| 摘要: | 本文乃在探討及製造聚胺基甲酸酯(PU)／聚甲基丙烯酸用酯(PMMA)之互穿型。綱狀結構拉擠成型複合材料。事先將MMA預聚合物和杜塞型(Blocked)末端爲NCO基之PU預聚合物相互混合而成爲PU/PMMA互穿型綱狀結構預來合物，然後此預聚合物含浸纖維拉經加熱模具裡瞬時聚合。本研究主要探討玻璃纖維強化PU/PMMA互穿型網狀結構拉擠成型複合材料之加工可行性與材料之機械性質和動態機械性質。由預聚合物之操作時間(pot life)、反應性和纖維含浸情形，可知PU/PMMA互穿型綱狀樹脂具有良好之拉擠成型加工性。由研究結果可知互穿型網狀樹脂複合材料之動態機械性質tanδ位置隨著PMMA含量的增加而往高溫的地方偏移；而其動態儲存模數(G')隨著PMMA含量之增加而增加；互穿型綱狀樹脂複合材料之抗折強度，抗折模數與硬度隨著PMMA含量的增加而提高；而其衝擊強度和膨潤比隨著PMMA含量的增加而減少。
This paper presents a proprietary process developed to manufacture polyurethane (PU)/polymethyl methacrylate (PMMA) interpenetrating polymer networks (IPNs) pultruded composites. The IPNs prepolymer sythesized in this study was prepared from the blends of MMA prepolymer and blocked NCO-terminated PU prepolymer. The processability, mechanical and dynamic mechanical properties of glass fiber rein forced PU/PMMA IPNs composites have been studied. From the investigation of the pot life of resins, the reactivity of ream and fiber wet-out, it was found that the PU/PMMA IPNs show excellent processability for pultrusion. Results show that the tanδ of IPNs composites shifts to the higher temperature with increasing PMMA content, and dynamic shear storage modulus (G') increases with with PMMA content. The flexural strength, flexural modulus and hardness of IPNs composites increase with PMMA Content, however, the impact strength and swelling ratio of IPNa composites decrease with the increasing of PMMA content. |
