Influence of chain extender on thermal properties and melt flow index of stereocomplex PLA

2015 ◽  
Vol 45 ◽  
pp. 52-57 ◽  
Author(s):  
Yodthong Baimark ◽  
Prasong Srihanam
Keyword(s):  
Thermal Properties ◽  
Melt Flow Index ◽  
Chain Extender ◽  
Flow Index ◽  
Melt Flow

scholarly journals Toughening of Poly(L-lactide) with Blends of Poly(ε-caprolactone-co-L-lactide) in the Presence of Chain Extender

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Yaowalak Srisuwan ◽  
Yodthong Baimark ◽  
Supakij Suttiruengwong
Keyword(s):  
Impact Strength ◽  
Melt Flow Index ◽  
Chain Extender ◽  
Chain Extension ◽  
Flow Index ◽  
Melt Blending ◽  
Melt Flow ◽  
Phase Compatibility ◽  
The Impact ◽  
Reactive Melt

A poly(ε-caprolactone-co-L-lactide) copolyester was synthesized and employed to toughen poly(L-lactide) (PLLA) by reactive melt blending in the presence of an epoxy-based chain extender. The effects of chain extension reaction and copolyester content on properties of PLLA-based blends were studied. The chain extension reaction reduced crystallinity and melt flow index of PLLA/copolyester blends. Meanwhile the copolyester blending improved the crystallinities of the chain-extended PLLA up to 20 wt% copolyester. The phase compatibility between PLLA matrix and dispersed copolyester phases was enhanced by the chain extension reaction. The impact strength of chain-extended PLLA increased with the contents of copolyester and chain extender.

Effect of the Technological Additives on the Properties of Recycled Polyolefins

2019 ◽  
Vol 816 ◽  
pp. 90-95 ◽  
Author(s):  
Svetoslav Isaakovich Volfson ◽  
Larisa Yuryevna Zakirova ◽  
Yulia Sergeevna Karaseva ◽  
Alina Ildusovna Nigmatullina
Keyword(s):  
Thermal Properties ◽  
Energy Consumption ◽  
Surface Defects ◽  
Melt Flow Index ◽  
Flow Index ◽  
Shear Stresses ◽  
Technological Properties ◽  
Melt Flow ◽  
Processing Equipment ◽  
Mixing Energy

Recycling of polymers is an important environmental task. However, during the recycling of polymers many technological problems arise because usually not only one polymer, but also mixtures of polymers are recycled. To improve technological properties, such as increasing fluidity, improving processability and quality, reducing the melt pressure in the spinneret head, addressing surface defects caused by viscosity anomaly and excessive shear stresses, preventing the formation of deposits and residue on the forming tool, increasing productivity, reducing the amount gelic, etc., use processing and technological additives. In the research, the effect of technological additives manufactured by Weihai CY Dendrimer Technology Co., Ltd (China) on the technological and thermal properties of recycled polyolefins was studied. It was shown that the technological additives improved the technological properties of recycled polymers: the mixing energy decreased when receiving compositions, the melt flow index values increased, the thermal properties did not deteriorate. The results show the possibility of using of the technological additives in production to increase the productivity of processing equipment and reducing its energy consumption.

scholarly journals Enhancement of mechanical, thermal and water uptake performance of TPU/jute fiber green composites via chemical treatments on fiber surface

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 133-143 ◽  
Author(s):  
Tuffaha Fathe Salem ◽  
Seha Tirkes ◽  
Alinda Oyku Akar ◽  
Umit Tayfun
Keyword(s):  
Water Absorption ◽  
Water Uptake ◽  
Mechanical Test ◽  
Fiber Surface ◽  
Melt Flow Index ◽  
Jute Fiber ◽  
Morphological Properties ◽  
Flow Index ◽  
Melt Flow ◽  
Treatment Type

AbstractChopped jute fiber (JF) surfaces were modified using alkaline, silane and eco-grade epoxy resin. Surface characteristics of jute fibers were confirmed by FTIR and EDX analyses. JF filled polyurethane elastomer (TPU) composites were prepared via extrusion process. The effect of surface modifications of JF on mechanical, thermo-mechanical, melt-flow, water uptake and morphological properties of TPU-based eco-composites were investigated by tensile and hardness tests, dynamic mechanical analysis (DMA), melt flow index (MFI) test, water absorption measurements and scanning electron microscopy (SEM) techniques, respectively. Mechanical test results showed that silane and epoxy treated JF additions led to increase in tensile strength, modulus and hardness of TPU. Glass transition temperature (Tg) of TPU rose up to higher values after JF inclusions regardless of treatment type. Si-JF filled TPU exhibited the lowest water absorption among composites. Surface treated JFs displayed homogeneous dispersion into TPU and their surface were covered by TPU according to SEM micro-photographs.

