Influence of compatibilizing system on morphology, thermal and mechanical properties of high flow polypropylene reinforced with short hemp fibers

Panaitescu, Denis Mihaela; Vuluga, Zina; Ghiurea, Marius; Iorga, Michaela; Nicolae, Cristian‐Andi; Gabor, Raluca Augusta

doi:10.1016/j.compositesb.2014.10.010

Cited by 61 publications

(54 citation statements)

References 27 publications

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“…Figure 5 shows the results of dynamic mechanical thermal analysis (DMTA). With increasing temperature there is a decrease in storage modulus for all the composites as expected and also observed by ETAATI et al [11], PANAITESCU et al [20] and ROSARIO et al [21]. Independent of the temperature, composite PP + GFPP showed higher storage modulus than all other composites including the ones with coupling agent, Figure 5-a and Figure 5-b, such result was expected due to the reinforcing fiber.…”

Section: Resultssupporting

confidence: 82%

Biocomposites reinforced with natural fibers:thermal, morphological and mechanical characterization

Lemos¹,

Pires

Albuquerque³

et al. 2017

Matéria (Rio J.)

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This study evaluates the thermal, morphological and mechanical behavior of polypropylene (PP) composite with different natural fibers. The fibers used were wood, sugarcane, bamboo, babassu, coconut and kenaf with and without coupling agent. The thermal, morphological and mechanical properties were evaluated, and a composite PP+GFPP (glass fiber) was used as reference. The interaction at the interface fiber-polymer matrix was studied by scanning electron microscopy (SEM) at the fractured surface of the composites, as expected the presence of maleic anhydride (MA) as coupling agent increasedthe interaction at the interface. The influence of natural fiber in the degree of crystallinity of the composites was evaluated by DSC analysis. The samples of PP+GFPP and PP+(PP-MA)+WF (wood flour) showed better temperature stability. PP+GF also presented superior flexural modulus. The thermal dynamic mechanical behavior was evaluated by DMA, a decrease in storage modulus with increasing temperature was observed, the PP+GF and the composite containing maleic anhydride and sugarcane fiber showed higher modulus. The natural fiber biocomposites studied, consistently presented lower flexural modulus and tensile strength than the reference composite, with and without the use of coupling agent. As expected the use of natural fibers lowered the density compared to the reference material.

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Section: Resultssupporting

confidence: 82%

Biocomposites reinforced with natural fibers:thermal, morphological and mechanical characterization

Lemos¹,

Pires

Albuquerque³

et al. 2017

Matéria (Rio J.)

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“…O grau de cristalinidade (χ c ), segundo Panaitescu et al [21] na Equação 2, é descrito como sendo a razão da entalpia de fusão da amostra (ΔH f°) pela entalpia de fusão do polipropileno 100% cristalino (ΔH f°) , onde Wpp é a fração em peso da matriz de polipropileno. O cálculo foi feito, adotando-se o valor de 165 J/g como a entalpia de fusão do PP 100% cristalino (ΔH f°) [22] .…”

Section: Grau De Cristalinidade Dos Compósitos De Ppunclassified

“…Estes compósitos obtiveram uma maior resistência mecânica, o que foi comprovado nos ensaios anteriores por DMTA. Já nas figuras (E) e (F), respectivamente aos PPR/40FC e PPV/40FC, nota-se uma aglomeração das fibras na matriz e espaços sem fibras, formando com isso, cavidades, o que proporciona uma queda na rigidez do material [21] . Isto ocorre, provavelmente, devido à natureza hidrofílica da fibra e hidrofóbica da matriz [5] .…”

Section: Aspectos Da Morfologia Dos Compósitos De Ppunclassified

Propriedades térmicas e mecânicas dos compósitos de Polipropileno pós-consumo reforçados com fibras de celulose

et al. 2017

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ResumoForam investigadas as propriedades térmicas e mecânicas de compósitos de polipropileno reciclado e virgem, reforçados com até 40% em peso de fibras de celulose (FC), bem como a morfologia da matriz polimérica. Para a obtenção dos dados, foram utilizadas as técnicas de Análise Témica Dinâmico-Mecânica (DMTA), Calorimetria Exploratória Diferencial (DSC) e Microscopia Eletrônica de Varredura (MEV). Os resultados mostraram que os compósitos de polipropileno reciclado,com percentagem de 30% FC e os compósitos de polipropileno virgem, com percentagem de 20% FC, tiveram um aumento significativo nos valores de módulo de armazenamento (E') e grau de cristalinidade (χ c ), indicando com isso uma resistência mecânica mais elevada. Já nas amostras com 40% FC, houve uma diminuição na rigidez do material. Estes resultados foram confirmados por MEV, onde observou-se a aglomeração das fibras de celulose na matriz. Não houve alteração nas temperaturas de transição vítrea (T g ) e fusão cristalina (T m ) dos compósitos produzidos. Palavras-chave: compósitos de polipropileno, fibras de celulose, compósitos pós-consumo. AbstractThe thermal and mechanical properties of composite recycled and virgin of polypropylene were investigated, reinforced with up to 40% by weight of cellulose fibers (FC), as well as the morphology of the polymer matrix. To obtain the data, techniques for Dynamic-Mechanical Thermal Analysis (DMTA) were used, Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM). The results showed that recycled polypropylene composites with a percentage of 30% FC and virgin polypropylene composites with a percentage of 20% FC had a significant increase in storage modulus values (E') and degree of crystallinity (χc), indicating a higher mechanical strength in these composites. Since the samples with 40% FC, there was a decrease in the stiffness of the material. These results were confirmed by the SEM, where noted agglomeration of the cellulose fibers in the matrix. There was no change in the glass transition temperature (Tg) and crystalline melting temperature (Tm) of the produced composite.

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“…As the content of MWCNTs increased, the overall crystallinity was slightly decreased. Panaitescu et al [27] treated hemp fibers with MAPP and Silan separately, and the treated fibers functioned as a reinforcing agent in polypropylene matrix. However, the internal crystallinity of products with/without the fibers was detected by XRD and DSC, which was almost unchanged.…”

Section: Studies On Morphological Structures Of Fiber-reinforced Injementioning

confidence: 99%

Properties and Structure of Fiber-Reinforced Injection-Molded Part

Yang

et al. 2016

MATEC Web Conf.

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Abstract.Fiber-reinforced plastics exhibit many merits and injection molding is one of the most common method for the production of plastics. Therefore, injection-molded fiber-reinforced plastic products have been widely used and their properties and structure were studied in the present work. The influences of fiber type, fiber content, and processing on the internal morphological structure of the injection-molded composite materials were investigated. Moreover, the change of performance of plastic products was analyzed.

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Influence of compatibilizing system on morphology, thermal and mechanical properties of high flow polypropylene reinforced with short hemp fibers

Cited by 61 publications

References 27 publications

Biocomposites reinforced with natural fibers:thermal, morphological and mechanical characterization

Biocomposites reinforced with natural fibers:thermal, morphological and mechanical characterization

Propriedades térmicas e mecânicas dos compósitos de Polipropileno pós-consumo reforçados com fibras de celulose

Properties and Structure of Fiber-Reinforced Injection-Molded Part

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