on the Avrami method revealed that MAWMA and PSEMA favours the nucleating effect of the nanoparticles when are included in PET. Birefringence microscopy points out the good dispersing capacity of MAWMA and AW and the termomechanical analysis confirmed that the ester of montanic acids with multifunctional alcohols MAWMA shows the best dispersing properties and best promotes the nucleating effect of the TiO 2 nanoparticles when used for PET/TiO 2 nanocomposites production.

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“…Deformação específica na ruptura (%) Trabalhos anteriores [14,15] revelam que, com a adição de agentes de nucleação, ocorre uma diminuição do tamanho dos esferulitos devido ao aumento do número de núcleos. Este efeito aumenta a cristalinidade ou o tamanho dos esferulitos e por conseqüência aumenta o módulo elástico, pois esferulitos grandes são considerados mais resistentes à deformação.…”

Section: Resistência à Tração (Mpa)unclassified

Efeito da incorporação de talco nas características térmicas, mecânicas e dinâmico-mecânicas de poliuretanos termoplásticos

et al. 2011

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RESUMOO objetivo deste trabalho foi investigar o efeito da adição de talco, um agente nucleante amplamente empregado em formulações de termoplásticos em geral, no comportamento de cristalização e nas propriedades mecânicas de dois poliuretanos termoplásticos (TPUs) de diferentes massas molares. Foram realizadas análises de calorimetria exploratória diferencial (DSC), termogravimetria (TGA), dinâmico-mecânica (DMA), além de ensaios mecânicos. Observou-se que a adição de talco aumentou a temperatura de cristalização e a de decomposição média do TPU de maior massa molar média, no entanto, não foi observada mudança para concentrações superiores a 0,5% (m/m). Análises de DMA indicaram um aumento do módulo de armazenamento com a aditivação somente para o TPU de maior massa molar média. Nos ensaios mecânicos, não foi possível observar alterações significativas nas propriedades. O estudo realizado demonstrou a importância do conhecimento do efeito da adição de talco como agente nucleante em compostos de TPU, visando o melhoramento do desempenho destes materiais. Palavras -chave:Talco, poliuretano termoplástico, agente nucleante, cristalização.The effect of talc addition on the thermal, mechanical and dynamicmechanical characteristics of thermoplastic polyurethanes ABSTRACTThe aim of this work was to investigate the effect of adding talc, a nucleating agent widely used in general purpose thermoplastic formulations, on the crystallization behavior and the mechanical properties of two thermoplastic polyurethanes (TPUs) of different molecular weight. In this study, differential scanning calorimetry (DSC), thermogravimetry (TGA), dynamic-mechanical analysis (DMTA) and mechanical tests were employed. It was observed that the addition of talc increased the crystallization and the decomposition temperature of the highest average molecular weight TPU, although no change was observed at concentrations above 0.5 wt%. DMA analyses showed an increase in storage modulus only for the TPU with the highest average molecular weight. Mechanical testing did not show significant changes in the evaluated properties. The study demonstrated the importance of knowing the particular effects of adding talc as a nucleating agent in TPU compounds, aimed at improving their performance.Keywords: Talc, thermoplastic polyurethane, nucleating agent, crystallization. INTRODUÇÃOA necessidade de se produzir materiais com menor custo e maior disponibilidade no mercado tornou-se um dos grandes desafios para a indústria de componentes para calçados. No setor de laminados, por exemplo, é de grande importância o desenvolvimento de materiais com boas propriedades adesivas que aliem baixa temperatura de processamento e curto tempo de cristalização.O poliéster à base de caprolactona (PES) apresenta custo relativamente elevado e baixa disponibilidade no mercado, sendo prioritariamente utilizado para aplicações mais atraentes economicamente, como na área médica. Por estes motivos, é crescente o interesse em substituir o PES,

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Tensile behaviour of isotactic polypropylene modified by specific nucleation and active fillers

Cited by 110 publications

References 10 publications

Effect of the Molecular Structure of the Polymer and Nucleation on the Optical Properties of Polypropylene Homo- and Copolymers

Effect of the Molecular Structure of the Polymer and Nucleation on the Optical Properties of Polypropylene Homo- and Copolymers

Effect of different dispersing agents in the non-isothermal kinetics and thermomechanical behavior of PET/TiO₂ composites

Efeito da incorporação de talco nas características térmicas, mecânicas e dinâmico-mecânicas de poliuretanos termoplásticos

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Tensile behaviour of isotactic polypropylene modified by specific nucleation and active fillers

Cited by 110 publications

References 10 publications

Effect of the Molecular Structure of the Polymer and Nucleation on the Optical Properties of Polypropylene Homo- and Copolymers

Effect of the Molecular Structure of the Polymer and Nucleation on the Optical Properties of Polypropylene Homo- and Copolymers

Effect of different dispersing agents in the non-isothermal kinetics and thermomechanical behavior of PET/TiO2 composites

Efeito da incorporação de talco nas características térmicas, mecânicas e dinâmico-mecânicas de poliuretanos termoplásticos

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Effect of different dispersing agents in the non-isothermal kinetics and thermomechanical behavior of PET/TiO₂ composites