摘要
用双螺杆挤出机制备了间规聚苯乙烯/高抗冲聚苯乙烯(sPS/HIPS)共混物,用差示扫描量热仪和X射线衍射仪研究了HIPS对sPS熔体结晶和冷结晶行为、晶型的影响。结果表明,熔融温度为290℃时,少量HIPS提高sPS熔体结晶温度,但HIPS含量增加降低sPS熔体结晶温度。熔融温度高于300℃时,sPS熔体结晶温度随HIPS含量的增加而降低。熔融温度从290℃提高到300℃,sPS结晶温度降低,结晶热明显增加。sPS冷结晶峰温随HIPS含量增加和扫描速率加快而提高,HIPS对sPS的结晶主要起阻碍作用。退火处理使得sPS和sPS/HIPS生成α和β晶,且随着HIPS含量的增加,α晶含量增大。
Syndiotaetie polystyrene/highly-impact polystyrene （sPS/HIPS） blends were prepared by twin-screw extruder. Differential scanning calorimetry and wide angle X-ray diffractometry were used to investigate the effect of HIPS, melting temperatures and heating rates on the melt-crystallization and cold-crystallization behavior, and crystal forms of syndiotatic polystyrene. The experimental results indicate that addition of low content of HIPS increases the melt-crystallization temperatures of sPS and high content of HIPS decreases the melt-crystallization temperatures of sPS crystallized dynamically from 290℃. However, the melt-crystallization temperatures of sPS decrease with increasing the content of HIPS in the blends crystallized dynamically from 300 ℃. The melt-crystallization temperatures decreases and crystallization enthalpy significantly increases for sPS and sPS/HIPS blends as the melting temperature increasing from 290 ~C to 300℃. The cold-crystallization temperatures of sPS also shifts to higher temperatures as the content of HIPS and the scanning rate increases, sPS and sPS/HIPS blends tend to produce both a and β crystals after annealing at 250 ℃, and high content of HIPS facilitates the formation of a crystals.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2007年第5期100-103,共4页
Polymer Materials Science & Engineering
关键词
间规聚苯乙烯
高抗冲聚苯乙烯
结晶行为
syndiotaetie polystyrene
highly-impact polystyrene
crystallization behavior
