News Details
Polyurethane elastomer used chain extender
2017-2-21 11:56:58
Polyurethane elastomer used chain extender, polyurethane elastomer is a kind of important materials applied widely, such as paint, resin adhesives, fiber, and high-performance elastomer products. Polyurethane elastomer block copolymer has good elasticity and hardness change. Make elastic polyurethane has excellent properties of thermodynamic incompatibility is the cause of hard and soft chain segment led to the micro phase separation.
Using micro phase separation and the expansion of the chemical structure of hard and soft chain segment crosslinking agent, the crosslinking density and reaction conditions of strongly affect the mechanical properties and thermal stability of the polyurethane elastomer.
Choose the appropriate diisocyanate and chain extender for polyurethane elastomer eventually have an impact on performance. The mechanical properties of polyurethane elastomer depends on the proportion of soft and hard chain segment and polyurethane elastomer with the structure of the chain extender and length.
Potential applications in biomedical is the requirement of polyurethane elastomer with good biological compatibility, easy to hydrolysis and enzymatic degradation. In order to achieve such a request, polyurethane elastomer general synthetic soft chain segment, such as (poly epsilon - caprolactone polyols), polyester polyol, polycarbonate polyol, and the stability and resistance to hydrolysis, thermal degradation of aliphatic diisocyanate.
Hard segment is usually show determine the intensity of the interaction of hard segment of macroscopic properties. With a lot of hard chain segment polymer structure result in polyurethane elastomer has higher hardness and glass transition temperature. As is known to all, connected to the hydrogen bonding of hydroxyl and N - H and microfacies is an important parameter of design of biodegradable materials. The distribution of the hydrogen bond does not contain branched or structure, or chemical crosslinking hinder the free flow of polymer chain.
The work of polyurethane elastomer are introduced the synthesis of catalyst and the new (HDI) hard chain segment and soft segment (PCLS), as well as the structure of the chain extender agent and crosslinking agent on the effect of thermal and mechanical properties of polyurethane elastomer. This study of polyurethane elastomer with good mechanical properties and processability.
Polyurethane elastomer is generated by two-step polymerization, the average composition of hard segment is controlled by the molar ratio of polyethylene glycol/HDI and glycol chain extender. Synthesis of polyurethane glycol and ternary alcohol ratio is 1:1. Synthesis of polyurethane is under atmospheric pressure, in a 500 ml glass reactor inner stirring and vibration conditions, ratio of NCO and OH and formula.
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
Polyester diol and diisocyanate 2 h under 80 ℃ temperature response, generated polymers, and then mixed with the chain extender under 80 ℃ for 10 min, reaction to detect isocyanate is through the infrared absorption band, the band in 2000-2300 cm - 1, the reaction is completed, otherwise this band. The resulting products into the mold, save 20 h under 80 ℃ temperature, under these conditions, there is no need to use the catalyst. By the preparation of polyurethane elastomer used for mechanical and physical properties of test and research of thermal performance.
Chain extender for polyurethane elastomer structure performance impact testing methods: infrared spectrometer equipped with Bruker70 recorder and Golden Gate ATR specular reflection instrument. Spectra are recorded in the 600-400 cm - 1 frequency range and the standard resolution of 4 cm - 1 thermal stability of polyurethane elastomer, under the condition of the hot air using DERIVATOGRAF Q - 1500 - D thermogravimetric analysis (TGA), TGA scan rate is 10 ℃ / min.
Chain extender for polyurethane elastomer structure performance test methods.
The initial weight of the sample is about 50 MMG, temperature between 30-70 ℃. Differential scanning calorimetry (DSC) is used in the thermal analysis, and heating rate at 10 ℃ / min, heat transformation behavior is in the temperature range of - 100-100 ℃ under the condition of.
: take 10 MMG gradually heating test sample, in order to observe its glass transition temperature (Tg). Dynamic mechanical analysis (DMA) is used to determine the storage modulus (E ') and loss factor (tan and), all the samples in under the condition of constant temperature heating rate of 2 ℃ / min scan - 100-100 ℃ temperature range, the resulting E 'and tan and is shown as 1 hz frequency function.
