High melt strength, tear resistant blown film based on poly(lactic acid)

2015 ◽  
Author(s):  
Neil R. Edmonds ◽  
Peter N. Plimmer ◽  
Chris Tanner
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Melt Strength ◽  
Blown Film

Blown film extrusion of poly(lactic acid) without melt strength enhancers

2017 ◽  
Vol 134 (34) ◽  
pp. 45212 ◽  
Author(s):  
Sonal S. Karkhanis ◽  
Nicole M. Stark ◽  
Ronald C. Sabo ◽  
Laurent M. Matuana
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Melt Strength ◽  
Film Extrusion ◽  
Blown Film ◽  
Blown Film Extrusion

scholarly journals Star Shaped Long Chain Branched Poly (lactic acid) Prepared by Melt Transesterification with Trimethylolpropane Triacrylate and Nano-ZnO

Polymers ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 796 ◽  
Author(s):  
Le Yang ◽  
Zaijun Yang ◽  
Feng Zhang ◽  
Lijin Xie ◽  
Zhu Luo ◽  
...  
Keyword(s):  
Lactic Acid ◽  
High Efficiency ◽  
Synergistic Effects ◽  
Transesterification Reaction ◽  
Poly Lactic Acid ◽  
Cell Diameter ◽  
Nano Zno ◽  
Melt Strength ◽  
Trimethylolpropane Triacrylate ◽  
Long Chain

Long chain branched poly (lactic acid) (LCBPLA) was prepared via transesterification between high molecular weight poly (lactic acid) (PLA) and low molar mass monomer trimethylolpropane triacrylate (TMPTA) during melt blending in the presence of zinc oxide nanoparticles (nano-ZnO) as a transesterification accelerant in a torque rheometer. Compared with the traditional processing methods, this novel way is high-efficiency, environmentally friendly, and gel-free. The results revealed that chain restructuring reactions occurred and TMPTA was grafted onto the PLA backbone. The topological structures of LCBPLA were verified and investigated in detail. It was found that the concentration of the accelerants and the sampling occasion had very important roles in the occurrence of branching structures. When the nano-ZnO dosage was 0.4 phr and PLA was sampled at the time corresponding to the reaction peak in the torque curve, PLA exhibited a star-shaped topological structure with a high branching degree which could obviously affect the melt strength, extrusion foaming performances, and crystallization behaviors. Compared with pristine PLA, LCBPLA showed a higher melt strength, smaller cell diameter, and slower crystallization speed owing to the synergistic effects of nano-ZnO and the long chain branches introduced by the transesterification reaction in the system. However, severe degradation of the LCBPLAs would take place under a mixing time that was too long and lots of short linear chains generated due to the excessive transesterification reaction, with a sharp decline in melt strength.

scholarly journals Poly(lactic acid) (PLA) Based Tear Resistant and Biodegradable Flexible Films by Blown Film Extrusion

Materials ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 148 ◽  
Author(s):  
Norma Mallegni ◽  
Thanh Phuong ◽  
Maria-Beatrice Coltelli ◽  
Patrizia Cinelli ◽  
Andrea Lazzeri
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Film Extrusion ◽  
Flexible Films ◽  
Blown Film ◽  
Blown Film Extrusion

scholarly journals Flat Die Extruded Biocompatible Poly(Lactic Acid) (PLA)/Poly(Butylene Succinate) (PBS) Based Films

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1857 ◽  
Author(s):  
Vito Gigante ◽  
Maria-Beatrice Coltelli ◽  
Alessandro Vannozzi ◽  
Luca Panariello ◽  
Alessandra Fusco ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Butylene Succinate ◽  
Elongation At Break ◽  
Melt Strength ◽  
In Vitro Biocompatibility ◽  
Extruded Films ◽  
Acrylic Copolymers ◽  
Sanitary Products

Biodegradable polymers are promising materials for films and sheets used in many widely diffused applications like packaging, personal care products and sanitary products, where the synergy of high biocompatibility and reduced environmental impact can be particularly significant. Plasticized poly(lactic acid) (PLA)/poly(butylene succinate) (PBS) blend-based films, showing high cytocompatibility and improved flexibility than pure PLA, were prepared by laboratory extrusion and their processability was controlled by the use of a few percent of a commercial melt strength enhancer, based on acrylic copolymers and micro-calcium carbonate. The melt strength enhancer was also found effective in reducing the crystallinity of the films. The process was upscaled by producing flat die extruded films in which elongation at break and tear resistance were improved than pure PLA. The in vitro biocompatibility, investigated through the contact of flat die extruded films with cells, namely, keratinocytes and mesenchymal stromal cells, resulted improved with respect to low density polyethylene (LDPE). Moreover, the PLA-based materials were able to affect immunomodulatory behavior of cells and showed a slight indirect anti-microbial effect. These properties could be exploited in several applications, where the contact with skin and body is relevant.

