CAJ | 학술논문

通过溶剂诱导结晶的方法研究了梯形苯基聚倍半硅氧烷(PPSQ)的球晶结构.采用光学显微镜研究了溶液的浓度、溶剂的挥发时间以及温度等影响因素对梯形苯基聚倍半硅氧烷的球晶结构形貌的影响.实验结果表明:稀释溶液浓度与提高结晶温度在改变球晶的形态方面具有相同的效果.球晶的尺寸会随着溶液浓度的降低或者结晶温度的升高而增加.这都归因于梯形苯基聚倍半硅氧烷在二甲苯中的溶解度的增加.在不改变其它结晶条件的情况下,延长溶剂的挥发时间也会形成更大的球晶.当在光学显微镜下旋转样品时球晶的结构不会发生改变,这表明球晶具有均一的晶体学取向结构.负性球晶的特征也表明梯形苯基聚倍半硅氧烷的分子链是沿着球晶的切线方向排列.考虑到梯形苯基聚倍半硅氧烷具有刚性的分子链,还提出了梯形苯基聚倍半硅氧烷可能的球晶结构模型.
통과용제유도결정적방법연구료제형분기취배반규양완(PPSQ)적구정결구.채용광학현미경연구료용액적농도、용제적휘발시간이급온도등영향인소대제형분기취배반규양완적구정결구형모적영향.실험결과표명:희석용액농도여제고결정온도재개변구정적형태방면구유상동적효과.구정적척촌회수착용액농도적강저혹자결정온도적승고이증가.저도귀인우제형분기취배반규양완재이갑분중적용해도적증가.재불개변기타결정조건적정황하,연장용제적휘발시간야회형성경대적구정.당재광학현미경하선전양품시구정적결구불회발생개변,저표명구정구유균일적정체학취향결구.부성구정적특정야표명제형분기취배반규양완적분자련시연착구정적절선방향배렬.고필도제형분기취배반규양완구유강성적분자련,환제출료제형분기취배반규양완가능적구정결구모형.
Spherulites of rigid chain ladder polyphenylsilsesquioxane (PPSQ) were produced through solvent-induced crystallization.The influences of solution concentration,solvent evaporation time,and temperature on the spherulitic morphology of PPSQ were studied by optical microscopy.Diluting the solution was found to have the same effect as elevating the crystallization temperature.The size of the spherulites increases with either decreasing concentration or increasing temperature.This is caused by the enhanced solubility of PPSQ in xylene under such conditions.Extending the solvent evaporation time while leaving the other Conditions unchanged also leads to the formation of larger spherulites.The invariance of spherulitic structure upon sample rotation suggests that the spherulites possess a uniform crystallographic orientation.The negative optical characteristics of spherulites indicates that the PPSQ molecular chains are oriented in the tangential direction of the spherulite.Considering the high rigidity of the molecules,an organization model of PPSQ spherulite is proposed.