摘要
以对苯二甲酸二甲酯(DMT)、1,4丁二醇(BD)、聚四氢呋喃醚(PTMG)和端羟基聚丁二烯(HTPB)为原料,采用熔融缩聚方法一步合成了一系列端羟基聚丁二烯改性的聚醚酯弹性体(PBT-co-PTMG/HTPB)。通过红外、核磁和凝胶色谱等分析方法对其分子结构和分子量进行了表征;测定了聚合物的热性能和物理力学性能。结果发现,随着PBT-co-PTMG/HTPB共聚物中端羟基聚丁二烯含量的增加,数均分子量逐渐增大,最高突破8万;玻璃化转变温度由-25℃降低到-65℃,耐低温性能得到明显改善;共聚物力学性能测试结果表明,当HTPB的质量分数在10%以下时,其强度和断裂伸长率随着HTPB含量的增加而变大,但是质量分数超过10%以后,材料的强度和断裂伸长率随其含量的增加而变小。
Terpoly （ester-ether-butadiene） （PBT-co-PTMG/HTPB） was prepared by melt poly-condensation with dimethyl terephthalate （DMT）, 1, 4-butandiol （BD）, poly （tetramethylene-oxide glycol） （PTMG） and hydroxyl terminated polybutadiene （HTPB）. The chemical structure and molecular weight of the polymers were presented by FT-IR, 1H-NMR and GPC. The thermal properties and the physical and mechanical properties were measured. The results show that molecular weights of PBT-co-PTMG/HTPB increase with the content of HTPB increasing, and the maximum molecular weight is more than 8 million. The glass transition temperature moves from -25 ℃down to -65 ℃ due to HTPB units in the soft segments. It represents the nice resistance to low temperature. Both the tensile strength and elongation at break increase with the content of HTPB when the mass fraction of HTPB is below 10 96, but decrease while the mass fraction of HTPB concentration is higher than 10 % in PBT-co-PTMG/HTPB.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2013年第7期21-24,29,共5页
Polymer Materials Science & Engineering
关键词
聚醚酯弹性体
端羟基聚丁二烯
热性能
polyether ester elastomer
hydroxyl terminated polybutadiene
thermal property
