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投稿时间：2006-01-20
投稿时间：2006-01-20
中文摘要: 聚甲醛（POM）是一种高结晶性工程塑料，存在缺口敏感，冲击强度低、热稳定性差等缺点。用热塑性聚氨酯(TPU)改性POM，对多种TPU进行了优选，发现聚己内酯共聚酯型TPU综合力学性能比其它TPU好，硬度为80 HA时，与POM在熔融加工中粘度匹配，利于共混，增韧效果优于其它TPU。当TPU含量为40％时，共混物形成双连续相结构，冲击性能发生突变，达75 kJ/m2。共混物的断裂伸长率随TPU含量增加而增大，含40％TPU时，断裂伸长率达到400％。共混物的杨氏模量和拉伸强度随TPU含量的增加而减小。TPU的加入使POM中的添加剂部分迁移到TPU相中，影响了聚甲醛结晶过程。同时发现，TPU可显著提高聚甲醛的热稳定性。
Abstract:Polyoxymethylene (POM) is an important plastic with pretty good properties. However, its poor impact strength and thermo-degradation limit its applications. In this paper, the polycaprolactone based thermoplastic polyurethane (TPU-1) with a Shore A hardness of 80 was selected to toughen POM，because this kind of TPU has the excellent mechanical properties and matchable viscosity with POM at the processing temperature around 190 ℃. The result shows that TPU-1 can effectively enhance the notched impact strength of POM and when the content of TPU increases to 40%, the notched impact strength of POM/TPU-1 blend abruptly increases and the co-continues phase structure forms. The elongation at break increases, while the tensile strength and modulus decrease with the increase of TPU-1 content. TPU-1 can extract some of the additives in POM, affect the crystallization process, and increase the thermo-degradation temperature of POM.
文章编号：20060518 中图分类号： 文献标志码：
基金项目:国家高技术研究发展计划资助项目(863)(2002AAA333070)和云天化集团公司资助项目
作者简介:
引用文本：
程振刚,王 琪.热塑性聚氨酯弹性体改性聚甲醛的研究[J].工程科学与技术,2006,38(5):107-111.
.Study on POM Modification by Thermoplastic Polyurethane Elastomer[J].Advanced Engineering Sciences,2006,38(5):107-111.
引用文本：
程振刚,王 琪.热塑性聚氨酯弹性体改性聚甲醛的研究[J].工程科学与技术,2006,38(5):107-111.
.Study on POM Modification by Thermoplastic Polyurethane Elastomer[J].Advanced Engineering Sciences,2006,38(5):107-111.