偶联剂对聚丁烯–1/碳酸钙复合材料性能的影响

采用硅烷、铝酸酯和钛酸酯偶联剂对碳酸钙进行表面处理,并以聚丁烯–1为基体制备了聚丁烯–1/碳酸钙复合材料,研究了这3种偶联剂对复合材料性能的影响。结果表明,钛酸酯和铝酸酯偶联剂对碳酸钙改性的效果最好,其中铝酸酯偶联剂改性的碳酸钙接触角最大,对复合材料的增韧效果最明显,当铝酸酯偶联剂改性的用量为碳酸钙的1.5%时,改性后的碳酸钙接触角可达162.4°,相应的复合材料缺口冲击强度由未改性时的21.5 k J/m2提高至31.7 k J/m2。对铝酸酯偶联剂改性碳酸钙填充的复合材料的结晶性能及微观结构进行了分析与表征,发现铝酸酯偶联剂改性碳酸钙能够提高聚丁烯–1的结晶度,在基体内形成紧密堆积的细小球晶;铝酸酯偶联剂改性碳酸钙在聚丁烯–1中的分散性较佳,无明显团聚现象,与聚丁烯–1界面结合能力强,能够吸收形变功,提高复合材料的韧性。

Inlfuences of Coupling Agents on Properties of Polybutene-1/Calcium Carbonate Composites

Polybutene-1/calcium carbonate composites were prepared with polybutene-1 as matrix by using different coupling agents including silane,titanate and aluminate for surface treatment of calcium carbonate. The effects of the three coupling agents on the properties of the composites were studied. The results show that the titanate and aluminate coupling agents have the best modi-fication effects for calcium carbonate,among them,the calcium carbonate modified by aluminate coupling agent has the maximum contact angle and the most obvious toughening effects. When the content of aluminate coupling agent is 1.5% of calcium carbonate mass,the contact angle of the modified calcium carbonate can reach 162.4° and the notched impact strength increases from 21.5 kJ/m2 (unmodified) to 31.7 kJ/m2. The crystallization and micro-structure of the compositesfilled with calcium carbonate modi-fied by aluminate coupling agent were analyzed,it is found that the crystallization of polybutene-1 can be improved with addition of calcium carbonate modified by aluminate and compact packed tiny crystal ball is formed in matrix. Calcium carbonate modified by aluminate has better dispersion in polybutylene-1 with no obvious agglomeration and has strong interface binding capacity with poly-butylene-1,it can absorb deformation work to improve the toughness of the composite.