The intermediate to later stage of the spinodal decomposition of off-critical mixture of poly (methyl methacryate) ( PMMA ) and poly ( styrene-co-acryonitrile ) ( PSAN) was investigated by the time-resolved light-scat...The intermediate to later stage of the spinodal decomposition of off-critical mixture of poly (methyl methacryate) ( PMMA ) and poly ( styrene-co-acryonitrile ) ( PSAN) was investigated by the time-resolved light-scattering technique.lt is shown that during unmixing process there exist power relations of maximum scattered intensity Im(t)and its corresponding wave vactor to time t. In the later stage the scaling relation of structure funcfion S (q, t) with wave vactor qm and β=3α were found. In the intermediate stage some relationship of structure function S(q,t) with wave vactor q was revealed.展开更多
Research and development of green oxidizers and green fuels as a possible replacement for ammonium perchlorate(NH4ClO4,AP) and hydrazine(N2H4) respectively has been increased considerably in the recent years.AP and hy...Research and development of green oxidizers and green fuels as a possible replacement for ammonium perchlorate(NH4ClO4,AP) and hydrazine(N2H4) respectively has been increased considerably in the recent years.AP and hydrazine are the oxidizer and fuel entities,and used in solid and liquid rocket motors respectively.AP is highly toxic and led to adverse health effects,while hydrazine is carcinogenic in nature.AP is in use from the last several decades for rocket and space shuttle propulsion,while hydrazine is used in upper stage liquid propelled rocket motors.It’s a tough task to replace AP with the currently available green oxidizers;since their ballistic properties are weaker when compared to AP and also they can’t be successfully deployed in a solid rocket motor at present Some important available solid green oxidizers are ammonium nitrate(AN),ammonium dinitramide(ADN),hydroxyl ammonium nitrate(HAN),and hydrazinium nitroformate(HNF).However,AN is one of the cheap and readily available oxidizer,and has great potential to use in solid/liquid rocket motors.Tremendous progress has been envisaged till now,and more progress will be there in the coming future over the development of AN based green energetic materials(GEM’s).A concise overview has been presented over the development of phase stabilized ammonium nitrate(PSAN) and AN/KDN based green oxidizers in the present review paper.展开更多
文摘The intermediate to later stage of the spinodal decomposition of off-critical mixture of poly (methyl methacryate) ( PMMA ) and poly ( styrene-co-acryonitrile ) ( PSAN) was investigated by the time-resolved light-scattering technique.lt is shown that during unmixing process there exist power relations of maximum scattered intensity Im(t)and its corresponding wave vactor to time t. In the later stage the scaling relation of structure funcfion S (q, t) with wave vactor qm and β=3α were found. In the intermediate stage some relationship of structure function S(q,t) with wave vactor q was revealed.
文摘Research and development of green oxidizers and green fuels as a possible replacement for ammonium perchlorate(NH4ClO4,AP) and hydrazine(N2H4) respectively has been increased considerably in the recent years.AP and hydrazine are the oxidizer and fuel entities,and used in solid and liquid rocket motors respectively.AP is highly toxic and led to adverse health effects,while hydrazine is carcinogenic in nature.AP is in use from the last several decades for rocket and space shuttle propulsion,while hydrazine is used in upper stage liquid propelled rocket motors.It’s a tough task to replace AP with the currently available green oxidizers;since their ballistic properties are weaker when compared to AP and also they can’t be successfully deployed in a solid rocket motor at present Some important available solid green oxidizers are ammonium nitrate(AN),ammonium dinitramide(ADN),hydroxyl ammonium nitrate(HAN),and hydrazinium nitroformate(HNF).However,AN is one of the cheap and readily available oxidizer,and has great potential to use in solid/liquid rocket motors.Tremendous progress has been envisaged till now,and more progress will be there in the coming future over the development of AN based green energetic materials(GEM’s).A concise overview has been presented over the development of phase stabilized ammonium nitrate(PSAN) and AN/KDN based green oxidizers in the present review paper.
