摘要
用差示扫描量热法(DSC)研究了纳米CaCO3/PP和改性纳米CaCO3/PP的非等温和等温结晶的多熔融行为。结果表明纳米CaCO3明显提高PP的结晶温度,诱导PP形成β晶。反应性单体改性纳米CaCO3/PP的结晶温度进一步提高,但对β晶熔融峰强影响不大。而在引发剂存在下反应性单体改性的纳米CaCO3/PP,促进β晶的熔融峰强明显增强。PP出现双熔融峰与PP形成β晶或者在等温结晶时形成两种不同形态有关。结晶温度提高,双峰移向高温;纳米CaCO3/PP的高温熔融峰高比低温熔融峰的高,但改性纳米CaCO3/PP在较高结晶温度时,高温熔融峰高反而比低温熔融峰的低。延长等温结晶时间对熔融峰温影响不大。
The multiple melting behaviors of nano-CaCO3/PP and modified nano-CaCO3/PP crystallized isothermally and dynamically were studied by DSC. The results showed that addition of nano-CaCO3 increased the crystallization temperature of PP due to the heterogeneous nucleation of nano-CaCO3, and induced the formation of β-form of PP crystallization. The crystallization temperature of nano-CaCO3/PP modified by acrylic acid further increased. Modification of nano-CaCO3/PP by acrylic acid in the presence of DCP was favorable to the formation of β-form of PP crystallization. The multiple melting behavior of PP is attributed to the formation of β-and α-form of PP crystallization or different morphologies in the isothermal crystallization. For nano-CaCO3/PP and modified nano-CaCO3/PP crystallized isothermally, both the higher and lower melting peaks shifted to higher temperature with increasing the crystallization temperature. The intensity of higher melting peak of nano-CaCO3/PP was higher than that of the lower melting peak. However, the intensity of higher melting peak of the modified nano-CaCO3/PP crystallized at higher temperatures was lower than that of the lower melting peak.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第2期41-45,共5页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金资助项目(50573094)
教育部博士生点基金资助项目
广州市科技计划资助项目(2005Z3-D2131)
