News Details
Chain extender on the properties of HTPB/IPDI propellant is studied
2017-2-24 23:21:29
Chain extender on the properties of HTPB/IPDI propellant is studied, keep it real solidification parameters! T!!! , HTPB and chain extender under the constant active hydrogen mole ratio "(! T! = 0.85," = 4), investigate different chain extender on the mechanical properties of propellant. MOCA is 3, 3 - dichloro - 4-2 amino diphenyl methane.
Add glycol chain extender, maximum elongation of propellant at room temperature, high temperature slightly higher than the blank formula; Propylene glycol, butyl glycol can improve the tensile strength of propellant at room temperature; And glutaric alcohol and glycol decreased tensile strength. For propylene glycol, when! T!!! = 0.85/4, propellant tensile strength increased by 51.7%, the largest elongation increased by 5.6%.
To join both alcohol chain extender can improve the low temperature of HTPB/IP - DI propellant dehumidifying phenomenon, especially the great increase in the cryogenic propellant maximum elongation. From propylene glycol, butyl glycol, butyl glycol to glycol, HTPB/IPDI propellant is studied under low temperature tensile strength increased by 34.7%, 39.8%, 24.4% and 39.8% respectively; The largest elongation increased by 59.8%, 75.4%, 76.1% and 75.4% respectively.
Besides 2 ethyl toluene diamine, other types of diamine extender chain agent can improve the strength of the propellant and the propellant under normal temperature, high temperature and low temperature elongation slash, urea and MOCA can significantly improve the strength of the propellant.
Including two hydroxyl ether, like a shrink diethylene glycol can improve the propellant at the same time, the tensile strength and elongation of the ether containing two amino but at the same time reduces the tensile strength and elongation of propellant.
The influence of the crosslinking density of propellant. This article swelling modulus method is used to test several chain extender to HTPB/IPDI propellant is studied the influence of the crosslinking density. After joining chain extension agent, crosslinking density of propellant were significantly increased, the addition of MOCA make the crosslinking density of propellant was increased by more than 2 times.
Transmission electron microscope (TEM). Transmission electron microscopy (sem) characterization of polyurethane elastomer can directly and effectively in the morphological structure, using two different types of chain extender on simulation of HTPB/IP - DI propellant binder phase composition of the film for tem observation. Every film presents a two phase separation structure, the black part is the dyeing of HTPB soft segment, the white part is formed with hard segment diisocyanate and chain extender. As a result of the hard segment content is low, the micro area scattered in HTPB soft segment hard segment continuous phase, and the size is smaller, the addition of chain extender to significantly alter the two phase structure, clear legibility of the two phase structure.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
Predecessors' research results show that in the HTPB polyurethane elastomer (PUE), micro phase separation morphology, the results of the effect of physical and mechanical properties of the elastomer is bigger. Will get the polymer blend mutually soluble components of performance, performance of components is usually average; And will not be miscibility of polymer blend to get some special performance --, combines the advantages of each component performance.
Micro phase separation of PUE is completely two phase system, is composed of hard and soft segments, phase separation property of PUE, strongly with butyl hydroxy soft segment is non-polar, carbamate hard segment is polarity, two phase miscibility, so get polymer taking advantages of two phase: soft segment is helpful to improve the elongation and elasticity of PUE; Hard segment is beneficial to improve the modulus and strength, the two phase system through chemical bond can be blended with the good adhesive of two-phase polymer.
Because is part of the mix, so both two phase mixture, have pure hard and soft segments, should be able to get three glass transition temperature; In the experiments, however, due to the mixed phase relative to the two pure phase is very few, so the third glass transition temperature can't see, which further proves the butyl hydroxy PUE micro phase separation is complete.
For diol containing hydroxy ethers on both ends of the class and chain extension agent, on the one hand, chain extender and diisocyanate reaction and become hard segment with curing agent components, formed the hard segment phase, make the micro phase separation increases, so the chain extender agent can obviously improve the propellant mechanical properties at low temperature.
