Abstract: Disclosed are a semi-aromatic polyester, and a preparation method therefor and a use thereof. In the present invention, on the basis of the total molar amount of diacid, the molar content of a repeating unit —CH2CH2CH2CH2—O— in dimer(1,4-butanediol) is controlled to be 0.05-0.35 mol %, which can effectively improve the resin color of the semi-aromatic polyester.

Abstract: The present invention discloses a semi-aromatic polyester, and a preparation method therefor and an application thereof. The semi-aromatic polyester has a specific scope of double bond content. Compared with the existing semi-aromatic polyester, the semi-aromatic polyester of the present invention has better melting heat retention stability and fine color.

Abstract: The present invention discloses a semi-aromatic polyester, a preparation method therefor and use thereof. The content of hydroxyl in a semi-aromatic polyester is controlled, and particularly, the content of hydroxyl linked to aliphatic dicarboxylic acid in the semi-aromatic polyester is controlled to 17-40 mmol/kg, the content of hydroxyl linked to aromatic dicarboxylic acid in the semi-aromatic polyester is controlled to 17-40 mmol/kg, and the total content of hydroxyl is controlled to 35-80 mmol/kg, such that the compatibility of the semi-aromatic polyester with materials, e.g., polylactic acid can be significantly improved, thereby obtaining a high-strength tear-resistant film material.

Abstract: The present invention relates to a semi-aromatic polyether ester, a preparation method therefor and use thereof. The semi-aromatic polyether ester includes repeating units derived from the following components: a first component A, based on the total molar amount of the first component A, including: a1) 35-65 mol %, and preferably 40-60 mol % of at least one aliphatic dicarboxylic acid or an ester derivative thereof, or an anhydride derivative thereof, and a2) 35-65 mol %, and preferably 40-60 mol % of at least one aromatic dicarboxylic acid or an ester derivative thereof, or an anhydride derivative thereof; a second component B: 1,4-butanediol; and a third component C: poly(1,4-butanediol) having a molecular formula of HO—(CH2CH2CH2CH2—O)n—H, where n is an integer from 2 to 200; based on the total molar weight of the first component A, the molar content of the repeating unit-CH2CH2CH2CH2—O— in the third component C is 1.5-5.

Abstract: Disclosed is a method for causal inference based on collective movement of active group, comprising obtaining leader time series and follower time series of the collective movement of the active group; obtaining fixed time lag, obtaining optimal fixed time lag based on the fixed time lag, obtaining aligned time lag series based on the leader time series and follower time series; relaxing the fixed time lag, updating the optimal fixed time lag based on the relaxed results; obtaining optimal aligned time lag series based on the aligned time lag series and the updated optimal fixed time lag; distorting the leader time series and the follower time series based on the optimal aligned time lag series; performing Grange Causality inference on the distorted leader time series and follower time series to obtain results of Granger Causality inference of the collective movement of the active group.

Abstract: The present invention discloses a biodegradable polyester composition, wherein the biodegradable polyester composition comprises the following components in parts by weight: i) 58 to 80 parts by weight of an aliphatic-aromatic copolyester; ii) 20 to 32 parts by weight of starch; and iii) 0 to 10 parts by weight of a processing agent. The present invention unexpectedly found by research that by using an aliphatic-aromatic copolyester in which an amount of aromatic carboxylic acid accounts for a total amount of diacid is 44 mol % to 48 mol % as a matrix resin, where the aliphatic-aromatic copolyester has a crystallization peak width D of 5° C. to 16° C.

Abstract: The present invention discloses a biodegradable polyester composition, wherein the biodegradable polyester composition comprises the following components in parts by weight: i) 58 to 80 parts by weight of an aliphatic-aromatic copolyester; ii) 20 to 32 parts by weight of starch; and iii) 0 to 10 parts by weight of a processing agent. The present invention unexpectedly found by research that by using an aliphatic-aromatic copolyester in which an amount of aromatic carboxylic acid accounts for a total amount of diacid is 44 mol % to 48 mol % as a matrix resin, where the aliphatic-aromatic copolyester has a crystallization peak width D of 5° C. to 16° C.