scholarly journals Effect of chemical copolymerization and mixed chain extenders on mechanical properties of HTPB polyurethane

2021 ◽  
Vol 1167 (1) ◽  
pp. 012012
Author(s):  
Yu Zhang ◽  
Jian Zheng ◽  
Xiao Zhang ◽  
Yongqiang Du ◽  
Ke Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chain Extenders

The Effect of Mixed Chain Extender on the Hydrogen Bonding, Thermal and Mechanical Properties of TPUs

2020 ◽  
Vol 1001 ◽  
pp. 16-21
Author(s):  
Ju Jie Sun ◽  
Hai Rui Wang ◽  
Lan Cao ◽  
Tridib K. Sinha
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Hydrogen Bonding ◽  
Thermoplastic Polyurethane ◽  
Chain Extender ◽  
Mixing Ratio ◽  
Thermal And Mechanical Properties ◽  
Elongation At Break ◽  
Chain Extenders ◽  
Hard Block

Chain extender plays a significant role in enhancing the final mechanical properties of thermoplastic polyurethane (TPUs) derived from polytetra methylene etherglycol (PTMG) and 4,4-diphenylmethane diisocyanate (MDI). In this research we focused on the effect that mixed chain extender of ethylene glycol (EG) and 1,4-butanediol (BDO) used has on the phase behavior and morphology of high hard block content TPUs. DSC, FTIR, and mechanical testing were mainly used to characterize the morphology and properties of the TPUs materials. Through this work we were able to show that mixed ratio of different chain extenders had dramatic effects on the properties of the TPUs. After mixing EG and BDO, the degree of hydrogen bonding, melting temperature, tensile strength, tear strength, and hardness of TPUs are all reduced, the glass transition temperature is increased. when the mixing ratio is 1: 1 , the elongation at break is increased to 672% . However, when the mixing ratio is n (EG): n (BDO) = 1: 2, the tensile strength is increased to 29.2 MPa, and the elongation at break is reduced to 353%.

A kind of bonding functional energetic thermoplastic elastomers based on glycidyl azide polymer

2016 ◽  
Vol 48 (8) ◽  
pp. 728-738 ◽  
Author(s):  
Zaijuan Zhang ◽  
Nan Luo ◽  
Jingke Deng ◽  
Zhen Ge ◽  
Yunjun Luo
Keyword(s):  
Mechanical Properties ◽  
Thermoplastic Elastomers ◽  
Work Of Adhesion ◽  
Solid Propellants ◽  
Glycidyl Azide Polymer ◽  
Chain Extenders ◽  
Glycidyl Azide

A kind of bonding functional energetic thermoplastic elastomers (ETPEs) were synthesized as the binder of solid propellants using the mixture of chain extenders including diethyl bis(hydroxymethyl) malonate (DBM). The results showed that the mechanical properties of ETPEs decreased with increasing percent of DBM in the chain extenders. On the contrary, the work of adhesion between solid ingredients hexogen (RDX) and ETPEs increased. In order to test the comprehensive impacts of two elements, the RDX/ETPE propellants were prepared. The results showed when the percent of DBM was 25%, the overall properties of the propellants were optimum.

Microcellular injection molding of recycled poly(ethylene terephthalate) blends with chain extenders and nanoclay

2014 ◽  
Vol 34 (1) ◽  
pp. 5-13 ◽  
Author(s):  
Yottha Srithep ◽  
Lih-Sheng Turng
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Ethylene Terephthalate ◽  
Average Cell Size ◽  
Recycled Pet ◽  
Average Cell ◽  
Poly Ethylene Terephthalate ◽  
Microcellular Injection Molding ◽  
Chain Extenders ◽  
Poly Ethylene

Abstract Poly(ethylene terephthalate) (PET) resin is one of the most widely used thermoplastics, especially in packaging. Due to thermal and hydrolytic degradations, recycled PET (RPET) exhibits poor mechanical properties and lacks moldability. The effects of adding chain extender (CE) and nanoclay to RPET were investigated. Melt blending of RPET with CE was performed in a thermokinetic mixer (K-mixer). The blended materials were then prepared via solid and microcellular injection molding processes. The effects of CE loading levels and the simultaneous addition of nanoclay on the thermal and mechanical properties and cell morphology of the microcellular components were noted. The addition of 1.3% CE enhanced the tensile properties and viscosity of RPET. The higher amount of CE (at 3%) enhanced the viscosity, but the margin of improvement in mechanical properties diminished. While the solid RPET and CE blends were fairly ductile, the samples with nanoclay and all microcellular specimens showed brittle fractural behavior. Finally, nanoclay and the increase of CE content decreased the average cell size and enlarged the cell density of the microcellular samples.

Synergistic effect of phosphorus–nitrogen and silicon-containing chain extenders on the mechanical properties, flame retardancy and thermal degradation behavior of waterborne polyurethane

RSC Advances ◽  
2016 ◽  
Vol 6 (76) ◽  
pp. 72409-72422 ◽  
Author(s):  
Peikun Zhang ◽  
Haojun Fan ◽  
Saiqi Tian ◽  
Yi Chen ◽  
Jun Yan
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Thermal Degradation ◽  
Synergistic Effect ◽  
Flame Retardancy ◽  
Waterborne Polyurethane ◽  
Degradation Behavior ◽  
Thermal Degradation Behavior ◽  
Chain Extenders

A phosphorus–nitrogen–silicon containing waterborne polyurethane (FRWPU) was synthesized in order to improve flame retardancy without sacrificing thermal stability and mechanical properties.

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