SEQUENTIAL INTERCONNECTED INTERPENETRATING POLYMER NETWORKS OF POLYURETHANE AND POLYSTYRENE .1. SYNTHESIS AND CHEMICAL-STRUCTURE ELUCIDATION

被引:21
作者
PANDIT, SB [1 ]
NADKARNI, VM [1 ]
机构
[1] NATL CHEM LAB,DIV CHEM ENGN,POLYMER SCI & ENGN GRP,POONA 411008,MAHARASHTRA,INDIA
关键词
D O I
10.1021/ma00094a024
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
In-situ sequential semi-interconnected interpenetrating polymer networks (IPNs) based on well-defined unsaturated poly(ester-urethane) (PU) and polystyrene (PS) were synthesized at PU/PS ratios of 100/0, 90/10, 80/20, 70/30, and 50/50, in order to study the effect of length of PS intranetwork bridges on the structure. The structure of these IPNs was studied using various characterization techniques such as swelling behavior in binary solvent mixtures, wide angle X-ray diffraction (WAXD), and solid state C-13 nuclear magnetic resonance (NMR) spectroscopy. The swelling studies showed that PS intranetwork bridges influence the size of the network cages formed. The swelling studies in a binary solvent mixture indicated that the PS intranetwork bridges of up to 6 styrene units (SU) in length are present in the stretched configuration. WAXD studies showed that the effective distance between the chains (d(eff)) increased up to the intranetwork bridge length of 6 SU and decreased on a further increase in the bridge length. Thus, both swelling and WAXD studies indicated that in the IPNs containing longer PS intranetwork bridges the PS chains are in a coiled configuration. This fact was confirmed by C-13 NMR spectroscopy which showed the increased mobility of the PS bridges in the case of the IPNs containing a higher PS content. On the basis of these results, it is proposed that the PU cages are amorphous and present in a coiled configuration, the IPNs containing up to 30% PS had cages containing stretched PS bridges and the IPN containing 50% PS had cages containing coiled PS bridges.
引用
收藏
页码:4583 / 4594
页数:12
相关论文
共 23 条
[1]  
ADACHI H, 1983, POLYM J, V15, P985
[2]  
ADACHI H, 1982, POLYM J, V14, P3791
[3]  
[Anonymous], 1975, POLYM HDB
[4]   DILUTE SOLUTION STUDIES OF NITROGEN-SUBSTITUTED POLYURETHANES [J].
BEACHELL, HC ;
BUCK, JCP .
JOURNAL OF POLYMER SCIENCE PART A-1-POLYMER CHEMISTRY, 1969, 7 (7PA1) :1873-&
[5]  
BEACHELL HC, 1969, J POLYM SCI C, V22, P569
[6]  
Boenig H.V., 1964, UNSATURATED POLYESTE
[7]   SIMULTANEOUS INTERPENETRATING NETWORKS BASED ON CASTOR-OIL ELASTOMERS AND POLYSTYRENE .4. STRESS-STRAIN AND IMPACT LOADING BEHAVIOR [J].
DEVIA, N ;
MANSON, JA ;
SPERLING, LH ;
CONDE, A .
POLYMER ENGINEERING AND SCIENCE, 1979, 19 (12) :878-882
[8]   SIMULTANEOUS INTERPENETRATING NETWORKS BASED ON CASTOR-OIL ELASTOMERS AND POLYSTYRENE .2. SYNTHESIS AND SYSTEMS CHARACTERISTICS [J].
DEVIA, N ;
MANSON, JA ;
SPERLING, LH ;
CONDE, A .
MACROMOLECULES, 1979, 12 (03) :360-369
[9]   SIMULTANEOUS INTERPENETRATING NETWORKS BASED ON CASTOR-OIL ELASTOMERS AND POLYSTYRENE .3. MORPHOLOGY AND GLASS-TRANSITION BEHAVIOR [J].
DEVIA, N ;
MANSON, JA ;
SPERLING, LH ;
CONDE, A .
POLYMER ENGINEERING AND SCIENCE, 1979, 19 (12) :869-877
[10]   SIMULTANEOUS INTERPENETRATING NETWORKS BASED ON CASTOR-OIL ELASTOMERS AND POLYSTYRENE .5. BEHAVIORAL TRENDS AND ANALYSIS [J].
DEVIA, N ;
MANSON, JA ;
SPERLING, LH ;
CONDE, A .
JOURNAL OF APPLIED POLYMER SCIENCE, 1979, 24 (02) :569-582