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The influence of long chain branches of LLDPE on processability and physical properties

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The influence of long chain branches of LLDPE on processability and physical properties

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Título The influence of long chain branches of LLDPE on processability and physical properties
Outro título The influence of long chain branches of linear low density polyethylene on processability and physical properties
Autor Dartora, Paula Cristina
Santana, Ruth Marlene Campomanes
Moreira, Ana Cristina Fontes
Abstract Two polyethylene-based on single-site metallocene catalyst (mLLDPE) were selected to characterize the effect of long chain branching (LCB) on blown film processability, optical and mechanical properties. 13C NMR and parallel plate rheology were used to identify LCB presence on LLDPEs. Blown films were produced from 100% LLDPEs using three different machine direction (MD) stretch ratios. When the same processing conditions for the two LLDPEs grades were used, better processability was observed for LLDPE with LCB. In relation to mechanical and physical properties, Elmendorf tear and optical properties were highly influenced by the presence of LCB. Tear resistance is affected by film orientation and is inversely proportional to the level of LCB in the polymer. It was observed a reduction of 50% in the MD tear strength when comparing with the polymer without LCB. However, haze decreases significantly with the presence of LCB, about 40%.
Contido em Polímeros (São Carlos): ciência e tecnologia. Vol. 25, no. 6 (Nov./Dec. 2015), p. 531-539
Assunto Metalocenos
Polietileno linear de baixa densidade
Propriedades mecanicas
[en] LLDPE
[en] Long chain branching
[en] Mechanical properties
[en] Metallocene
[en] NMR
[en] Rheology
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/147195
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