]) and thermal stability of hybrid materials (PB-Si) were studied
in which SiO
2
nanoparticles were covalently attached and pendants along high
cis
polybutadiene (PB) macromolecular chains. Isothermal crystallization characteristics and SiO
2
dispersion in PB matrix of PB-Si hybrid and PB/SiO
2
blend (PB/Si) with the same SiO
2
contents were conducted. The microstructure of Bd units in PB-Si was characterized by Fourier transform infrared spectroscopy (FTIR) and the
cis
-1
4 content was determined based on the characteristic absorption in FTIR spectrum. The SiO
2
content of PB-Si was measured by thermal gravimetric analysis (TGA). The intrinsic viscosity of PB-Si in toluene was tested by Ubbelohde viscometer. Effects of SiO
2
content and microstructure (
cis
-1
4 configuration) on the isothermal crystallization kinetics
crystal morphology and spherulite growth rate of the hybrid materials at low temperatures were investigated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM) equipped with
in situ
heating and cooling device. The results show that the intrinsic viscosity and the
cis
-1
4 contents of Bd units of PB-Si remained almost the same
and thermal stability could be improved with increasing SiO
2
content in the materials when SiO
2
content was less than 2.5%. For two series of PB-Si-Ni and PB-Si-Nd hybrids
their
cis
-1
4 contents were determined to be around 96.6% and 98.6% respectively. PB-Si hybrid materials exhibited a much higher crystallization rate compared to PB/Si blends by keeping the
cis
-1
4 contents and SiO
2
content at the same. The crystallization rate increased by introducing a small amount of covalently linked SiO
2
nanoparticle pendants along the macromolecular chains. The crystallization of PB-Si hybrid materials could be accelerated and the half-crystallization time (
t
1/2
) decreased with increasing SiO
2
content. PB-Si-Nd hybrid materials with highly linear chains possessed a higher crystallization rate than PB-Si-Ni with short branched chains by keeping
cis
-1
4 content and SiO
2
at the same. The crystallization rate of PB-Si-Nd hybrid materials could be further increased with increasing both SiO
2
and
cis
-1
4 contents. The Avrami exponents (
n
) for PB-Si hybrid materials with various topological structures were determined to be in the range of 2.0 − 3.0
which indicated a three-dimensional spherulite growth of PB-Si under isothermal condition at low crystallization temperature. The growth rate of spherulites increased with the increase in SiO
2
content while keeping other conditions almost the same. The crystallization rate could increase with increased
cis
-1
4 content
linearity of chain structure and SiO
2
content.
关键词
高顺式聚丁二烯杂化材料链结构等温结晶动力学
Keywords
High cis polybutadieneHybrid materialsChain structureIsothermal crystallization kinetics
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Related Institution
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