Rheological Study on of PBT with High Melt Flow Index

2012 ◽  
Vol 487 ◽  
pp. 644-648
Author(s):  
Yuan Liu ◽  
Lin Wang ◽  
Qing Yan Xu ◽  
Pei Jie Lin ◽  
Zhi Hong Guo ◽  
...  
Keyword(s):  
Activation Energy ◽  
Shear Rate ◽  
Apparent Viscosity ◽  
Melt Flow Index ◽  
Flow Index ◽  
Melt Flow ◽  
Flow Activation Energy ◽  
Nonwoven Fabrics ◽  
Flow Activation ◽  
High Flexibility

Melt-blown generated PBT nonwoven fabrics usually have small fibril diameter, high flexibility, well heat and oil resistance. Therefore, they would have promising application such as vehicle filtering media. The rheological behavior of PBT with High Melt Flow Index for Melt-blown is investigated in this paper. It is a direction of the technology design and fabrication parameters .The relation of apparent viscosity and shear rate is analyzed, as well as flow activation energy and Non-Newtonian indexes. The results suggest that PBT with High Melt Flow Index is Non-Newtonian fluid. Apparent viscosity and flow activation energy show gradually decrease with increasing shear rate, exhibiting typical shear-thinning behavior.

From melt flow index to rheogram

1983 ◽  
Vol 22 (1) ◽  
pp. 90-101 ◽  
Author(s):  
A. V. Shenoy ◽  
S. Chattopadhyay ◽  
V. M. Nadkarni
Keyword(s):  
Melt Flow Index ◽  
Flow Index ◽  
Melt Flow

Thermomechanical investigations of PEKK-HAp-CS composites

2019 ◽  
Vol 233 (11) ◽  
pp. 1196-1203
Author(s):  
Rupinder Singh ◽  
Gurchetan Singh ◽  
Jaskaran Singh ◽  
Ranvijay Kumar ◽  
Md Mustafizur Rahman ◽  
...  
Keyword(s):  
Melt Flow Index ◽  
Extrusion Process ◽  
Flow Index ◽  
Fused Deposition Modelling ◽  
Index Test ◽  
Melt Flow ◽  
Scanning Calorimetry ◽  
Fused Deposition ◽  
Ether Ketone ◽  
Input Variables

In this experimental study, a composite of poly-ether-ketone-ketone by reinforcement of hydroxyapatite and chitosan has been prepared for possible applications as orthopaedic scaffolds. Initially, different weight percentages of hydroxyapatite and chitosan were reinforced in the poly-ether-ketone-ketone matrix and tested for melt flow index in order to check the flowability of different compositions/proportions. Suitable compositions revealed by the melt flow index test were then taken forward for the extrusion of filament required for fused deposition modelling. For thermomechanical investigations, Taguchi-based design of experiments has been used with input variables in the extrusion process as follows: temperature, load applied and different composition/proportions. The specimens in the form of feedstock filament produced by the extrusion process were made to undergo tensile testing. The specimens were also inspected by differential scanning calorimetry and photomicrographs. Finally, the specimen showing the best performance from the thermomechanical viewpoint has been selected to extrude the filament for the fused deposition modelling process.

Rheology of poly(vinyl chloride) formulations from melt flow index measurements

1983 ◽  
Vol 5 (4) ◽  
pp. 192-197 ◽  
Author(s):  
A. V. Shenoy ◽  
D. R. Saini ◽  
V. M. Nadkarni
Keyword(s):  
Vinyl Chloride ◽  
Melt Flow Index ◽  
Flow Index ◽  
Melt Flow ◽  
Poly Vinyl Chloride
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