Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
ACS Appl Mater Interfaces. 2009 Aug;1(8):1650-5. doi: 10.1021/am900314k.
Poly(propylene carbonate) (PPC), a polymer produced from CO2, has been melt-mixed with 30 wt % poly(methyl methacrylate) (PMMA) with the aim of enhancing the physical properties of PPC for practical use but keeping a relatively high CO2 fixing rate in the compound. The observation of a coarse phase structure with a large PMMA domain size and a large size distribution in the blend indicates the immiscibility between PPC and PMMA. The addition of a small amount of poly(vinyl acetate) (PVAc) not only shifts the glass transition temperatures (T(g)'s) of both PPC and PMMA markedly but also significantly increases the modulus and tensile strength of the blend. The prepared compound with 5 per hundred parts of resin PVAc shows a 26 times higher elastic modulus and an approximately 3.8 times higher tensile strength than pure PPC at room temperature. The morphological investigation indicates that the incorporation to PVAC not only induces the finer dispersion of PMMA in the PPC matrix but also results in the phase transformation from a sea-island to a co-continuous structure.
聚（碳酸丙烯酯）（PPC）是一种由 CO2 合成的聚合物，将其与 30wt%的聚甲基丙烯酸甲酯（PMMA）熔融共混，目的是提高 PPC 的物理性能使其达到实用化，同时保持化合物中较高的 CO2 固定率。共混物中存在较大的 PMMA 畴尺寸和较大的尺寸分布的粗糙相结构表明 PPC 和 PMMA 之间的不混溶性。少量聚醋酸乙烯酯（PVAc）的添加不仅显著改变了 PPC 和 PMMA 的玻璃化转变温度（T(g)），而且显著提高了共混物的模量和拉伸强度。在树脂中添加 5phr 的 PVAc 制备的化合物在室温下的弹性模量比纯 PPC 高 26 倍，拉伸强度高 3.8 倍左右。形态学研究表明，PVAc 的加入不仅使 PMMA 在 PPC 基体中得到更细的分散，而且导致相结构从海-岛结构转变为共连续结构。
