scholarly journals Improved Mechanical, Thermal, and Hydrophobic Properties of PLA Modified with Alkoxysilanes by Reactive Extrusion Process

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2475
Author(s):  
Elena Torres ◽  
Aide Gaona ◽  
Nadia García-Bosch ◽  
Miguel Muñoz ◽  
Vicent Fombuena ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Reactive Extrusion ◽  
Surface Hydrophobicity ◽  
Extrusion Process ◽  
Mechanical And Thermal Properties ◽  
Water Contact ◽  
Covalent Bonds ◽  
Melting Temperatures ◽  
Free Process ◽  
Reactive Extrusion Process

An eco-friendly strategy for the modification of polylactic acid (PLA) surface properties, using a solvent-free process, is reported. Reactive extrusion (REX) allowed the formation of new covalent bonds between functional molecules and the PLA polymeric matrix, enhancing its mechanical properties and modifying surface hydrophobicity. To this end, the PLA backbone was modified using two alkoxysilanes, phenyltriethoxysilane and N-octyltriethoxysilane. The reactive extrusion process was carried out under mild conditions, using melting temperatures between 150 and 180 °C, 300 rpm as screw speed, and a feeding rate of 3 kg·h−1. To complete the study, flat tapes of neat and functionalized PLA were obtained through monofilament melt extrusion to quantify the enhancement of mechanical properties and hydrophobicity. The results verified that PLA modified with 3 wt% of N-octyltriethoxysilane improves mechanical and thermal properties, reaching Young’s modulus values of 4.8 GPa, and PLA hydrophobic behavior, with values of water contact angle shifting from 68.6° to 82.2°.

A facile route to prepare few-layer graphene/polyamide 6 nanocomposites by liquid reactive extrusion

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 77316-77323 ◽  
Author(s):  
Xubing Fu ◽  
Xingke Zhao ◽  
Dongguang Yan ◽  
Dajiang Zhao ◽  
Jiao Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Reactive Extrusion ◽  
Polyamide 6 ◽  
Extrusion Process ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Reactive Extrusion Process ◽  
Facile Route

A liquid reactive extrusion process was developed to prepare graphene/polyamide 6 nanocomposites and its crystalline and mechanical properties.

scholarly journals Structure and Properties of Reactively Extruded Opaque Post-Consumer Recycled PET

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3531
Author(s):  
María Virginia Candal ◽  
Maryam Safari ◽  
Mercedes Fernández ◽  
Itziar Otaegi ◽  
Agurtzane Múgica ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rheological Properties ◽  
Reactive Extrusion ◽  
Extrusion Process ◽  
Significant Loss ◽  
Chain Extension ◽  
Moderate Increase ◽  
Recycled Pet ◽  
Reactive Extrusion Process ◽  
Long Chain

The recyclability of opaque PET, which contains TiO2 nanoparticles, has not been as well-studied as that of transparent PET. The objective of this work is to recycle post-consumer opaque PET through reactive extrusion with Joncryl. The effect of the reactive extrusion process on the molecular structure and on the thermal/mechanical/rheological properties of recycling post-consumer opaque PET (r-PET) has been analyzed. A 1% w/w Joncryl addition caused a moderate increase in the molecular weight. A moderate increase in chain length could not explain a decrease in the overall crystallization rate. This result is probably due to the presence of branches interrupting the crystallizable sequences in reactive extruded r-PET (REX-r-PET). A rheological investigation performed by SAOS/LAOS/elongational studies detected important structural modifications in REX-r-PET with respect to linear r-PET or a reference virgin PET. REX-r-PET is characterized by a slow relaxation process with enlarged elastic behaviors that are characteristic of a long-chain branched material. The mechanical properties of REX-r-PET increased because of the addition of the chain extender without a significant loss of elongation at the break. The reactive extrusion process is a suitable way to recycle opaque PET into a material with enhanced rheological properties (thanks to the production of a chain extension and long-chain branches) with mechanical properties that are comparable to those of a typical virgin PET sample.

Preparation of Polyesteramides in a Reactive Extrusion Process

2014 ◽  
Vol 299 (11) ◽  
pp. 1343-1351 ◽  
Author(s):  
Manisha Gupta ◽  
Felixine Siegmund ◽  
Edmund Haberstroh ◽  
Martin Rosenthal ◽  
Dimitri A. Ivanov ◽  
...  
Keyword(s):  
Reactive Extrusion ◽  
Extrusion Process ◽  
Reactive Extrusion Process

On-Line Monitoring of Molecular Weight Using NIR Spectroscopy in Reactive Extrusion Process

2013 ◽  
Vol 333 (1) ◽  
pp. 138-141 ◽  
Author(s):  
Björn Bergmann ◽  
Wolfgang Becker ◽  
Jan Diemert ◽  
Peter Elsner
Keyword(s):  
Molecular Weight ◽  
Nir Spectroscopy ◽  
Reactive Extrusion ◽  
Extrusion Process ◽  
On Line ◽  
Reactive Extrusion Process

scholarly journals Structural and Thermo-Mechanical Properties of Poly(ε-caprolactone) Modified by Various Peroxide Initiators

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1101 ◽  
Author(s):  
Przybysz ◽  
Hejna ◽  
Haponiuk ◽  
Formela
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Cross Linking ◽  
Mechanical And Thermal Properties ◽  
Dicumyl Peroxide ◽  
Organic Peroxides ◽  
Reactive Processing ◽  
Scanning Calorimetry ◽  
Melting Temperatures ◽  
Gel Fraction

The modification of poly(ε-caprolactone) (PCL) was successfully conducted during reactive processing in the presence of dicumyl peroxide (DCP) or di-(2-tert-butyl-peroxyisopropyl)-benzene (BIB). The peroxide initiators were applied in the various amounts of 0.5 or 1.0 pbw (part by weight) into the PCL matrix. The effects of the initiator type and its concentration on the structure and mechanical and thermal properties of PCL were investigated. To achieve a detailed and proper explication of this phenomenon, the decomposition and melting temperatures of DCP and BIB initiators were measured by differential scanning calorimetry. The conjecture of the branching or cross-linking of PCL structure via used peroxides was studied by gel fraction content measurement. Modification in the presence of BIB in PCL was found to effectively increase gel fraction. The result showed that the cross-linking of PCL started at a low content of BIB, while PCL modified by high DCP content was only partially cross-linked or branched. PCL branching and cross-linking were found to have a significant impact on the mechanical properties of PCL. However, the effect of used initiators on poly(ε-caprolactone) properties strongly depended on their structure and content. The obtained results indicated that, for the modification towards cross-linking/branching of PCL structure by using organic peroxides, the best mechanical properties were achieved for PCL modified by 0.5 pbw BIB or 1.0 pbw DCP, while the PCL modified by 1.0 pbw BIB possessed poor mechanical properties, as it was related to over cross-linking.

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