Linear aliphatic polyesters were prepared from Pripol 1012, a diacidic C18 fatty acid dimer, and 1,3-propanediol employing a lipase or a titanium tetrabutanoate. Metal-based catalysis (route M) was carried out with a precondensation at 180 °C and 600 mbar followed by a final condensation at 220 °C and 0.3–0.6 mbar. Enzyme catalysis was carried out with an immobilized Candida antarctica lipase B after either a precondensation step at 180 °C and 600 mbar (route E1) or 80 °C and 100 mbar (route E2) and a final condensation at 80 °C and 0.3–0.6 mbar. Polyesters were obtained along routes M, E1, and E2 with weight-average molecular weights, M_w, at final conversion of 84.6, 26.7, and 15.6 kg mol^–1, respectively. The final molecular weight via route E2 was most probably constrained by depletion of 1,3-propanediol during precondensation. Rheological measurements of the polyesters in melt revealed a Newtonian-like behavior at 80 °C. The dynamic viscosities fulfill the Cox–Merz rule. The power law for the viscosity as a function of M_w possesses an exponent of 3.7 ± 0.2. A polyesterdiol of M_n ≈ 6 kDa prepared along route M was used in the synthesis of a polyurethane elastomer with a Young modulus of 2.5 MPa, an elongation at break of 554%, an ultimate tensile strength of 3.5 MPa, and a Shore A hardness of 38.

中文翻译：

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酶和金属催化合成新型生物基聚酯

线性脂族聚酯由Pripol 1012，二酸C18脂肪酸二聚体和1，3-丙二醇采用脂肪酶或四丁酸钛制备。基于金属的催化（路线M）在180°C和600 mbar下进行预缩合，然后在220°C和0.3-0.6 mbar下进行最终缩合。酶催化用的固定化进行南极假丝酵母或者在180℃和600毫巴（路线E1）或80℃和100毫巴（路线E2），并在80℃和0.3〜最终缩合初期缩合步骤之后脂肪酶B 0.6毫巴 沿路线M，E1和E2获得聚酯，其重均分子量M _w为84.6、26.7和15.6 kg mol ^–1的最终转化率， 分别。通过路线E2的最终分子量很可能受到预缩合过程中1,3-丙二醇消耗的限制。聚酯在熔体中的流变学测量表明，在80°C时，其表现出类似牛顿的行为。动态粘度满足Cox–Merz规则。粘度随M _w的幂定律的指数为3.7±0.2。的聚酯二醇中号_Ñ ≈6kDa的制备沿着路线中号是与2.5兆帕，在554％的断裂伸长率，3.5兆帕的极限拉伸强度的杨氏模量的聚氨酯弹性体的合成中使用，和肖氏A硬度的38。