High-Tg PLA copolymers via base-catalyzed transesterification of PLA with 2,5,7-trioxabicyclo[2.2.2]octan-6-one
Zhou, Tong; Guo, Yu-Ting; Yang, Chun; Meng, Xian-Bin; Du, Fu-Sheng; Li, Zi-Chen; Polymer Chemistry 15 (2024) 156–165; doi:10.1039/D3PY01250F

data_1570472
_publ_section_title
;
 High-Tg PLA copolymers via base-catalyzed transesterification of PLA with
 2,5,7-trioxabicyclo[2.2.2]octan-6-one
;
_journal_issue                   3
_journal_name_full               'Polymer Chemistry'
_journal_page_first              156
_journal_page_last               165
_journal_paper_doi               10.1039/D3PY01250F
_journal_volume                  15
_journal_year                    2024
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C6 H8 O4'
_chemical_formula_sum            'C6 H8 O4'
_chemical_formula_weight         144.12
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2022-10-31 deposited with the CCDC.	2023-11-23 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.61470(10)
_cell_length_b                   8.8811(2)
_cell_length_c                   11.0758(2)
_cell_measurement_reflns_used    6965
_cell_measurement_temperature    100.00(11)
_cell_measurement_theta_max      75.3460
_cell_measurement_theta_min      6.3660
_cell_volume                     650.66(2)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      100.00(11)
_diffrn_detector                 'CCD plate'
_diffrn_detector_type            HyPix
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'XtaLAB Synergy R, DW system, HyPix'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0393
_diffrn_reflns_av_unetI/netI     0.0166
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.988
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            12322
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.979
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         75.435
_diffrn_reflns_theta_min         6.388
_diffrn_source                   'fine-focus sealed X-ray tube'
_diffrn_source_type              'Enhance Ultra (Cu) X-ray Source'
_exptl_absorpt_coefficient_mu    1.082
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.87147
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.39.29a (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.471
_exptl_crystal_description       rod-like
_exptl_crystal_F_000             304
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.149
_refine_diff_density_min         -0.166
_refine_diff_density_rms         0.035
_refine_ls_abs_structure_details
;
 Flack x determined using 490 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.11(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.038
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     92
_refine_ls_number_reflns         1315
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0271
_refine_ls_R_factor_gt           0.0254
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0296P)^2^+0.1532P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0606
_refine_ls_wR_factor_ref         0.0613
_reflns_Friedel_coverage         0.654
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.967
_reflns_number_gt                1278
_reflns_number_total             1315
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d3py01250f2.cif
_cod_data_source_block           3_CCDC2
_cod_depositor_comments
'Adding full bibliography for 1570470--1570474.cif.'
_cod_database_code               1570472
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              10736