摘要
用ＤＳＣ研究了熔融时间（ｔｍｅｌｔ）和高温退火结晶时间（ｔａ）对聚苯硫醚（ＰＰＳ）和结晶性聚醚醚酮（ＰＥＥＫ）对ＰＰＳ的多熔融行为的影响。２７５℃退火结晶≤３ｈ样品呈现熔融双峰，Ｔｍ１＜退火结晶温度（Ｔａ）＜Ｔｍ２；然而，ｔａ＝１２ｈ时，熔融双峰的峰温均高于Ｔａ和无退火结晶ＰＰＳ的熔点（Ｔｍ）。ＰＥＥＫ加入对ＰＰＳ玻璃态和熔体结晶均起到阻碍作用，共混物在ＰＰＳ的Ｔｍ２以上形成１个高温吸热峰（Ｔｍ３），其峰温在３１０℃以上，且随ｔａ延长而移向高温。
The effect of melting time ( t melt ) and annealing crystallization time ( t a) at high temperature on the multiple melting behavior of polyphenylene sulfide (PPS) and PPS component in crystal/crystal blends of PPS/PEEK (polyether ether ketone) has been investigated by differential scanning calorimetry (DSC). When PPS is annealed at 275 ℃ for<3 h, the double endotherm peak has been observed and the lower melting peak temperature ( T m1 )<annealing temperature ( T a)<the upper melting peak temperature ( T m2 ). As the T melt is increased, T m1 and T m2 shift to lower temperature and the intensity of T m2 and heat of fusion (Δ H m) significantly decrease. T m1 decreases and T m2 increases with increasing the annealing crystallization time. However, T m1 and T m2 of PPS annealed at 275 ℃ for 12 h are higher than T a and T m of PPS, suggesting that more than one kind of distribution of crystal perfection may occur when PPS is annealed at high temperature for a sufficiently long residence time. T m1 and T m2 of PPS component in its blends shift to lower temperature and the decrease in intensity of T m2 , heat of fusion, temperatrue ( T c) and heat (Δ H c) of crystallization are observed due to the decrease in the crystllizability of PPS by addition of PEEK. An additional third melting peak ( T m3 > T m2 ) could be observed for the blends melted at 360 ℃ for 30 min and annealed at 275 ℃ for<1 h. The temperature of T m3 is above 310 ℃ and increased as the t a is increased.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1997年第5期68-72,共5页
Polymer Materials Science & Engineering
基金
国家自然科学基金
中山大学前沿研究课题项目
关键词
结晶
共混物
聚苯硫醚
聚醚醚酮
crystal/crystal blend, polyphenylene sulfide, polyether ether ketone, multiple melting behavior
