Polymer Degradation and Stability

Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.

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Quartiles

The set of journals have been ranked according to their SJR and divided into four equal groups, four quartiles. Q1 (green) comprises the quarter of the journals with the highest values, Q2 (yellow) the second highest values, Q3 (orange) the third highest values and Q4 (red) the lowest values.

Category	Year	Quartile
Condensed Matter Physics	1999	Q2
Condensed Matter Physics	2000	Q2
Condensed Matter Physics	2001	Q1
Condensed Matter Physics	2002	Q2
Condensed Matter Physics	2003	Q2
Condensed Matter Physics	2004	Q1
Condensed Matter Physics	2005	Q1
Condensed Matter Physics	2006	Q1
Condensed Matter Physics	2007	Q1
Condensed Matter Physics	2008	Q1
Condensed Matter Physics	2009	Q1
Condensed Matter Physics	2010	Q1
Condensed Matter Physics	2011	Q1
Condensed Matter Physics	2012	Q1
Condensed Matter Physics	2013	Q1
Condensed Matter Physics	2014	Q1
Condensed Matter Physics	2015	Q1
Condensed Matter Physics	2016	Q1
Condensed Matter Physics	2017	Q1
Condensed Matter Physics	2018	Q1
Condensed Matter Physics	2019	Q1
Condensed Matter Physics	2020	Q1
Condensed Matter Physics	2021	Q1
Condensed Matter Physics	2022	Q1
Materials Chemistry	1999	Q2
Materials Chemistry	2000	Q2
Materials Chemistry	2001	Q1
Materials Chemistry	2002	Q1
Materials Chemistry	2003	Q1
Materials Chemistry	2004	Q1
Materials Chemistry	2005	Q1
Materials Chemistry	2006	Q1
Materials Chemistry	2007	Q1
Materials Chemistry	2008	Q1
Materials Chemistry	2009	Q1
Materials Chemistry	2010	Q1
Materials Chemistry	2011	Q1
Materials Chemistry	2012	Q1
Materials Chemistry	2013	Q1
Materials Chemistry	2014	Q1
Materials Chemistry	2015	Q1
Materials Chemistry	2016	Q1
Materials Chemistry	2017	Q1
Materials Chemistry	2018	Q1
Materials Chemistry	2019	Q1
Materials Chemistry	2020	Q1
Materials Chemistry	2021	Q1
Materials Chemistry	2022	Q1
Mechanics of Materials	1999	Q2
Mechanics of Materials	2000	Q2
Mechanics of Materials	2001	Q1
Mechanics of Materials	2002	Q1
Mechanics of Materials	2003	Q1
Mechanics of Materials	2004	Q1
Mechanics of Materials	2005	Q1
Mechanics of Materials	2006	Q1
Mechanics of Materials	2007	Q1
Mechanics of Materials	2008	Q1
Mechanics of Materials	2009	Q1
Mechanics of Materials	2010	Q1
Mechanics of Materials	2011	Q1
Mechanics of Materials	2012	Q1
Mechanics of Materials	2013	Q1
Mechanics of Materials	2014	Q1
Mechanics of Materials	2015	Q1
Mechanics of Materials	2016	Q1
Mechanics of Materials	2017	Q1
Mechanics of Materials	2018	Q1
Mechanics of Materials	2019	Q1
Mechanics of Materials	2020	Q1
Mechanics of Materials	2021	Q1
Mechanics of Materials	2022	Q1
Polymers and Plastics	1999	Q1
Polymers and Plastics	2000	Q1
Polymers and Plastics	2001	Q1
Polymers and Plastics	2002	Q1
Polymers and Plastics	2003	Q1
Polymers and Plastics	2004	Q1
Polymers and Plastics	2005	Q1
Polymers and Plastics	2006	Q1
Polymers and Plastics	2007	Q1
Polymers and Plastics	2008	Q1
Polymers and Plastics	2009	Q1
Polymers and Plastics	2010	Q1
Polymers and Plastics	2011	Q1
Polymers and Plastics	2012	Q1
Polymers and Plastics	2013	Q1
Polymers and Plastics	2014	Q1
Polymers and Plastics	2015	Q1
Polymers and Plastics	2016	Q1
Polymers and Plastics	2017	Q1
Polymers and Plastics	2018	Q1
Polymers and Plastics	2019	Q1
Polymers and Plastics	2020	Q1
Polymers and Plastics	2021	Q1
Polymers and Plastics	2022	Q1

SJR

The SJR is a size-independent prestige indicator that ranks journals by their 'average prestige per article'. It is based on the idea that 'all citations are not created equal'. SJR is a measure of scientific influence of journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from It measures the scientific influence of the average article in a journal, it expresses how central to the global scientific discussion an average article of the journal is.