On the polyurethane board cut out dumbbell samples of stress and strain test, at room temperature using Japanese Shymadzu EZTest instrument equipped with 1 kn weighing sensor for testing. Using cross temperature of 50 mm/min. Use at least five dumbbell polyurethane board samples for testing, and reported an average of their mechanical properties.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Using micro phase separation and the expansion of the chemical structure of hard and soft chain segment crosslinking agent, the crosslinking density and reaction conditions of strongly affect the mechanical properties and thermal stability of the polyurethane elastomer.
Choose the appropriate diisocyanate and chain extender for polyurethane elastomer eventually have an impact on performance. The mechanical properties of polyurethane elastomer depends on the proportion of soft and hard chain segment and polyurethane elastomer with the structure of the chain extender and length.
Potential applications in biomedical is the requirement of polyurethane elastomer with good biological compatibility, easy to hydrolysis and enzymatic degradation. In order to achieve such a request, polyurethane elastomer general synthetic soft chain segment, such as (poly epsilon - caprolactone polyols), polyester polyol, polycarbonate polyol, and the stability and resistance to hydrolysis, thermal degradation of aliphatic diisocyanate.
Hard segment is usually show determine the intensity of the interaction of hard segment of macroscopic properties. With a lot of hard chain segment polymer structure result in polyurethane elastomer has higher hardness and glass transition temperature. As is known to all, connected to the hydrogen bonding of hydroxyl and N - H and microfacies is an important parameter of design of biodegradable materials. The distribution of the hydrogen bond does not contain branched or structure, or chemical crosslinking hinder the free flow of polymer chain.
The work of polyurethane elastomer are introduced the synthesis of catalyst and the new (HDI) hard chain segment and soft segment (PCLS), as well as the structure of the chain extender agent and crosslinking agent on the effect of thermal and mechanical properties of polyurethane elastomer. This study of polyurethane elastomer with good mechanical properties and processability.
Polyurethane elastomer is generated by two-step polymerization, the average composition of hard segment is controlled by the molar ratio of polyethylene glycol/HDI and glycol chain extender. Synthesis of polyurethane glycol and ternary alcohol ratio is 1:1. Synthesis of polyurethane is under atmospheric pressure, in a 500 ml glass reactor inner stirring and vibration conditions, ratio of NCO and OH and formula.
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
Polyester diol and diisocyanate 2 h under 80 ℃ temperature response, generated polymers, and then mixed with the chain extender under 80 ℃ for 10 min, reaction to detect isocyanate is through the infrared absorption band, the band in 2000-2300 cm - 1, the reaction is completed, otherwise this band. The resulting products into the mold, save 20 h under 80 ℃ temperature, under these conditions, there is no need to use the catalyst. By the preparation of polyurethane elastomer used for mechanical and physical properties of test and research of thermal performance.
Chain extender for polyurethane elastomer structure performance impact testing methods: infrared spectrometer equipped with Bruker70 recorder and Golden Gate ATR specular reflection instrument. Spectra are recorded in the 600-400 cm - 1 frequency range and the standard resolution of 4 cm - 1 thermal stability of polyurethane elastomer, under the condition of the hot air using DERIVATOGRAF Q - 1500 - D thermogravimetric analysis (TGA), TGA scan rate is 10 ℃ / min.
Chain extender for polyurethane elastomer structure performance test methods.
The initial weight of the sample is about 50 MMG, temperature between 30-70 ℃. Differential scanning calorimetry (DSC) is used in the thermal analysis, and heating rate at 10 ℃ / min, heat transformation behavior is in the temperature range of - 100-100 ℃ under the condition of.
: take 10 MMG gradually heating test sample, in order to observe its glass transition temperature (Tg). Dynamic mechanical analysis (DMA) is used to determine the storage modulus (E ') and loss factor (tan and), all the samples in under the condition of constant temperature heating rate of 2 ℃ / min scan - 100-100 ℃ temperature range, the resulting E 'and tan and is shown as 1 hz frequency function.
On the polyurethane board cut out dumbbell samples of stress and strain test, at room temperature using Japanese Shymadzu EZTest instrument equipped with 1 kn weighing sensor for testing. Using cross temperature of 50 mm/min. Use at least five dumbbell polyurethane board samples for testing, and reported an average of their mechanical properties.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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