scholarly journals Microstructural Contributions of Different Polyolefins to the Deformation Mechanisms of Their Binary Blends

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1171 ◽  
Author(s):  
Astrid Van Belle ◽  
Ruben Demets ◽  
Nicolas Mys ◽  
Karen Van Kets ◽  
Jo Dewulf ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Tensile Deformation ◽  
Deformation Mechanisms ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Mechanical Recycling ◽  
Immiscible Polymer Blends ◽  
Binary Blends ◽  
Brittle Behavior ◽  
Clear Cut

The mixing of polymers, even structurally similar polyolefins, inevitably leads to blend systems with a phase-separated morphology. Fundamentally understanding the changes in mechanical properties and occurring deformation mechanisms of these immiscible polymer blends, is important with respect to potential mechanical recycling. This work focuses on the behavior of binary blends of linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), high-density polyethylene (HDPE), and polypropylene (PP) under tensile deformation and their related changes in crystallinity and morphology. All of these polymers plastically deform by shear yielding. When unmixed, the high crystalline polyolefins HDPE and PP both exhibit a progressive necking phenomenon. LDPE initiates a local neck before material failure, while LLDPE is characterized by a uniform deformation as well as clear strain hardening. LLDPE/LDPE and LLDPE/PP combinations both exhibit a clear-cut matrix switchover. Polymer blends LLDPE/LDPE, LDPE/HDPE, and LDPE/PP show transition forms with features of composing materials. Combining PP in an HDPE matrix causes a radical switch to brittle behavior.

Interfacial irregularity induced by hydrogen bonds at the interface in immiscible polymer blends

e-Polymers ◽  
2004 ◽  
Vol 4 (1) ◽  
Author(s):  
Yuka Kobori ◽  
Rei Yasumitsu ◽  
Isamu Akiba ◽  
Saburo Akiyama ◽  
Hironari Sano
Keyword(s):  
Hydrogen Bonds ◽  
Polymer Blends ◽  
Specific Interaction ◽  
The Other ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Immiscible Polymer Blends ◽  
Immiscible Polymer ◽  
Pmma Blends

Abstract Effects of interactions at the interface on the morphologies of immiscible polymer blends were investigated using linear low-density polyethylene/poly(4- vinylphenol) (LLDPE/PVPh) and LLDPE/poly(methyl methacrylate) (LLDPE/PMMA) blends containing polyethylene-block-PMMA (PE-b-PMMA). In the case of LLDPE/ PMMA/PE-b-PMMA blends, in which there is no specific interaction at the interface, shapes of dispersed droplets were maintained and sizes were simply diminished with increasing PE-b-PMMA content. On the other hand, in the case of LLDPE/ PVPh/PE-b-PMMA, in which hydrogen bonds are formed between PVPh and PMMA blocks at the interface, we found irregularly undulated phase boundaries.

scholarly journals Macromolecular Insights into the Altered Mechanical Deformation Mechanisms of Non-Polyolefin Contaminated Polyolefins

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 239
Author(s):  
Ruben Demets ◽  
Marie Grodent ◽  
Karen Van Van Kets ◽  
Steven De De Meester ◽  
Kim Ragaert
Keyword(s):  
Interfacial Adhesion ◽  
Tensile Deformation ◽  
Linear Structure ◽  
Polyamide 6 ◽  
Deformation Mechanisms ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Pure Material ◽  
Polymer Type

Current recycling technologies rarely achieve 100% pure plastic fractions from a single polymer type. Often, sorted bales marked as containing a single polymer type in fact contain small amounts of other polymers as contaminants. Inevitably, this will affect the properties of the recycled plastic. This work focuses on understanding the changes in tensile deformation mechanism and the related mechanical properties of the four dominant types of polyolefin (PO) (linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), high-density polyethylene (HDPE), and polypropylene (PP)), contaminated with three different non-polyolefin (NPO) polymers (polyamide-6 (PA-6), polyethylene terephthalate (PET), and polystyrene (PS)). Under the locally elevated stress state induced by the NPO phase, the weak interfacial adhesion typically provokes decohesion. The resulting microvoids, in turn, initiate shear yielding of the PO matrix. LLDPE, due to the linear structure and intercrystalline links, is well able to maintain high ductility when contaminated. LDPE shows deformation similar to the pure material, but with decreasing ductility as the amount of NPO increases. Addition of 20 wt% PA-6, PET, and PS causes a drop in strain at break of 79%, 63%, and 84%, respectively. The typical ductile necking of the high-crystalline HDPE and PP is strongly disturbed by the NPO phase, with a transition even to full brittle failure at high NPO concentration.

The Temperature Dependence of the Interphase Characteristics of Carbon-Black-Filled Polymer Blends of SKD-35 cis-Butadiene Rubber and Low-Density Polyethylene

2014 ◽  
Vol 41 (10) ◽  
pp. 55-58
Author(s):  
L.V. Baragunova ◽  
T.A. Gubzhev ◽  
A.Z. Kashezhev ◽  
R.B. Tkhakakhov ◽  
B.S. Karamurzov
Keyword(s):  
Carbon Black ◽  
Polymer Blends ◽  
Temperature Dependence ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Butadiene Rubber ◽  
Large Drop ◽  
Drop Method ◽  
Interphase Tension ◽  
Large Drop Method

The large drop method was used to investigate the interphase tension of polymer blends of synthetic SKD-35 -butadiene rubber and low-density polyethylene filled with nanosized carbon black DG-100 particles at the boundary with glycerin and air in the temperature range 20–120°C.

Miscibility in crystalline polymer blends: Isotactic polypropylene and linear low-density polyethylene

2003 ◽  
Vol 90 (12) ◽  
pp. 3338-3346 ◽  
Author(s):  
Giuliana Gorrasi ◽  
Rachele Pucciariello ◽  
Vincenzo Villani ◽  
Vittoria Vittoria ◽  
Sandra Belviso
Keyword(s):  
Polymer Blends ◽  
Isotactic Polypropylene ◽  
Crystalline Polymer ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene
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