Year	SJR
1999	0.737
2000	0.665
2001	0.975
2002	0.841
2003	0.934
2004	1.064
2005	1.226
2006	1.380
2007	1.452
2008	1.284
2009	1.345
2010	1.245
2011	1.346
2012	1.411
2013	1.336
2014	1.282
2015	1.209
2016	1.056
2017	1.041
2018	1.041
2019	0.928
2020	0.925
2021	0.894
2022	0.941

Total Documents

Evolution of the number of published documents. All types of documents are considered, including citable and non citable documents.

Year	Documents
1999	258
2000	246
2001	233
2002	244
2003	253
2004	265
2005	271
2006	403
2007	263
2008	283
2009	290
2010	345
2011	286
2012	318
2013	333
2014	355
2015	293
2016	326
2017	282
2018	293
2019	312
2020	296
2021	266
2022	335

Citations per document

This indicator counts the number of citations received by documents from a journal and divides them by the total number of documents published in that journal. The chart shows the evolution of the average number of times documents published in a journal in the past two, three and four years have been cited in the current year. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

Cites per document	Year	Value
Cites / Doc. (4 years)	1999	0.803
Cites / Doc. (4 years)	2000	1.021
Cites / Doc. (4 years)	2001	1.206
Cites / Doc. (4 years)	2002	1.292
Cites / Doc. (4 years)	2003	1.480
Cites / Doc. (4 years)	2004	1.822
Cites / Doc. (4 years)	2005	2.070
Cites / Doc. (4 years)	2006	2.833
Cites / Doc. (4 years)	2007	2.664
Cites / Doc. (4 years)	2008	3.052
Cites / Doc. (4 years)	2009	3.130
Cites / Doc. (4 years)	2010	3.314
Cites / Doc. (4 years)	2011	3.671
Cites / Doc. (4 years)	2012	3.893
Cites / Doc. (4 years)	2013	4.006
Cites / Doc. (4 years)	2014	4.120
Cites / Doc. (4 years)	2015	3.932
Cites / Doc. (4 years)	2016	4.100
Cites / Doc. (4 years)	2017	4.036
Cites / Doc. (4 years)	2018	4.330
Cites / Doc. (4 years)	2019	4.730
Cites / Doc. (4 years)	2020	4.994
Cites / Doc. (4 years)	2021	5.204
Cites / Doc. (4 years)	2022	6.344
Cites / Doc. (3 years)	1999	0.803
Cites / Doc. (3 years)	2000	0.999
Cites / Doc. (3 years)	2001	1.213
Cites / Doc. (3 years)	2002	1.171
Cites / Doc. (3 years)	2003	1.509
Cites / Doc. (3 years)	2004	1.858
Cites / Doc. (3 years)	2005	2.152
Cites / Doc. (3 years)	2006	2.826
Cites / Doc. (3 years)	2007	2.521
Cites / Doc. (3 years)	2008	2.962
Cites / Doc. (3 years)	2009	2.878
Cites / Doc. (3 years)	2010	3.115
Cites / Doc. (3 years)	2011	3.607
Cites / Doc. (3 years)	2012	3.725
Cites / Doc. (3 years)	2013	3.685
Cites / Doc. (3 years)	2014	3.788
Cites / Doc. (3 years)	2015	3.875
Cites / Doc. (3 years)	2016	3.886
Cites / Doc. (3 years)	2017	3.873
Cites / Doc. (3 years)	2018	4.245
Cites / Doc. (3 years)	2019	4.623
Cites / Doc. (3 years)	2020	4.822
Cites / Doc. (3 years)	2021	5.215
Cites / Doc. (3 years)	2022	6.276
Cites / Doc. (2 years)	1999	0.647
Cites / Doc. (2 years)	2000	0.996
Cites / Doc. (2 years)	2001	1.105
Cites / Doc. (2 years)	2002	1.232
Cites / Doc. (2 years)	2003	1.419
Cites / Doc. (2 years)	2004	1.932
Cites / Doc. (2 years)	2005	2.012
Cites / Doc. (2 years)	2006	2.524
Cites / Doc. (2 years)	2007	2.374
Cites / Doc. (2 years)	2008	2.652
Cites / Doc. (2 years)	2009	2.520
Cites / Doc. (2 years)	2010	3.019
Cites / Doc. (2 years)	2011	3.312
Cites / Doc. (2 years)	2012	3.268
Cites / Doc. (2 years)	2013	3.136
Cites / Doc. (2 years)	2014	3.590
Cites / Doc. (2 years)	2015	3.525
Cites / Doc. (2 years)	2016	3.631
Cites / Doc. (2 years)	2017	3.549
Cites / Doc. (2 years)	2018	4.056
Cites / Doc. (2 years)	2019	4.348
Cites / Doc. (2 years)	2020	4.765
Cites / Doc. (2 years)	2021	4.980
Cites / Doc. (2 years)	2022	6.137