Foaming behavior of microcellular poly(lactic acid)/TPU composites in supercritical CO2

2017 ◽  
Vol 31 (1) ◽  
pp. 61-78 ◽  
Author(s):  
Daifang Xu ◽  
Kejing Yu ◽  
Kun Qian ◽  
Chul B Park
Keyword(s):  
Lactic Acid ◽  
Cell Structure ◽  
Thermoplastic Polyurethane ◽  
Optical Microscope ◽  
Expansion Ratio ◽  
Poly Lactic Acid ◽  
Free Energy Barrier ◽  
Scanning Calorimetry ◽  
Melt Strength ◽  
Cell Nucleation

This article presents the effects of thermoplastic polyurethane (TPU) on the crystallization and melt strength of poly(lactic acid) (PLA) and on the enhancement of cell nucleation and expansion ratio to manufacture microcellular thermoplastic PLA foams in supercritical carbon dioxide. Addition of TPU increased the crystallinity and decreased the crystallite size as observed by differential scanning calorimetry and polarized optical microscope. The formed crystal domains worked as cross-linking points to increase the melt strength of a polymer that potentially affected the cell growth. Scanning electron microscope confirmed the immiscibility between PLA and TPU, and TPU was dispersed as islands in the PLA matrix. This phase morphology further influenced the cell structure of the PLA/TPU foams. TPU acted as a nucleating agent to enhance heterogeneous cell nucleation that is caused by the decrease in free energy barrier. Tensile stress that generated around the TPU and in some local regions surrounding the crystals and crystallization was dominant to induce cell nucleation.

scholarly journals Plasticization Effect of Poly(Lactic Acid) in the Poly(Butylene Adipate–co–Terephthalate) Blown Film for Tear Resistance Improvement

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1904 ◽  
Author(s):  
Do Young Kim ◽  
Jae Bin Lee ◽  
Dong Yun Lee ◽  
Kwan Ho Seo
Keyword(s):  
Lactic Acid ◽  
Adipic Acid ◽  
Acid Ester ◽  
Extrusion Process ◽  
Poly Lactic Acid ◽  
Product Packaging ◽  
Film Extrusion ◽  
Blown Film ◽  
Blown Film Extrusion ◽  
Tear Resistance

The mechanical properties and tear resistance of an ecofriendly flexible packaging film, i.e., poly(lactic acid) (PLA)/poly (butylene adipate–co–terephthalate) (PBAT) film, were investigated via a blown film extrusion process. The application of PLA and PBAT in product packaging is limited due to the high brittleness, low stiffness, and incompatibility of the materials. In this study, the effects of various plasticizers, such as adipate, adipic acid, glycerol ester, and adipic acid ester, on the plasticization of PLA and fabrication of the PLA/PBAT blown film were comprehensively evaluated. It was determined that the plasticizer containing ether and ester functionalities (i.e., adipic acid ester) improved the flexibility of PLA as well as its compatibility with PBAT. It was found that the addition of the plasticizer effectively promoted chain mobility of the PLA matrix. Moreover, the interfacial adhesion between the plasticized PLA domain and PBAT matrix was enhanced. The results of the present study demonstrated that the plasticized PLA/PBAT blown film prepared utilizing a blown film extrusion process exhibited improved tear resistance, which increased from 4.63 to 8.67 N/mm in machine direction and from 13.19 to 16.16 N/mm in the transverse direction.

scholarly journals Mechanical and Optical Properies of Poly Lactic Acid Modified Linear- Low Density Polyethylene / Low Density Polyethylene (Lldpe/Ldpe) Blend Blown Film

2012 ◽  
pp. 122-125
Author(s):  
Omveer Singh ◽  
Pradeep Upadhyaya ◽  
T.k Mishra ◽  
Navin Chand
Keyword(s):  
Lactic Acid ◽  
Polylactic Acid ◽  
Low Density Polyethylene ◽  
Poly Lactic Acid ◽  
Low Density ◽  
Melt Blending ◽  
Linear Low Density Polyethylene ◽  
Blown Film ◽  
Twin Screw ◽  
Poly Ethylene

Poly lactic acid (PLA) is well known aliphatic poly-esters derived from corn and sugar beets, and degrades into nontoxic compounds in landfill. Melt blending of poly lactic acid and linear low density polyethylene (LLDPE) was performed in an effort to toughen polylactic acid. Melt blending of linear low density polyethylene (LLDPE) and polylactic Acid (PLA) and Low density poly ethylene (LDPE) were performed in a twin screw extruder with post extrusion blown film. The blend compositions were optimized by mechanical properties. On the basis of this, LLDPE 80 wt % LDPE 20 wt% and 1-4 wt% poly lactic acid (PLA) were found to be an optimum composition. The blends were characterized according to their mechanical and optical behavior. This blend may be used for packaging application.

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