Improving Mechanical Properties and Biocompatibilities by Highly Oriented Long Chain Branching Poly(lactic acid) with Bionic Surface Structures

2020 ◽  
Vol 12 (12) ◽  
pp. 14365-14375 ◽  
Author(s):  
Jiafeng Li ◽  
Qian Chen ◽  
Qin Zhang ◽  
Tiantang Fan ◽  
Li Gong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Surface Structures ◽  
Poly Lactic Acid ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Bionic Surface ◽  
Long Chain

scholarly journals Star vs long chain branching of poly(lactic acid) with multifunctional aziridine

2017 ◽  
Vol 61 (4) ◽  
pp. 785-796 ◽  
Author(s):  
Liangliang Gu ◽  
Yuewen Xu ◽  
Grant W. Fahnhorst ◽  
Christopher W. Macosko
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain

scholarly journals Structure and Property of Microinjection Molded Poly(lactic acid) with High Degree of Long Chain Branching

2018 ◽  
Vol 57 (33) ◽  
pp. 11312-11322 ◽  
Author(s):  
Zhong-Guo Zhao ◽  
Qi Yang ◽  
Phil Coates ◽  
Ben Whiteside ◽  
Adrian Kelly ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Structure And Property ◽  
High Degree ◽  
Long Chain

scholarly journals Influence of Different Types of Peroxides on the Long-Chain Branching of PP via Reactive Extrusion

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 886 ◽  
Author(s):  
Sascha Stanic ◽  
Gergö Gottlieb ◽  
Thomas Koch ◽  
Lukas Göpperl ◽  
Klaus Schmid ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Gel Permeation Chromatography ◽  
Reactive Extrusion ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Single Screw Extruder ◽  
Strength Behavior ◽  
Different Temperatures ◽  
Branched Polypropylene ◽  
Long Chain

Long-chain branching (LCB) is known as a suitable method to increase the melt strength behavior of linear polypropylene (PP), which is a fundamental weakness of this material. This enables the modification of various properties of PP, which can then be used—in the case of PP recyclates—as a practical “upcycling” method. In this study, the effect of five different peroxides and their effectiveness in building LCB as well as the obtained mechanical properties were studied. A single screw extruder at different temperatures (180 and 240 °C) was used, and long-chain branched polypropylene (PP-LCB) was prepared via reactive extrusion by directly mixing the peroxides. The peroxides used were dimyristyl peroxydicarbonate (PODIC C126), tert-butylperoxy isopropylcarbonate (BIC), tert-Butylperoxy 2-ethylhexyl carbonate (BEC), tert-amylperoxy 2-ethylhexylcarbonate (AEC), and dilauroyl peroxide (LP), all with a concentration of 20 mmol/kg. The influence of the temperature on the competitive prevalent reactions of degradation and branching was documented via melt mass-flow rate (MFR), rheology measurements, and gel permeation chromatography (GPC). However, via extensional rheology, strain hardening could be observed in all cases and the mechanical properties could be maintained or even improved. Particularly, PODIC C126 and LP signaled a promising possibility for LCB in this study.

Conductivity and mechanical properties of carbon black-reinforced poly(lactic acid) (PLA/CB) composites

2021 ◽  
Author(s):  
Jipeng Guo ◽  
Chi-Hui Tsou ◽  
Yongqi Yu ◽  
Chin-San Wu ◽  
Xuemei Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Carbon Black ◽  
Poly Lactic Acid
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