Total Cites

Self-Cites

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.
Journal Self-citation is defined as the number of citation from a journal citing article to articles published by the same journal.

Cites	Year	Value
Self Cites	1999	166
Self Cites	2000	197
Self Cites	2001	193
Self Cites	2002	249
Self Cites	2003	332
Self Cites	2004	299
Self Cites	2005	306
Self Cites	2006	516
Self Cites	2007	389
Self Cites	2008	384
Self Cites	2009	379
Self Cites	2010	372
Self Cites	2011	370
Self Cites	2012	406
Self Cites	2013	433
Self Cites	2014	470
Self Cites	2015	481
Self Cites	2016	526
Self Cites	2017	474
Self Cites	2018	406
Self Cites	2019	402
Self Cites	2020	360
Self Cites	2021	347
Self Cites	2022	484
Total Cites	1999	481
Total Cites	2000	679
Total Cites	2001	921
Total Cites	2002	863
Total Cites	2003	1091
Total Cites	2004	1356
Total Cites	2005	1640
Total Cites	2006	2230
Total Cites	2007	2367
Total Cites	2008	2775
Total Cites	2009	2731
Total Cites	2010	2604
Total Cites	2011	3311
Total Cites	2012	3431
Total Cites	2013	3497
Total Cites	2014	3549
Total Cites	2015	3898
Total Cites	2016	3812
Total Cites	2017	3772
Total Cites	2018	3825
Total Cites	2019	4165
Total Cites	2020	4277
Total Cites	2021	4699
Total Cites	2022	5485

External Cites per Doc

Cites per Doc

Evolution of the number of total citation per document and external citation per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years. External citations are calculated by subtracting the number of self-citations from the total number of citations received by the journal’s documents.

Cites	Year	Value
External Cites per document	1999	0.528
External Cites per document	2000	0.710
External Cites per document	2001	0.960
External Cites per document	2002	0.835
External Cites per document	2003	1.053
External Cites per document	2004	1.452
External Cites per document	2005	1.760
External Cites per document	2006	2.189
External Cites per document	2007	2.122
External Cites per document	2008	2.563
External Cites per document	2009	2.489
External Cites per document	2010	2.679
External Cites per document	2011	3.221
External Cites per document	2012	3.299
External Cites per document	2013	3.253
External Cites per document	2014	3.311
External Cites per document	2015	3.427
External Cites per document	2016	3.374
External Cites per document	2017	3.407
External Cites per document	2018	3.812
External Cites per document	2019	4.190
External Cites per document	2020	4.431
External Cites per document	2021	4.841
External Cites per document	2022	5.755
Cites per document	1999	0.803
Cites per document	2000	0.999
Cites per document	2001	1.213
Cites per document	2002	1.171
Cites per document	2003	1.509
Cites per document	2004	1.858
Cites per document	2005	2.152
Cites per document	2006	2.826
Cites per document	2007	2.521
Cites per document	2008	2.962
Cites per document	2009	2.878
Cites per document	2010	3.115
Cites per document	2011	3.607
Cites per document	2012	3.725
Cites per document	2013	3.685
Cites per document	2014	3.788
Cites per document	2015	3.875
Cites per document	2016	3.886
Cites per document	2017	3.873
Cites per document	2018	4.245
Cites per document	2019	4.623
Cites per document	2020	4.822
Cites per document	2021	5.215
Cites per document	2022	6.276

