以马来酸酐和己二胺为原料制备出了一种新型的马来酰己二胺酸单体（HOOC-MAH-HDA-NH2）,然后采用自由基熔融接枝技术将HOOC-MAH-HDA-NH2引入到PDLLA骨架中,形成了结构与己二胺改性聚乳酸（HMPDLLA）相似的MHP-DLLA材料。采用红外光谱（FT-IR）、核磁共振氢谱（1 H NMR）、核磁共振碳谱（13 C NMR）和DEPT 135对HOOC-MAH-HDA-NH2和MHPDLLA的化学结构进行了定性和定量表征。以PDLLA为空白,HMP-DLLA为对照,对MHPDLLA的分子量进行了测定。结果表明采用新的合成工艺使聚合物的分子量从原有的66%～68%降低到了33%～34%,且合成路线更简单。在合成路线和合成工艺上的创新为MHPDLLA用作生物活性材料或仿生材料的基质材料开辟了更广阔的空间。
A novel synthesis technology was designed in this study： firstly,a new monomer maleic hexanediamine acid（HOOC-MAH-HDA-NH2） was synthesized by reacting maleic anhydride（MAH） with hexanediamine（HDA）,which was then incorporated onto poly（DL-lactic acid）（PDLLA） backbone by free radical graft copolymerization.Theoretically,the obtained polymer（MHPDLLA） has similar chemical structure to the hexanediame modified PDLLA（HMPDLLA） obtained by the traditional technology.Results from FT-IR,1H NMR,13C NMR and DEPT135 verified the chemical structures of HOOC-MAH-HDA-NH2 and MHPDLLA.Furthermore,the molecular weights detection via gel permeation chromatography with multi-angle laser light scattering（GPC-MALLS） indicated that,the molecular weight loss of MHPDLLA compared to PDLLA was 33%-34% while HMPDLLA was 66%-68%.This suggested that this new synthesis technology was effective in preventing PDLLA from aminolysis,and may hopefully promoted the applications of MHPDLLA as a base material for preparation of bioactive or biomimetic materials.
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