The differential FT-IR spectroscopic method was used to identify the polyborate anions in aqueous solutions during dissolution and transformation of 2MgO·2B 2O 3 ·MgCl 2·14H 2O in 6.45%H 3BO 3 solution ...The differential FT-IR spectroscopic method was used to identify the polyborate anions in aqueous solutions during dissolution and transformation of 2MgO·2B 2O 3 ·MgCl 2·14H 2O in 6.45%H 3BO 3 solution at 30℃. The recorded IR-spectroscopic frequencies of the borate aqueous solution subtract, with that of water as a bland value and their assignments were given. The existing forms of polyborate anions and thir interaction in three boron-con-taining aqueous solutions have been proposed. On the basis of solution structure, the mechanisms of dissolution and phase transformation of chlorpinnoite in 6.45% H 3BO 3 solution at 30℃ have been discussed.展开更多
采用傅里叶变换红外(FT-IR)光谱法研究了二聚脂肪酸二异氰酸酯(DDI)/端羟基聚丁二烯(HTPB)体系的固化反应动力学,并与异佛尔酮二异氰酸酯(IPDI)/HTPB体系进行了比较。初步探索了DDI在HTPB推进剂中的应用。结果表明,DDI/HTPB体系的固化...采用傅里叶变换红外(FT-IR)光谱法研究了二聚脂肪酸二异氰酸酯(DDI)/端羟基聚丁二烯(HTPB)体系的固化反应动力学,并与异佛尔酮二异氰酸酯(IPDI)/HTPB体系进行了比较。初步探索了DDI在HTPB推进剂中的应用。结果表明,DDI/HTPB体系的固化反应为二级反应,表观活化能为37.02 k J·mol-1,相比IPDI/HTPB体系降低了3.5 k J·mol-1,说明DDI的反应活性稍高于IPDI,反应活性适中,可作为低毒固化剂应用于HTPB推进剂中。DDI/HTPB体系推进剂具有较好的常温力学性能,抗拉强度为0.85 MPa时,最大伸长率为44.1%,可基本满足推进剂的常温力学性能要求。展开更多
文摘The differential FT-IR spectroscopic method was used to identify the polyborate anions in aqueous solutions during dissolution and transformation of 2MgO·2B 2O 3 ·MgCl 2·14H 2O in 6.45%H 3BO 3 solution at 30℃. The recorded IR-spectroscopic frequencies of the borate aqueous solution subtract, with that of water as a bland value and their assignments were given. The existing forms of polyborate anions and thir interaction in three boron-con-taining aqueous solutions have been proposed. On the basis of solution structure, the mechanisms of dissolution and phase transformation of chlorpinnoite in 6.45% H 3BO 3 solution at 30℃ have been discussed.
文摘采用傅里叶变换红外(FT-IR)光谱法研究了二聚脂肪酸二异氰酸酯(DDI)/端羟基聚丁二烯(HTPB)体系的固化反应动力学,并与异佛尔酮二异氰酸酯(IPDI)/HTPB体系进行了比较。初步探索了DDI在HTPB推进剂中的应用。结果表明,DDI/HTPB体系的固化反应为二级反应,表观活化能为37.02 k J·mol-1,相比IPDI/HTPB体系降低了3.5 k J·mol-1,说明DDI的反应活性稍高于IPDI,反应活性适中,可作为低毒固化剂应用于HTPB推进剂中。DDI/HTPB体系推进剂具有较好的常温力学性能,抗拉强度为0.85 MPa时,最大伸长率为44.1%,可基本满足推进剂的常温力学性能要求。