% International Collaboration

International Collaboration accounts for the articles that have been produced by researchers from several countries. The chart shows the ratio of a journal's documents signed by researchers from more than one country; that is including more than one country address.

Year	International Collaboration
1999	16.67
2000	16.67
2001	21.03
2002	18.03
2003	24.90
2004	19.62
2005	15.50
2006	17.12
2007	16.35
2008	16.25
2009	19.31
2010	22.61
2011	19.58
2012	22.01
2013	22.22
2014	24.51
2015	21.50
2016	21.78
2017	20.92
2018	20.48
2019	19.23
2020	15.20
2021	15.04
2022	19.70

Citable documents

Non-citable documents

Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.

Documents	Year	Value
Non-citable documents	1999	2
Non-citable documents	2000	1
Non-citable documents	2001	1
Non-citable documents	2002	2
Non-citable documents	2003	2
Non-citable documents	2004	2
Non-citable documents	2005	4
Non-citable documents	2006	6
Non-citable documents	2007	7
Non-citable documents	2008	4
Non-citable documents	2009	4
Non-citable documents	2010	3
Non-citable documents	2011	5
Non-citable documents	2012	4
Non-citable documents	2013	7
Non-citable documents	2014	7
Non-citable documents	2015	9
Non-citable documents	2016	7
Non-citable documents	2017	6
Non-citable documents	2018	4
Non-citable documents	2019	3
Non-citable documents	2020	3
Non-citable documents	2021	2
Non-citable documents	2022	5
Citable documents	1999	597
Citable documents	2000	679
Citable documents	2001	758
Citable documents	2002	735
Citable documents	2003	721
Citable documents	2004	728
Citable documents	2005	758
Citable documents	2006	783
Citable documents	2007	932
Citable documents	2008	933
Citable documents	2009	945
Citable documents	2010	833
Citable documents	2011	913
Citable documents	2012	917
Citable documents	2013	942
Citable documents	2014	930
Citable documents	2015	997
Citable documents	2016	974
Citable documents	2017	968
Citable documents	2018	897
Citable documents	2019	898
Citable documents	2020	884
Citable documents	2021	899
Citable documents	2022	869

Cited documents

Uncited documents

Ratio of a journal's items, grouped in three years windows, that have been cited at least once vs. those not cited during the following year.

Documents	Year	Value
Uncited documents	1999	341
Uncited documents	2000	331
Uncited documents	2001	342
Uncited documents	2002	305
Uncited documents	2003	255
Uncited documents	2004	209
Uncited documents	2005	215
Uncited documents	2006	174
Uncited documents	2007	212
Uncited documents	2008	180
Uncited documents	2009	176
Uncited documents	2010	157
Uncited documents	2011	140
Uncited documents	2012	136
Uncited documents	2013	144
Uncited documents	2014	140
Uncited documents	2015	134
Uncited documents	2016	121
Uncited documents	2017	114
Uncited documents	2018	96
Uncited documents	2019	88
Uncited documents	2020	91
Uncited documents	2021	84
Uncited documents	2022	57
Cited documents	1999	258
Cited documents	2000	349
Cited documents	2001	417
Cited documents	2002	432
Cited documents	2003	468
Cited documents	2004	521
Cited documents	2005	547
Cited documents	2006	615
Cited documents	2007	727
Cited documents	2008	757
Cited documents	2009	773
Cited documents	2010	679
Cited documents	2011	778
Cited documents	2012	785
Cited documents	2013	805
Cited documents	2014	797
Cited documents	2015	872
Cited documents	2016	860
Cited documents	2017	860
Cited documents	2018	805
Cited documents	2019	813
Cited documents	2020	796
Cited documents	2021	817
Cited documents	2022	817