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以乳酸为原料、辛酸亚锡为催化剂,采用梯度升温法,在170℃、0.098 MPa条件下直接熔融缩聚合成端羧基共聚物P(LA/SA).将其用2,2-(1,3-亚苯基)-二噁唑啉(1,3-PBO)扩链,按n(—COOH)/n(—oxazoline)=1∶1.4比例加入1,3-PBO,在150℃,0.098 MPa条件下反应15 min制得聚酰胺酯(PEA).采用GPC、FTIR、1H-NMR、DSC、XRD、TGA、SEM等手段对聚合物的结构进行了表征和性能测试.结果表明,与P(LA/SA)相比,扩链产物相对分子质量大幅度提高,重均分子量达36×104;产物Tg比PLA升高,材料的刚性增强;产物热稳定性能提高,为一步分解;产物结晶度较P(LA/SA)降低,其柔韧性较P(LA/SA)增强,但相对于PLA有所降低.
Using lactic acid as raw material and stannous octoate as catalyst, the terminal carboxyl copolymer P (LA / SA) was directly melt-polycondensated at 170 ℃ and 0.098 MPa using a gradient-heating method, which was treated with 2,2- (1,3 -phenylene) -dioxazoline (1,3-PBO) was added to 1,3-PBO at a ratio of n (-COOH) / n (-oxazoline) = 1: 1.4. (PEA) under the conditions of reaction for 15 min.The structure of the polymer was characterized and tested by means of GPC, FTIR, 1H-NMR, DSC, XRD, TGA, SEM etc. The results showed that with the P LA / SA), the molecular weight of the chain extended significantly increased, the weight average molecular weight was 36 × 104, the Tg of the product was higher than that of PLA, and the rigidity of the material was enhanced. The thermal stability of the product was improved, Compared with P (LA / SA), the flexibility of P (LA / SA) is enhanced, but it is lower than that of PLA.