硝酸酯聚醚与聚丁二烯等粘合剂的共混及其聚氨酯胶片特性的研究

硝酸酯聚醚与聚丁二烯等粘合剂的共混及其聚氨酯胶片特性的研究 STUDIES ON PROPERTIES OF POLYURETHANE RUBBERS OF BLENDS OF NITRATE GROUP CONTAINING POLYETHERS WITH POLYBUTA-DIENE POLYTETRAHYDROFURAN OR COPOLYMER OF, TETRAHYDROFURAN AND PROPYLENE OXIDE 徐羽梧 first-author 董世华 周曼莉 范昌烈 邓可喜 张小慧 王富华 汪文学 王洪祚 将液态的端羟基硝聚醚与端羟基聚丁二烯、聚四氢呋喃或共聚聚醚等进行共混,交联后所得聚醚聚氨酯胶片大多数具有两个玻璃化温度（Tg）。一个是共聚聚醚等软链段的Tg（-73--80℃）,另一个是硝酸酯聚醚硬链段的Tg（-15—-27℃）。由于胶片具有两个Tg,因而在低温下（-40℃）胶片具有良好的弹性。用共混胶片作固推剂或火炸药的粘合剂有可能改善上述单一胶种的综合性能。 Some crosslinked polyurethane rubbers have been prepared by the reaction of toluene diisoeyuate with the bicomponent blends of liquid poly （glycidyl nitrate） [PI] or poly （β—2,3-epoxypropoxy ethyl nitrate）[pⅡ] with polybu-tadiene [PBD]、polytetrahydrofuran [PTHF] or copolymer of tetrahydro-furan and propylene oxide [PTHF—PO] containing terminal hydroxy groups. The mechanical properties of these blend rubbers have also been investigated. It is found that most of these blend rubbers have two glass transition temperatures （Tg）when the two components are blended in appropriate propor-tions （from 7 to 3 or 3. to 7 by weight）, One of them is characterized by the Tg of soft segments of PBD（or PTHF, or PTHF—PO）（-73—-80℃） and the other represents the Tg of rigid segments of PI （or PⅡ）（-15—-27℃）. The elasticity of the blend rubbers possessing two Tg at low temperature （-40℃） is more better than that of the rubbers obtained fromthe correspon-ding random copolymer of monomer I（or Ⅱ） with THF, having only single Tg （-38—-40℃）. For example, the maximum elongation （ε m ） of the blend ru-bber（PI:PTHF—PO=1:1 by weight） at -40℃ is about 270%, but for the random copolymer （monomer I with THF ）the value is only about 4%, altho-ugh the contents of NO 3 in both polymers are nearly the same. 1984-03-01 2021-04-01 3