Reactive extrusion process for the grafting of maleic anhydride onto linear low-density polyethylene with ultraviolet radiation

Due to their appealing properties such as high-temperature dimensional stability, chemical resistance, compressive strength and recyclability, new-generation foams based on engineering thermoplastics such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) have been gaining significant attention. Achieving low-density foams without sacrificing the mechanical properties is of vital importance for applications in the field of transportation and construction, where sufficient compressive strength is desired. In contrast to numerous research studies on PET foams, only a limited number of studies on PBT foams and in particular, on extruded PBT foams are known. Here we present a novel route to extruded PBT foams with densities as low as 80 kg/m3 and simultaneously with improved compressive properties manufactured by a tandem reactive-extrusion process. Improved rheological properties and therefore process stability were achieved using two selected 1,3,5-benzene-trisamides (BTA1 and BTA2), which are able to form supramolecular nanofibers in the PBT melt upon cooling. With only 0.08 wt % of BTA1 and 0.02 wt % of BTA2 the normalized compressive strength was increased by 28% and 15%, respectively. This improvement is assigned to the intrinsic reinforcing effect of BTA fibers in the cell walls and struts.

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Environmental weathering of (linear low-density polyethylene)/(soya powder) blends compatibilized with polyethylene-grafted maleic anhydride

Journal of Vinyl and Additive Technology ◽

10.1002/vnl.20292 ◽

2012 ◽

Vol 18 (1) ◽

pp. 57-64 ◽

Cited By ~ 11

Author(s):

Sam Sung Ting ◽

Hanafi Ismail ◽

Zulkifli Ahmad

Keyword(s):

Maleic Anhydride ◽

Low Density Polyethylene ◽

Low Density ◽

Linear Low Density Polyethylene ◽

Powder Blends

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Quantitative analysis of the polymeric blends

Progress in Rubber Plastics and Recycling Technology ◽

10.1177/1477760618797541 ◽

2018 ◽

Vol 35 (2) ◽

pp. 75-89 ◽

Cited By ~ 2

Author(s):

Maciej Kisiel ◽

Beata Mossety-Leszczak ◽

Agnieszka Frańczak ◽

Dominik Szczęch

Keyword(s):

Differential Scanning Calorimetry ◽

Quantitative Analysis ◽

Linear Correlation ◽

Extrusion Process ◽

Low Density Polyethylene ◽

Low Density ◽

Linear Low Density Polyethylene ◽

Scanning Calorimetry ◽

Polyethylene Blends ◽

Polymeric Blends

A method of quantitative analysis of polypropylene/linear low density polyethylene blends was determined by using differential scanning calorimetry. The samples were prepared by means of extrusion process. The method of quantitative analysis was based on the principle that the melting enthalpies of the components in the mixture are proportional to their amount, but it has been found that the presence of two polymers in the blend has influence on the crystallization of its components. Previous studies seemed to neglect this phenomenon, so a linear correlation allowing to eliminate discrepancies between calculated and actual quantitative blend composition has been developed. This approach was proven to be more accurate than earlier directly proportional enthalpy—quantity dependence.

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