【摘要】 本工作用同步法合成了聚丁二烯型聚氨酯/聚(苯乙烯-二乙烯苯)互穿聚合物网络[PU(IITPB)/P(St-DVH)-IPN]。经红外光谱分析和抽提实验证明,PU(HTPB)和 P(St-DVB)间主要是形成聚合物网络的互穿,而网络间的化学结合甚少。透射电镜观察表明,该 IPN体系呈现特殊的细胞状结构,在聚合物组分的质量比为30/70—40/60时会形成双重相连续,相界面过渡层的互穿最大。动态力学温度谱和差示扫描量热法测定结果说明,网络的互穿和强迫互容主要发生在PU(HTPB)的硬段区和P(St-DVB)之间。该体系的力学性能远优于PU(HTPB)。同样条件下,PU(HTPB)的拉伸强度和扯断伸长率分别为2.84MPa和600％,而IPN则分别达到 11.76 MPa 和 800％。更多还原

【Abstract】 The IPNs of polybutadiene-based polyurethane/poly (styrene-divinyl-benzene)[PU(HTPB)/P(St-DVB)-IPN]were synthesized by simultaneous polymerization. The results of FTIR and extraction experiment show that PU(HTPB)and P ( St-DVB) form interpenetrating polymer networks which contain little quantities of chemically-bonded copolymers of PU-(HTPB)and P ( St-DVB ). TEM confirms that the IPNs exhibit a special cellular structure which, within the range of P ( St-DVB ) content from 30% to 60%, forms the dual phase continuity.The results of DMS and DSC indicate that the interpenetration and the "forced compatibility" between the hard domains of PU(HTPB)and P(St-DVB) are more obvious than between the soft segments of PU(HTPB) and P(St-DVB). The mechanical properties of the IPNs are far more better than those of PU(HTPB). Under the same test conditions, the tensile strength and the elongation at break of PU(HTPB) are 2.84 MPa and 600%, respectively; whereas the tensile strength and the elongation at break of IPNs are 11.76 MPa and 800%, respectively.更多还原