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'Formulations': [28], 'with': [29, 62, 163, 187], 'varying': [30], 'isocyanate': [31, 101, 140], 'index': [32, 102, 178], '(FI)': [33], 'NCO': [35, 98, 137, 175], 'number': [36, 99, 138, 176], 'were': [37], 'prepared.': [38], 'At': [39], '0.5': [40], 'wt.%,': [41], "SEM's": [42], 'of': [43, 73, 81, 87, 90, 107, 129, 157, 184, 191], 'the': [44, 49, 74, 79, 88, 105, 108, 111, 121, 142, 146, 158, 170, 182], 'fractured': [45], 'surface': [46], 'underlined': [47], 'that': [48, 172], 'CNC': [50, 82, 109, 143, 159], 'acted': [51], 'both': [52, 180], 'as': [53, 58, 116], 'nucleation': [55], 'agent': [56], 'particulate': [60], 'surfactant': [61], 'cell': [63], 'geometries': [64], 'apparent': [66], 'density': [67], 'changing': [68], 'selectively.': [69], 'The': [70, 155], 'chemical': [71], 'structure': [72], 'PUF': [75], '(FTIR)': [76], 'changed': [77], 'after': [78], 'incorporation': [80], 'relative': [85], 'change': [86], 'amount': [89], 'urea,': [91], 'urethane': [92, 192], 'isocyanurate': [94], 'groups.': [95, 193], 'A': [96], 'low': [97, 174], 'contributed': [103, 179], 'migration': [106, 156], 'Hard': [112], 'Segment': [113, 148], '(HS),': [114], 'acting': [115], 'reinforcement': [117, 153], 'improving': [119], 'substantially': [120], 'compressive': [122], 'mechanical': [123], 'properties': [124], '(Ec': [125], 'σc': [127], 'improvements': [128], '63': [130], '50%,': [132], 'respectively).': [133], 'For': [134], 'high': [136], 'or': [139], 'index,': [141], 'migrated': [144], 'Soft': [147], '(SS),': [149], 'without': [150], 'causing': [151], 'effect.': [154], 'also': [161], 'detected': [162], 'DSC,': [164], 'TGA': [165], 'DMA,': [167], 'furtherly': [168], 'supporting': [169], 'hypothesis': [171], 'formation': [183], 'microstructure': [186], 'higher': [189], 'content': [190]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W971530551', 'counts_by_year': [{'year': 2024, 'cited_by_count': 5}, {'year': 2023, 'cited_by_count': 5}, {'year': 2022, 'cited_by_count': 6}, {'year': 2021, 'cited_by_count': 6}, {'year': 2020, 'cited_by_count': 6}, {'year': 2019, 'cited_by_count': 7}, {'year': 2018, 'cited_by_count': 3}, {'year': 2017, 'cited_by_count': 6}, {'year': 2016, 'cited_by_count': 6}], 'updated_date': '2024-09-10T07:07:48.895423', 'created_date': '2016-06-24'}