采用高效液相色谱（HPLC）和凝胶渗透色谱（GPC）方法结合胶合板评价,对6种酸性催化剂存在下的落叶松树皮苯酚液化产物,以及所制备的6种树皮胶粘剂进行表征,结果表明,液化催化剂的酸性对苯酚液化树皮产物的结合酚含量、活性功能基数目和分子量有着重要影响,进而影响所制备树皮胶粘剂的活性、凝胶时间、游离甲醛含量、耐水性和甲醛释放量;采用复合酸催化剂液化树皮所制备树皮胶的胶合强度、耐水性和甲醛释放量都优于硫酸单独做催化剂液化树皮制备的树皮胶,可用于环保耐水性结构胶合板的制备,并以硫酸/磷酸=1/1的复合酸催化剂为最佳。
Based on an assumption that the side-reaction of anionic polymerization could be inhibited by controlling the scale between anion and cation of ion-pairs, a special reagent, P-ligand was introduced into the anionic co- polymerization system of styrene/butadiene forming the multi-block copolymers during the reactive extrusion process. Two kinds of copolymers were synthesized with once-feeding processing and twice-feeding processing at different barrel, respectively. The results show that P-ligand can effectively inhibit the crosslinking side-reaction in anionic bulk-polymerization at high temperature, and is also beneficial to increasing the block length of polystyrene in the copolymer. The data obtained by 1H-NMR, GPC, TEM and mechanical testing show that the content of butadiene in block copolymers obtained is over 18 %, and the unnotched charpy impact strength of each copolymer is improved up to 45 kJ/m2 which is similar to that of KR03 resin. The flexural strength of sample PSB-2 increases from 34 MPa to 56 MPa, meanwhile, the increment of flexural modulus and tensile elongation are all over 40%.
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