Rheological, mechanical, thermal, and morphological properties of polypropylene/ethylene-octene copolymer blends

Silva, Ana Lúcia Nazareth da; Rocha, Marisa Cristina Guimarães; Coutinho, Fernanda M. B.; Bretas, Rosário Elida Suman; Scuracchio, Carlos Henrique

doi:10.1002/(sici)1097-4628(20000131)75:5<692::aid-app12>3.0.co;2-y

Cited by 111 publications

(60 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Babu and coworkers [18,19] explored a new TPV based on polypropylene (PP) and ethylene octene copolymer (EOC) blend system. EOC has gained special attention because of its unique molecular structure and also it provides better toughening characteristics than EPDM rubber [20,21]. Recently Giri et al [22] developed a new system in this family which is based on LLDPE/ PDMS blend system.…”

Section: G Heinrichmentioning

confidence: 99%

Novel thermoplastic vulcanizates (TPVs) based on silicone rubber and polyamide exploring peroxide cross-linking

Chatterjee¹,

Wießner²,

Naskar³

et al. 2014

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. Novel thermoplastic vulcanizates (TPVs) based on silicone rubber (PDMS) and polyamide (PA12) have been prepared by dynamic vulcanization process. The effect of dynamic vulcanization and influence of various types of peroxides as cross-linking agents were studied in detail. All the TPVs were prepared at a ratio of 50/50 wt% of silicone rubber and polyamide. Three structurally different peroxides, namely dicumyl peroxide (DCP), 3,3,5,7,7-pentamethyl 1,2,4-trioxepane (PMTO) and cumyl hydroperoxide (CHP) were taken for investigation. Though DCP was the best option for curing the silicone rubber, at high temperature it suffers from scorch safety. An inhibitor 2,2,6,6-tetramethylpiperidinyloxyl (TEMPO) was added with DCP to stabilize the radicals in order to increase the scorch time. Though CHP (hydroperoxide) had higher half life time than DCP at higher temperature, it has no significant effect on cross-linking of silicone rubber. PMTO showed prolonged scorch safety and better cross-linking efficiency rather than the other two. TPVs of DCP and PMTO were made up to 11 minutes of mixing. Increased values of tensile strength and elongation at break of PMTO cross-linked TPV indicate the superiority of PMTO. Scanning electron micrographs correlate with mechanical properties of the TPVs. High storage modulus (E!) and lower loss tangent value of the PMTO cross-linked TPV indicate the higher degree of cross-linking which is also well supported by the overall cross-link density value. Thus PMTO was found to be the superior peroxide for cross-linking of silicone rubber at high temperature.

show abstract

Section: G Heinrichmentioning

confidence: 99%

Novel thermoplastic vulcanizates (TPVs) based on silicone rubber and polyamide exploring peroxide cross-linking

Chatterjee¹,

Wießner²,

Naskar³

et al. 2014

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

“…A adição de PEUBD aos polietilenos e ao PP melhora a resistência ao impacto, a flexibilidade e a resistência ao rasgamento desses polímeros [41][42][43][44] .…”

