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A cyclic structure and group technology, applied in the field of membranes, can solve problems such as the deterioration of the working environment, and achieve the effect of inhibiting odor, inhibiting the generation of odor, and improving the working environment
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[0205]Specific examples of tetracarboxylic anhydrides used in the production of polyamic acid include, for example, pyromellitic anhydride (PMDA), 4,4'-oxydiphthalic anhydride (ODPA), biphenyl-3,3 ',4,4'-tetracarboxylic anhydride (BPDA), benzophenone-3,3',4,4'-tetracarboxylic anhydride (BTDA), ethylene tetracarboxylic anhydride, butane tetracarboxylic anhydride, cyclo Pentane tetracarboxylic anhydride, benzophenone-2,2',3,3'-tetracarboxylic anhydride, biphenyl-2,2',3,3'-tetracarboxylic anhydride, 2,2-bis(3, 4-dicarboxyphenyl) propane anhydride, 2,2-bis(2,3-dicarboxyphenyl) propane anhydride, bis(3,4-dicarboxyphenyl) ether anhydride, bis(3,4-dicarboxy Phenyl)sulfone anhydride, 1,1-bis(2,3-dicarboxyphenyl)ethane anhydride, bis(2,3-dicarboxyphenyl)methane anhydride, bis(3,4-dicarboxyphenyl) Methane anhydride, 4,4'-(p-phenylenedioxy)diphthalic anhydride, 4,4'-(m-phenylenedioxy)diphthalic anhydride, naphthalene-2,3,6 ,7-tetracarboxylic anhydride, naphthalene-1,4,5,8-tetracarboxyl...
Embodiment
[0846] The present invention will be described more specifically by way of examples below. In addition, each characteristic value was calculated|required by the following method.
[0847] A. Melting point, stereocomplex crystallinity (S):
[0848] Using TA-2920 manufactured by TA Instruments Co., Ltd., the measurement was performed under the condition of a temperature increase rate of 20° C. / min, and the peak temperature of the obtained melting peak was defined as the melting point.
[0849] In addition, using TA-2920, in the first cycle, the sample was heated up to 250°C at 10°C / min under nitrogen flow, and the glass transition temperature (Tg), stereocomplex phase polylactic acid crystal melting temperature (Tm* ) and polylactic acid crystal fusion enthalpy of stereocomplex phase (ΔHm s ) and melting enthalpy of homogeneous polylactic acid crystals (ΔHm h ) to measure.
[0850] In addition, the crystallization initiation temperature (Tc*) and the crystallization temperat...
reference example 1
[0911] Add 0.005 parts by weight of tin octoate to 100 parts by weight of L-lactide (manufactured by Musashino Chemical Research Institute, optical purity 100%), and in a nitrogen atmosphere, in a reactor with a stirring blade, in After reacting at 180° C. for 2 hours, adding phosphoric acid equivalent to 1.2 times the catalyst deactivator relative to tin octoate, the residual lactide was removed at 13.3 Pa to form chips to obtain poly-L-lactic acid.
[0912] The obtained poly-L-lactic acid had a weight average molecular weight of 152,000, a glass transition temperature (Tg) of 55°C, and a melting point of 175°C. The carboxyl terminal concentration was 14eq / ton, and the reduction viscosity retention rate for hydrolysis was 9.5%.
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