Because glycol kind of chain extender, on the other hand, contains only two active hydrogen, it also increases the chain effect, and increases in propellant of hard segment chain elongation increases; Again because of glycol and diisocyanate reaction - NHCOO - the base is a polar group and contains an active hydrogen, so the increase of the chain segment also can form hydrogen bonding, secondary crosslinking, boosting the molecular inter-atomic forces and generate network structure, and it also can improve the tensile strength of the propellant.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Add glycol chain extender, maximum elongation of propellant at room temperature, high temperature slightly higher than the blank formula; Propylene glycol, butyl glycol can improve the tensile strength of propellant at room temperature; And glutaric alcohol and glycol decreased tensile strength. For propylene glycol, when! T!!! = 0.85/4, propellant tensile strength increased by 51.7%, the largest elongation increased by 5.6%.
To join both alcohol chain extender can improve the low temperature of HTPB/IP - DI propellant dehumidifying phenomenon, especially the great increase in the cryogenic propellant maximum elongation. From propylene glycol, butyl glycol, butyl glycol to glycol, HTPB/IPDI propellant is studied under low temperature tensile strength increased by 34.7%, 39.8%, 24.4% and 39.8% respectively; The largest elongation increased by 59.8%, 75.4%, 76.1% and 75.4% respectively.
Besides 2 ethyl toluene diamine, other types of diamine extender chain agent can improve the strength of the propellant and the propellant under normal temperature, high temperature and low temperature elongation slash, urea and MOCA can significantly improve the strength of the propellant.
Including two hydroxyl ether, like a shrink diethylene glycol can improve the propellant at the same time, the tensile strength and elongation of the ether containing two amino but at the same time reduces the tensile strength and elongation of propellant.
The influence of the crosslinking density of propellant. This article swelling modulus method is used to test several chain extender to HTPB/IPDI propellant is studied the influence of the crosslinking density. After joining chain extension agent, crosslinking density of propellant were significantly increased, the addition of MOCA make the crosslinking density of propellant was increased by more than 2 times.
Transmission electron microscope (TEM). Transmission electron microscopy (sem) characterization of polyurethane elastomer can directly and effectively in the morphological structure, using two different types of chain extender on simulation of HTPB/IP - DI propellant binder phase composition of the film for tem observation. Every film presents a two phase separation structure, the black part is the dyeing of HTPB soft segment, the white part is formed with hard segment diisocyanate and chain extender. As a result of the hard segment content is low, the micro area scattered in HTPB soft segment hard segment continuous phase, and the size is smaller, the addition of chain extender to significantly alter the two phase structure, clear legibility of the two phase structure.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
Predecessors' research results show that in the HTPB polyurethane elastomer (PUE), micro phase separation morphology, the results of the effect of physical and mechanical properties of the elastomer is bigger. Will get the polymer blend mutually soluble components of performance, performance of components is usually average; And will not be miscibility of polymer blend to get some special performance --, combines the advantages of each component performance.
Micro phase separation of PUE is completely two phase system, is composed of hard and soft segments, phase separation property of PUE, strongly with butyl hydroxy soft segment is non-polar, carbamate hard segment is polarity, two phase miscibility, so get polymer taking advantages of two phase: soft segment is helpful to improve the elongation and elasticity of PUE; Hard segment is beneficial to improve the modulus and strength, the two phase system through chemical bond can be blended with the good adhesive of two-phase polymer.
Because is part of the mix, so both two phase mixture, have pure hard and soft segments, should be able to get three glass transition temperature; In the experiments, however, due to the mixed phase relative to the two pure phase is very few, so the third glass transition temperature can't see, which further proves the butyl hydroxy PUE micro phase separation is complete.
For diol containing hydroxy ethers on both ends of the class and chain extension agent, on the one hand, chain extender and diisocyanate reaction and become hard segment with curing agent components, formed the hard segment phase, make the micro phase separation increases, so the chain extender agent can obviously improve the propellant mechanical properties at low temperature.
Because glycol kind of chain extender, on the other hand, contains only two active hydrogen, it also increases the chain effect, and increases in propellant of hard segment chain elongation increases; Again because of glycol and diisocyanate reaction - NHCOO - the base is a polar group and contains an active hydrogen, so the increase of the chain segment also can form hydrogen bonding, secondary crosslinking, boosting the molecular inter-atomic forces and generate network structure, and it also can improve the tensile strength of the propellant.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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