Section: Aplicaçõesunclassified

Polietileno: principais tipos, propriedades e aplicações

2003

Self Cite

View full text Add to dashboard Cite

Resumo: A estrutura de cada polímero tem influência direta sobre a sua densidade e suas propriedades mecâ-nicas. Ramificações longas, como as presentes no polietileno de baixa densidade, por exemplo, aumentam a resistência ao impacto, diminuem a densidade e facilitam o processamento, enquanto que as ramificações curtas, presentes no polietileno linear de baixa densidade, aumentam a cristalinidade e a resistência à tração em relação ao polietileno de baixa densidade (obtido via radicais livres). As principais aplicações, assim como o tipo de processamento usado para cada tipo de polietileno, são apresentadas neste trabalho. Por último, é feita uma comparação entre catalisadores Ziegler-Natta e catalisadores metalocênicos. O polietileno produzido por catalisador metalocênico apresenta uma estreita distribuição de peso molecular e uma distribuição mais uniforme de comonômeros incorporados às cadeias poliméricas do que o polietileno produzido por catalisadores Ziegler-Natta. Essas características propiciam uma melhora na resistência à tração do produto final. Palavras-chave: Polietilenos, propriedades, aplicações, iniciação via radicais livres, catalisadores ZieglerNatta, catalisadores metalocênicos. Polyethylene: Main Types, Properties and ApplicationsAbstract: The structure of each polymer has a direct influence on its density and mechanical properties. Longchain branches, such as those present in low density polyethylene, for example, increase its impact strength, decrease density and improve processing. Short-chain branches present in linear low density polyethylene, on the other hand, increase crystallinity and tensile strength in comparison to low density polyethylene (produced by free radical initiators). The main applications and the type of processing used for each type of polyethylene are also presented in this work. A comparison between Ziegler-Natta and metallocene catalysts is carried out. The polyethylene produced by metallocene catalysts presents narrow molecular weight distribution and a uniform distribution of comonomer incorporated into the polymer chain. Those characteristics provide an enhancement on the tensile properties and impact strength of final products. Keywords: Polyethylenes, properties, applications, free radical initiation, Ziegler-Natta catalysts, matallocene catalysts.Autor para correspondência: Fernanda M.B. Coutinho, Instituto de Química, Universidade do Estado do Rio de Janeiro -Rua São Francisco Xavier n° 524, Maracanã, CEP: 20559-900, Rio de Janeiro, RJ. E-mail: fern@uerj.br para cada 5 a 15nm, embora haja defeitos que são pouco freqüentes [1] . Os polietilenos são inertes face à maioria dos produtos químicos comuns, devido à sua natureza parafínica, seu alto peso molecular e sua estrutura parcialmente cristalina. Em temperaturas abaixo de 60 °C, são parcialmente solúveis em todos os solventes. Entretanto, dois fenômenos podem ser observados [2] :

show abstract

“…Recently, new families of ethylene-alpha olefin copolymers have gained significant attention due to their unique molecular architecture with narrow molecular weight distribution, uniform co-monomer distribution and long chain branching along the polymer backbone [6]. Ethylene octene copolymer (EOC) in particular has been shown to provide better toughening characteristics to PP, when compared with the conventionally used EPDM rubber [7,8].…”

Section: Introductionmentioning

confidence: 99%

Interrelationships of morphology, thermal and mechanical properties in uncrosslinked and dynamically crosslinked PP/EOC and PP/EPDM blends

Babu¹,

Singha²,

Naskar³

2010

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. Thermoplastic vulcanizates (TPVs) based on polypropylene (PP) with ethylene octene copolymer (EOC) and ethylene propylene diene rubber (EPDM) have been developed by coagent assisted dicumyl peroxide crosslinking system. The study was pursued to explore the influence of two dissimilar polyolefin polymers (EOC and EPDM) having different molecular architectures on the state and mode of dispersion of the blend components and their effects with special reference to morphological, thermal and mechanical characteristics. The effects of dynamic crosslinking of the PP/EOC and PP/EPDM have been compared by varying the concentration of crosslinking agent and ratio of blend components. The results suggested that the uncrosslinked and dynamically crosslinked blends of PP/EOC exhibit superior mechanical properties over PP/EPDM blends. From the hystersis experiments it was found that PP/EOC blends also perform better fatigue properties over PP/EPDM based blends. It was demonstrated that, the origin of the improved mechanical properties of EOC based blends is due to the combined effect of the unique molecular architecture with the presence of smaller crystals and better interfacial interaction of EOC phase with PP as supported by the results of thermal and fatigue analyses.

show abstract

Rheological, mechanical, thermal, and morphological properties of polypropylene/ethylene-octene copolymer blends

Cited by 111 publications

References 17 publications

Novel thermoplastic vulcanizates (TPVs) based on silicone rubber and polyamide exploring peroxide cross-linking

Novel thermoplastic vulcanizates (TPVs) based on silicone rubber and polyamide exploring peroxide cross-linking

Polietileno: principais tipos, propriedades e aplicações

Interrelationships of morphology, thermal and mechanical properties in uncrosslinked and dynamically crosslinked PP/EOC and PP/EPDM blends

Contact Info

Product

Resources

About