Control of crystallization in two-phase blends of poly(phenylene sulfide) and poly(vinylpyrrolidone)
Control of crystallization in two-phase blends of poly(phenylene sulfide) and poly(vinylpyrrolidone)
复制标题
聚苯硫醚和聚乙烯基吡咯烷酮两相共混物中结晶的控制
DOI：
10.1002/pcr2.10165
复制
发表时间：
2021
影响因子：
1.9
通讯作者：
H. Saito
中科院分区：
文献类型：
--
作者：
S. Nara;K. Watanabe;H. Oyama;H. Saito
本文首次报道了使用聚（N-乙烯基吡咯烷酮）（PVP）作为控制聚苯硫醚（PPS）熔融结晶行为的有效添加剂。PPS/PVP共混物形成两相，其熔融结晶温度在加入PVP后急剧降低，伴随着结晶开始延迟和结晶速率降低。在等温退火过程中的球晶生长监测显示，在与小于5wt%的PVP的共混物中的PPS的结晶速率的减小是由于成核速率和球晶生长速率的降低，而在具有较高的PVP含量的共混物中的速率下降主要是由于缓慢的成核。观察到PPS的玻璃化转变温度和熔融温度在共混后发生变化，表明共混物是部分混溶的。结晶的延迟可能是由于部分结晶性干扰PVP从晶体生长前沿的排除。
This paper reports for the first time the use of poly(N‐vinylpyrrolidone) (PVP) as an effective additive for controlling the melt crystallization behavior of poly(p‐phenylene sulfide) (PPS). The PPS/PVP blends form two‐phases, whose melt crystallization temperature decreases drastically upon the addition of PVP accompanied by a delayed onset of crystallization and a decreased crystallization rate. Monitoring spherulite growth during isothermal annealing revealed that in blends with less than 5 wt% of PVP the diminution of the crystallization rate of PPS is due to a decrease in both the nucleation rate and the spherulite growth rate, whereas in blends with higher PVP content the falloff in rate is mainly caused by slow nucleation. A change was observed in the glass transition temperature and melting temperature of PPS upon blending, suggesting that the blends are partially miscible. The delay in crystallization is likely due to the partial miscibility disturbing exclusion of PVP from the crystalline growth front.