Preparation of polypropylene with high melt strength by wet reaction blending of lignin

2021 ◽  
pp. 51224
Author(s):  
Bo Tian ◽  
Jinfeng Li ◽  
Zhigang Li ◽  
Wei Dong ◽  
Nan Zhang ◽  
...  
Keyword(s):  
Melt Strength

Mechanisms of ductile tear in blown film from blends of polyethylene and high melt strength polypropylene

Polymer ◽  
2002 ◽  
Vol 43 (24) ◽  
pp. 6515-6526 ◽  
Author(s):  
A.C Chang ◽  
S.P Chum ◽  
A Hiltner ◽  
E Baer
Keyword(s):  
Melt Strength ◽  
Blown Film ◽  
High Melt Strength Polypropylene

One-Pot Synthesis of High-Melt-Strength Isotactic Polypropylene Ionomers

2021 ◽  
Author(s):  
Carlos R. López-Barrón ◽  
Nikola S. Lambic ◽  
Joseph A. Throckmorton ◽  
Jonathan J. Schaefer ◽  
Avery Smith ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
One Pot ◽  
Melt Strength ◽  
One Pot Synthesis

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.

Preparation and properties of high melt strength PBS and its environmentally friendly foaming materials

2021 ◽  
pp. 026248932110536
Author(s):  
Xiao-Ming Zhou ◽  
Yi-Fan Liu
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Polymer Melt ◽  
Environmentally Friendly ◽  
Cross Linking ◽  
Graft Material ◽  
Butylene Succinate ◽  
Foaming Agent ◽  
Melt Strength ◽  
Blending Method

In order to improve the melt strength of Poly(butylene succinate) (PBS) resin, the silane graft-crosslinked PBS copolyester materials were prepared by melt blending method with vinyltriethyl silane as graft material and benzyl peroxide (BPO) as initiator. At the same time, the environmentally friendly compound foaming agent (citric acid and sodium bicarbonate) was used as foaming agent. The results showed that the tensile properties and melt strength of PBS resin were greatly improved after silane grafting and cross-linking, and the graft and cross-linking reaction between PBS resin and silane occurred, forming a three-dimensional space network structure, and the viscosity and elasticity of polymer melt was changed, which increased the entropy elasticity of the material and strengthened the polymer melt strength. The additional amount of compound foaming agent and the cross-linking degree of material had important influence on the diameter and distribution of PBS foaming material.

Development of high melt strength polypropylene and its application in thermoplastic elastomeric composition

2021 ◽  
pp. 009524432110510
Author(s):  
Mousumi De Sarkar ◽  
Nishant Chandel ◽  
Shib Shankar Banerjee ◽  
Subhabrata Saha ◽  
Anil K Bhowmick ◽  
...  
Keyword(s):  
Fixed Ratio ◽  
Reactive Extrusion ◽  
Extrusion Process ◽  
Structure Property ◽  
Chain Branching ◽  
Melt Strength ◽  
Long Chain Branching ◽  
Zinc Diethyldithiocarbamate ◽  
Long Chain ◽  
High Melt Strength Polypropylene

High melt strength polypropylene (HMS-PP) with a long-chain branched structure is a modified form of polypropylene (PP) which has basic properties of regular PP but with superior melt drawability. This paper reports on the development of gel-free HMS-PP from a linear isotactic PP through the introduction of long-chain branching on its backbone via a reactive extrusion process, using dicetyl-peroxydicarbonate (PODIC) alone or in combination with a coagent. The melt strength and the mechanical properties such as impact and flexural strength of PP showed improvements with the modification with PODIC. 5000 ppm by weight of PODIC was found to provide the best balance of properties. The efficacies of zinc diethyldithiocarbamate (ZDC) and tetramethyl thiuram disulphide (TMTD) as coagents in combination with PODIC to augment properties of HMS-PP further were explored. TMTD offered slightly enhanced performance benefits as compared to ZDC at an optimized concentration of 100 ppm by weight. The application potential of HMS-PP in thermoplastic elastomeric blends of HMS-PP with ethylene-propylene-diene monomer (EPDM) rubber at a fixed ratio of 35/65 by weight was also investigated. Structure-property correlations were established between the extent of long-chain branching in the modified PP and the properties of the resultant thermoplastic elastomeric composition.

Polyamide 6 and polyamide 66 blends with functionalized polyolefins: Effect of phenomenal increase in viscosity and melt strength of polyamide 66‐based materials

2020 ◽  
Vol 60 (12) ◽  
pp. 3095-3114
Author(s):  
Yuri Krivoguz ◽  
Stepan Pesetskii ◽  
Olga Makarenko
Keyword(s):  
Polyamide 6 ◽  
Polyamide 66 ◽  
Melt Strength

Melt Strength and Extensibility of High-Density Polyethylene

1984 ◽  
pp. 229-236
Author(s):  
F. P. La Mantia ◽  
D. Acierno
Keyword(s):  
High Density Polyethylene ◽  
High Density ◽  
Melt Strength

Highly-Toughened Polylactide- (PLA-) Based Ternary Blends with Significantly Enhanced Glass Transition and Melt Strength: Tailoring the Interfacial Interactions, Phase Morphology, and Performance

2018 ◽  
Vol 51 (11) ◽  
pp. 4298-4314 ◽  
Author(s):  
Majid Mehrabi Mazidi ◽  
Arman Edalat ◽  
Reyhaneh Berahman ◽  
Fatemeh Sadat Hosseini
Keyword(s):  
Glass Transition ◽  
Phase Morphology ◽  
Ternary Blends ◽  
Interfacial Interactions ◽  
Melt Strength ◽  
And Performance

Production of high melt strength polypropylene by gamma irradiation

2007 ◽  
Vol 76 (11-12) ◽  
pp. 1691-1695 ◽  
Author(s):  
A.B. Lugão ◽  
B.W.H. Artel ◽  
A. Yoshiga ◽  
L.F.C.P. Lima ◽  
D.F. Parra ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Melt Strength ◽  
High Melt Strength Polypropylene
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